Log in

Relevant bibliographies by topics / Bromide complexes / Journal articles

To see the other types of publications on this topic, follow the link: Bromide complexes.

Journal articles on the topic 'Bromide complexes'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Bromide complexes.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Jahnke, Mareike C., and F. Ekkehardt Hahn. "Synthesis and coordination chemistry of silver(I), gold(I) and gold(III) complexes with picoline-functionalized benzimidazolin-2-ylidene ligands." Zeitschrift für Naturforschung B 76, no. 8 (2021): 463–73. http://dx.doi.org/10.1515/znb-2021-0087.

Full text

Abstract:

Abstract The reactions of N-alkyl-N′-picolyl-benzimidazolium bromides or N,N′-dipicolyl-benzimidazolium bromide with silver oxide yielded the silver dicarbene complexes of the type [Ag(NHC)2][AgBr2] 1–4 (NHC = picoline-functionalized benzimidazolin-2-ylidene). The silver complexes 1–4 have been used in carbene transfer reactions to yield the gold(I) complexes of the type [AuCl(NHC)] 5–8 in good yields. A halide exchange at the metal center of complexes 5–8 with lithium bromide yielded the gold bromide complexes 9–12. Finally, the oxidation of the gold(I) centers in complexes 9–12 with elemental bromine gave the gold(III) complexes of the type [AuBr3(NHC)] 13–16. Molecular structures of selected Au(I) and Au(III) complexes have been determined by X-ray diffraction studies.

APA, Harvard, Vancouver, ISO, and other styles

2

Hahn, F. Ekkehardt, Beate Heidrich, Thomas Lügger, and Tania Pape. "Pd(II) Complexes of N-Allyl Substituted N-Heterocyclic Carbenes." Zeitschrift für Naturforschung B 59, no. 11-12 (2004): 1519–23. http://dx.doi.org/10.1515/znb-2004-11-1223.

Full text

Abstract:

The unsymmetrically substituted imidazolium salt 1-ethyl-3-allyl-imidazolium bromide 1 was synthesized by treatment of imidazole with one equivalent each of n-butyl lithium and ethyl bromide followed by treatment with one equivalent of allyl bromide. The symmetrically substituted derivatives 1,3-diallyl-imidazolium bromide 2 and 1,3-bis(3-methyl-2-butenyl)-imidazolium bromide 3 were obtained from imidazole and two equivalents of allyl bromide or 4-bromo-2-methyl-2-butenyl bromide, respectively, in the presence of sodium hydrogencarbonate as a base. The imidazolium bromides 1- 3 react with Pd(OAc)2 to afford the palladium(II) dicarbene complexes trans-[PdBr2(L)2] (L = 1- ethyl-3-allyl-imidazolin-2-ylidene, 4; L = 1,3-diallyl-imidazolin-2-ylidene, 5; L = 1,3-di(3-methyl-2- butenyl)imidazolin-2-ylidene, 6) by in situ deprotonation of the imidazolium salts. The X-ray structure analyses of 4- 6 show all three complexes to be mononuclear with palladium(II) coordinated in a square-planar fashion by two carbene and two bromo ligands.

APA, Harvard, Vancouver, ISO, and other styles

3

Au, Richard H. W., Lisa J. Findlay-Shirras, Neil M. Woody, Michael C. Jennings, and Richard J. Puddephatt. "Organoplatinum(IV) complexes with functional alkyl groups and their use in supramolecular chemistry." Canadian Journal of Chemistry 87, no. 7 (2009): 904–16. http://dx.doi.org/10.1139/v09-031.

Full text

Abstract:

The oxidative addition of alkyl bromides RCH2Br (R = C5H4N, C6H4CN, CH2C6H4CO2H, or CH2C6H4CH2CO2H) to dimethylplatinum(II) complexes [PtMe2(LL)] (LL = diimine ligand) gives the corresponding organoplatinum(IV) complexes [PtBrMe2(CH2R)(LL)] containing functionality in the alkyl group RCH2. The pyridyl derivatives can be protonated, while abstraction of the bromide ligand from [PtBrMe2(CH2R)(LL)] can form cationic complexes, which can react with water or form oligomers by self-assembly.

APA, Harvard, Vancouver, ISO, and other styles

4

Kuznetsov, Sergey A., and Marcelle Gaune-Escard. "Unusual Influence of the Temperature on the Standard Rate Constants of Charge Transfer for the Eu(III)/Eu(II) Redox Couple in Chloride-Bromide Melts." Zeitschrift für Naturforschung A 62, no. 7-8 (2007): 445–51. http://dx.doi.org/10.1515/zna-2007-7-815.

Full text

Abstract:

The influence of bromide ions and temperature on the standard rate constants of the Eu(III)/Eu(II) redox reaction was determined. Cyclic voltammetry was used for the calculation of the kinetic parameters. It was shown that in NaCl-KCl (equimolar mixture)-NaBr (15 wt%)-EuCl3 melts increase of the temperature from 973 K up to 1023 K leads to a drastical decrease of the standard rate constant ks for the Eu(III)/Eu(II) redox reaction. This unusual influence of the temperature on the ks value was explained by a change of the electron transfer mechanism. It is suggested that at 1023 K another mechanism becomes dominant - the transfer of electrons through dissolved bromine in the melt. Bromine appeared in the melt due to the decomposition of chloride-bromide or bromide complexes of Eu(III), and the concentration of bromine in the melt increased with the growth of temperature.

APA, Harvard, Vancouver, ISO, and other styles

5

Ramaprabhu, Sundara, and Edwin A. C. Lücken. "63,65Cu and 79 81Br NQR Studies of Thione Complexes of Cu(I) Halides." Zeitschrift für Naturforschung A 47, no. 1-2 (1992): 125–28. http://dx.doi.org/10.1515/zna-1992-1-222.

Full text

Abstract:

Abstract63, 65Cu NQR frequencies, together with their temperature dependence, are reported for several complexes formed between cuprous chloride or bromide and heterocyclic thiones. For bromides the 79,81Br resonances have also been detected. These results indicate that, with one exception, the copper atom is tricoordinated by two sulphur atoms and one halogen. Several of these complexes show phase changes in the range 77-300 K.

APA, Harvard, Vancouver, ISO, and other styles

6

Pesek, Joseph J., Sabrina M. Ronen, and Armando Alcaraz. "The Study of Ternary Metal-Protein-Ligand Complexes Using Bromine-81 Magnetic Resonance." Applied Spectroscopy 41, no. 5 (1987): 865–69. http://dx.doi.org/10.1366/0003702874448238.

Full text

Abstract:

Bromine-81 magnetic resonance is used to detect the formation of ternary metal-protein-ligand complexes. Mercury is the metal; EDTA and lysine are the ligands; and acid phosphatase, α-chymotrypsinogen, and peroxidase are the proteins which are studied. The halide-ion probe method permits the determinations of the local correlation time and the bromide-ion exchange rate at the metal binding site. The local correlation time becomes longer as additional mass in the form of the ligand is added to the protein segment containing the metal binding site. The bromide-ion exchange rate increases upon formation of the ternary complex, which is consistent with the pattern of hetero-substitution in bromomercury (II) species. The major factors controlling the bromide-ion exchange rate appear to be steric.

APA, Harvard, Vancouver, ISO, and other styles

7

Cakmak, M., I. I. Ozturk, C. N. Banti, et al. "Bismuth(III) bromide-thioamide complexes: synthesis, characterization and cytotoxic properties." Main Group Metal Chemistry 41, no. 5-6 (2018): 143–54. http://dx.doi.org/10.1515/mgmc-2018-0035.

Full text

Abstract:

Abstract New bismuth(III) bromine compounds of the heterocyclic thioamides were prepared and structurally characterized. The reaction of heterocyclic thioamides with bismuth(III) bromide resulted in the formation of the {[BiBr2(μ2-Br)(MMI)2]2·CH3COCH3·H2O} (1), {[BiBr2(MBZIM)4]·Br·2H2O} (2), {[BiBr2(μ2-Br)(tHPMT)2]2·CH3CN} (3), {[BiBr2(μ2-Br)(PYT)2]2·CH3CN} (4) and {[BiBr2(μ2-Br)(MBZT)2]2 2CH3OH} (5) complexes (MMI: 2-mercapto-1-methylimidazole, MBZIM: 2-mercaptobenzimidazole, tHPMT: 2-mercapto-3,4,5,6-tetrahydro-pyrimidine, PYT: 2-mercaptopyridine and MBZT: 2-mercaptobenzothiazole). The complexes 1–5 were characterized by melting point (m.p.), elemental analysis (e.a.), molar conductivity, Fourier-transform infrared (FT-IR), Fourier-transform Raman (FT-Raman), nuclear magnetic resonance (1H and 13CNMR) spectroscopy, UV-Vis spectroscopy and thermogravimetric-differential thermal analysis (TG-DTA). The molecular structures of 1–5 were determined by single-crystal X-ray diffraction. Complex 2 is a first ionic monomuclear octahedral bismuth(III) bromide, while the complexes 1, 3–5 are the first examples of dinuclear bismuth(III) bromide derivatives. Complexes 1–5 were evaluated in terms of their in vitro cytotoxic activity against human adenocarcinoma breast (MCF-7) and cervix (HeLa) cells. The toxicity on normal human fetal lung fibroblast cells (MRC-5) was also evaluated. Moreover, the complexes 1–5 and free heterocyclic thioamide ligands were studied upon the catalytic peroxidation of the linoleic acid by the enzyme lipoxygenase (LOX).

APA, Harvard, Vancouver, ISO, and other styles

8

R., K. AGARWAL, and KUMAR PRAVESH. "Synthesis and Characterisation of Dibenzyl Sulphoxide Adducts with Lanthanide(III) Bromide and Nitrate." Journal of Indian Chemical Society Vol. 65, Jun 1988 (1988): 450–51. https://doi.org/10.5281/zenodo.6303527.

Full text

Abstract:

Department of Chemistry, Lajpat Rai (Post-Graduate) College, Sahibabad-201 005 <em>Manuscript received </em><em>21 December 1987, </em><em>revised </em><em>24 </em><em>March </em><em>1988, </em><em>accepted 6 April </em><em>1988</em> Synthesis and Characterisation of Dibenzyl Sulphoxide Adducts with Lanthanide(III) Bromide and Nitrate.

APA, Harvard, Vancouver, ISO, and other styles

9

Chin, Sang-Hyun, Jin Woo Choi, Ziqi Hu, Lorenzo Mardegan, Michele Sessolo, and Henk J. Bolink. "Tunable luminescent lead bromide complexes." Journal of Materials Chemistry C 8, no. 45 (2020): 15996–6000. http://dx.doi.org/10.1039/d0tc04057f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Heumen, Jeff Van, Toru Ozeki, and Donald E. Irish. "A Raman spectral study of the equilibria of zinc bromide complexes in DMSO solutions." Canadian Journal of Chemistry 67, no. 11 (1989): 2030–36. http://dx.doi.org/10.1139/v89-314.

Full text

Abstract:

Using Raman spectroscopy, the stepwise formation of zinc bromide complexes in dimethylsulfoxide (DMSO) solution has been investigated. The presence of four different zinc bromide complexes is suggested and their Raman spectra have been extracted. The formation constant of each reaction has been estimated by the application of factor analysis to the spectra. The usual methods of factor analysis have been extended by the introduction of constraints imposed by the equilibria. Keywords: zinc bromide complexes, solvation in DMSO, Raman spectroscopy, factor analysis.

APA, Harvard, Vancouver, ISO, and other styles

11

Albertsson, J., and C. Svensson. "Solid-stateN-bromosuccinimide–bromide complexes." Acta Crystallographica Section A Foundations of Crystallography 43, a1 (1987): C69. http://dx.doi.org/10.1107/s0108767387083648.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Lah, N., P. Segedin, M. Jacimović, and I. Leban. "Copper-imidazole-chloride/bromide complexes." Acta Crystallographica Section A Foundations of Crystallography 61, a1 (2005): c300. http://dx.doi.org/10.1107/s0108767305087192.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Neal, M., C. Neal, H. Wickham, and S. Harman. "Determination of bromide, chloride, fluoride, nitrate and sulphate by ion chromatography: comparisons of methodologies for rainfall, cloud water and river waters at the Plynlimon catchments of mid-Wales." Hydrology and Earth System Sciences 11, no. 1 (2007): 294–300. http://dx.doi.org/10.5194/hess-11-294-2007.

Full text

Abstract:

Abstract. The results of determination of bromide, chloride, fluoride, nitrate and sulphate using ion chromatography (IC) are compared with those obtained by colorimetric and inductively coupled plasma optical emission spectroscopy (ICPOES) for rainfall, cloud water and stream waters in the Plynlimon experimental catchments of mid-Wales. For bromide, the concentrations determined by IC are lower than those for the colorimetric method used; the colorimetric method probably determined bromide plus organo-bromine compounds. It is suggested that the values determined by the colorimetric method be termed dissolved labile bromine (DLBr). The study shows that sulphate is the overriding form of sulphur in the waters. For chloride and nitrate, measurements by both methods approach a 1:1 relationship that is barely statistically significantly different from unity. For fluoride, the IC method gives lower values than the colorimetric, especially for the stream waters. However, the colorimetric method determines total fluorine so that a difference is to be expected (for example, fluoride strongly complexes with aluminium that is present, especially in the streamwater).

APA, Harvard, Vancouver, ISO, and other styles

14

Emmenegger, F. P., and R. Rengier. "Stability of transition metal bromide-aluminium bromide complexes in cyclohexane." Journal of the Less Common Metals 137, no. 1-2 (1988): 35–41. http://dx.doi.org/10.1016/0022-5088(88)90073-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Jandl, C., S. Stegbauer та A. Pöthig. "A halide-free pyridinium-substituted η3-cycloheptatrienide–Pd complex". Acta Crystallographica Section C Structural Chemistry 73, № 9 (2017): 754–59. http://dx.doi.org/10.1107/s2053229617012244.

Full text

Abstract:

We report the synthesis and characterization of a novel 4-(dimethylamino)pyridinium-substituted η3-cycloheptatrienide–Pd complex which is free of halide ligands. Diacetonitrile{η3-[4-(dimethylamino)pyridinium-1-yl]cycloheptatrienido}palladium(II) bis(tetrafluoroborate), [Pd(C2H3N)2(C14H16N2)](BF4)2, was prepared by the exchange of two bromide ligands for noncoordinating anions, which results in the empty coordination sites being occupied by acetonitrile ligands. As described previously, exchange of only one bromide leads to a dimeric complex, di-μ-bromido-bis({η3-[4-(dimethylamino)pyridinium-1-yl]cycloheptatrienido}palladium(II)) bis(tetrafluoroborate) acetonitrile disolvate, [Pd2Br2(C14H16N2)2](BF4)2·2CH3CN, with bridging bromide ligands, and the crystal structure of this compound is also reported here. The structures of the cycloheptatrienide ligands of both complexes are analogous to the dibromide derivative, showing the allyl bond in the β-position with respect to the pyridinium substituent. This indicates that, unlike a previous interpretation, the main reason for the formation of the β-isomer cannot be internal hydrogen bonding between the cationic substituents and bromide ligands.

APA, Harvard, Vancouver, ISO, and other styles

16

Liu, Hui, Tong Tong, Yingying Pu, Bing Sun, Xiaomei Zhu, and Zhiyu Yan. "Insight Into the Formation Paths of Methyl Bromide From Syringic Acid in Aqueous Bromide Solutions Under Simulated Sunlight Irradiation." International Journal of Environmental Research and Public Health 17, no. 6 (2020): 2081. http://dx.doi.org/10.3390/ijerph17062081.

Full text

Abstract:

Methyl bromide (CH3Br) is one of the largest natural sources of bromine in the stratosphere, where it leads to ozone depletion. This paper reported the photochemical production of CH3Br from syringic acid (SA) that has been used as an environmentally relevant model compound for terrestrially-derived dissolved organic matter. The formation of CH3Br increased with the increase of bromide ion concentration ranging from 0.8 to 80 mmol L−1. Ferric ions (Fe(III)) enhanced CH3Br production, while chloride inhibited it, with or without Fe(III). Meanwhile, methyl chloride (CH3Cl) was generated in the presence of chloride and was inhibited by Fe(III). The different effects of Fe(III) on the formation of CH3Cl and CH3Br indicate their diverse formation paths. Based on the intermediates identified by liquid chromatography-mass spectrometry and the confirmation of the formation of Fe(III)-SA complexes, it was proposed that there were two formation paths of CH3Br from SA in the bromide-enriched water under simulated sunlight irradiation. One path was via nucleophilic attack of Br− on the excited state protonation of SA; the other was via the combination of methyl radical and bromine radical when Fe(III) was present. This work suggests that the photochemical formation of CH3Br may act as a potential natural source of CH3Br in the bromide-enriched environmental matrix, and helps in better understanding the formation mechanism of CH3Br.

APA, Harvard, Vancouver, ISO, and other styles

17

Hasson, Mohammed Mujbel, Basim H. Al-Zaidi, and Ahmad H. Ismail. "Synthesis and Characterization of Ag(I) Complexes Derived from New N-Heterocyclic Carbenes." Asian Journal of Chemistry 31, no. 5 (2019): 1149–52. http://dx.doi.org/10.14233/ajchem.2019.21877.

Full text

Abstract:

Two new unsymmetrical imidazolium salts viz., [1-(4-ethylphenyl)-3-propyl-1H-imidazole-3-ium bromide] (3) and [1-(2,6-dimethylphenyl)-3-propyl-1H-imidazole-3-ium bromide] (4) have been synthesized via the reaction of propyl bromide with imidazole derivatives, [1-(4-ethylphenyl)-1Himidazole] (1) and [1-(2,6-dimethylphenyl)-1H-imidazole] (2) in absence of solvent. Then two new N-heterocyclic carbene silver complexes (5 and 6) were prepared through the reaction of imidazoluim salts (3 and 4) as a source of N-heterocyclic carbene with Ag2O by in situ method. These complexes can be used in the future as a transfer agent for preparing other transitional metal carbine complexes (NHCs) via transmetallation method. The formation of these compounds was confirmed by spectral analysis.

APA, Harvard, Vancouver, ISO, and other styles

18

Masters, A. P., M. Parvez, T. S. Sorensen та F. Sun. "Organometallic products from the reaction of the isoelectronic Mn(CO)5− and Cr(CO)4NO− metallate anions with bis-α-bromocyclopropyl ketone". Canadian Journal of Chemistry 71, № 2 (1993): 230–38. http://dx.doi.org/10.1139/v93-034.

Full text

Abstract:

Mn(CO)5− and Cr(CO)4NO− react with the title ketone to give organometallic products. In the chromium case, a single metallofuran product is produced. In the manganese reaction, one can isolate a series of four complexes, two of which have a structure closely related to the chromium complex. The other two complexes are assigned an acyl manganese structure. The structures of the chromium complex and one of the acyl manganese complexes have been determined by X-ray methods. One finds a distorted octahedral bonding about the metal atom in each case. The chromium complex has bond lengths very similar to those reported for a closely related manganese structure, implying a delocalization of electrons within a metallofuran ring. As expected for this mixed carbonyl nitrosyl complex, the nitrosyl group is positioned trans to the oxide bond, representing the weakest and strongest "trans-effect" substituents. The acyl manganese structures contain an Mn(CO)4 unit in contrast to the usual Mn(CO)5 acyl complexes, with the 18e− count being provided by an internal chelation with the n-electrons of the dicyclopropyl ketone group. The reaction mechanism for the formation of the complexes is postulated to involve initial bromine abstraction (two-electron reduction) by the metallate anion, with the Cr(CO)4NO− reaction being much faster compared to Mn(CO)5−. The resulting organic enolate then "back-reacts" with a carbonyl group of the just-formed metal carbonyl bromide to form a transient anionic Fischer carbene complex. Ultimately this intermediate loses the metal bromide ion with the formation of the neutral complexes.

APA, Harvard, Vancouver, ISO, and other styles

19

Ball, Joanne M., P. Michael Boorman та Kelly J. Moynihan. "Reactions of confacial bioctahedral ditungsten(III) species: Product distribution in reactions of the μ-hydrido-(bis-μ-dimethylsulfide)bis (trichlorotungstate(III)) ion, and trichlorotungsten(III)(μ-hydrido)bis((μ-dimethylsulfide)(dimethylsulfide)-dichlorotungsten(III) with benzyl bromide and bromide ion". Canadian Journal of Chemistry 68, № 5 (1990): 685–90. http://dx.doi.org/10.1139/v90-105.

Full text

Abstract:

Reactions of compound Cl3W(μ-H)(μ-Me2S)2WCl2(Me2S), 1, and salts of derived chloro anion [Cl3W(μ-H)(μ-Me2S)2WCl3]−, 2, with bromide ion and with benzyl bromide are described. 1 was previously shown (1) to exist as a mixture of meso (C2v) and DL-pair (C1) of isomers, with the C2v isomer being the more stable. Displacement of the terminal dimethyl sulfide ligand of 1 by bromide ion results in the formation of the analogous isomers of ion [Cl3W(μ-H)(μ-Me2S)2WCl2Br]−, with retention of stereochemistry. The 1H NMR spectra of compounds in this series are uniquely informative as to the isomers present since the two environments of the methyl groups in the bridging dimethyl sulfide ligands (axial and equatorial) provide a probe for the ion stereochemistry. This is used to show that in reactions of 2 with benzyl bromide, after replacement of μ-H by Br, Br exchanges with terminal chlorides to give a mixture of isomers. Reactions of 1 with benzyl bromide are further complicated by the fact that both terminal dimethyl sulfide and μ-H are replaced by bromides which then redistribute over all possible terminal sites. Keywords: hydride, confacial bioctahedral complexes, tungsten, bromocarbons.

APA, Harvard, Vancouver, ISO, and other styles

20

Deacon, Glen B., Tiecheng Feng, Peter C. Junk, et al. "Structural Variety in Solvated Lanthanoid(III ) Halide Complexes." Australian Journal of Chemistry 53, no. 10 (2000): 853. http://dx.doi.org/10.1071/ch00117.

Full text

Abstract:

Treatment of lanthanum metal with CH2Br2 or CH2I2 in tetrahydrofuran (thf) under ultrasound conditions yields the corresponding [LaX3(thf)4] (X = Br, I) complexes in good yield. Recrystallization of [LaBr3(thf)4] from 1,2-dimethoxyethane (dme) or bis(2-methoxyethyl) ether (diglyme) generates [LaBr2(µ-Br)(dme)2]2 and [LaBr2(dig-lyme)2][LaBr4(diglyme)]. Treatment of lanthanoid metals with hexachloroethane in dme yields [LnCl3(dme)2] (Ln = La, Nd, Er or Yb) and in acetonitrile [YbCl2(MeCN)5]2[YbCl3(MeCN)(-Cl)2YbCl3(MeCN)]. The reaction of Yb metal pieces with 1,2-dibromoethane in thf and dme gave single crystals of [YbBr3(thf)3] and [YbBr3(dme)2], respectively. The X-ray determined structure of [LaBr3(thf)4] shows a seven-coordinate monomer with pentagonal-bipyramidal stereochemistry and apical bromide ligands. For [YbBr3(thf)3], a monomeric structure with mer-octa-hedral stereochemistry is observed. In [LaBr2(µ-Br)(dme)2]2, two eight-coordinate La centres are linked by two bridging bromides. The dme ligands have a trans relationship to each other, and cis terminal bromides are transoid to the bridging bromides with dodecahedral stereochemistry for La. By contrast, the 1: 1.5 diglyme adduct is found to be ionic [LaBr2(diglyme)2][LaBr4(diglyme)], with an eight-coordinate bicapped trigonal-prismatic lanthanum cation and a seven-coordinate pentagonal-bipyramidal lanthanum anion. In the cation, the bromide ligands are cis to each other, and in the anion, two bromides are equatorial and two are axial. In [YbBr3(dme)2], [YbCl3(dme)2] and [ErCl3(dme)2], a seven-coordinate pentagonal-bipyramidal arrangement exists with apical halogen ligands. Far-infrared data, and in particular the absence of absorptions attributable to Ì(La–Clter), suggest that [LaCl3(dme)] is polymeric with six bridging chlorides per lanthanum. For [YbCl2(MeCN)5]2[YbCl3(MeCN)(-Cl)2YbCl3-(MeCN)], a remarkable ionic structure, with pentagonal-bipyramidal [YbCl2(MeCN)5]+ cations and octahedral di-nuclear [YbCl3(MeCN)(-Cl)2YbCl3(MeCN)]2– counter ions, is observed. In the former, chloride ligands are apical, while the MeCN ligands of the latter are transoid.

APA, Harvard, Vancouver, ISO, and other styles

21

Golounin, A. V., V. A. Sokolenko, M. S. Tovbis, and O. V. Zakharova. "Complexes of nitronaphthols with aluminum bromide." Russian Journal of Applied Chemistry 80, no. 6 (2007): 1015–17. http://dx.doi.org/10.1134/s107042720706033x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Kazachenko, A. S., N. Yu Vasilyeva, Yu N. Malyar, and A. V. Miroshnikova. "Synthesis of the sulfated arabinogalactan tetramethylammonium complex." IOP Conference Series: Earth and Environmental Science 839, no. 4 (2021): 042094. http://dx.doi.org/10.1088/1755-1315/839/4/042094.

Full text

Abstract:

Abstract Sulfated polysaccharides, due to the presence of anionic groups, are able to form complexes with positively charged molecules. This work presents the results of obtaining complexes of the sulfated polysaccharide arabinogalactan with tetramethylammonium bromide. The resulting complex was shown to be soluble in water and methylene chloride. The introduction of tetramethylammonium bromide into the molecule of sulfated arabinogalactan has been proven by elemental analysis and FTIR spectroscopy.

APA, Harvard, Vancouver, ISO, and other styles

23

Šimek, Jiří, Nguyen Truong Son, and Eduard Ružička. "Spectrophotometric study of the reaction of alizarin green series dyes with uranyl ions in the presence of cationoid surfactants." Collection of Czechoslovak Chemical Communications 50, no. 3 (1985): 611–20. http://dx.doi.org/10.1135/cccc19850611.

Full text

Abstract:

The coordination properties of alizarin green series dyes with uranyl ions were studied in the presence of cationoid surfactants (cetylpyridinium bromide, carbethoxypentadecyltrimethylammonium bromide). Ternary complexes of the composition UO2L2S2, UO2L2S4, UO2L2S6, and UO2L3S9, where L is dye and S is surfactant, are formed in weakly acid solutions. The formation constants of the complexes were established and a procedure was worked out for the direct photometric determination of uranium.

APA, Harvard, Vancouver, ISO, and other styles

24

Rendle, D. F., and E. J. Glazier. "X-Ray Powder Diffraction Data for Complexes of Glucose Monohydrate with Sodium Bromide and Sodium Iodide." Powder Diffraction 7, no. 1 (1992): 38–41. http://dx.doi.org/10.1017/s0885715600016067.

Full text

Abstract:

AbstractX-ray powder diffraction data for the complexes of glucose monohydrate with sodium bromide (C6H12O6. ½NaBr·½H2O) and sodium iodide (C6H12O6·NaI·½H2O) are reported. The crystals of both complexes are trigonal with space group P31 (No. 144). The complex with sodium bromide has a = 16.4338 (6), c = 17.623 (1)Å, V = 4121.9 Å3, Z = 18 and Dx = 1.745 cm−3. The sodium iodide complex has a = 16.5249(6), c = 17.882(1) Å, V = 4228.8 Å3, Z = 18 and Dx = 1.867 g cm−3. The Smith-Snyder FN values for these data are F30 = 59.4(0.0097,52) for the sodium bromide complex and F30 = 82.7(0.0098,37) for the sodium iodide complex.

APA, Harvard, Vancouver, ISO, and other styles

25

Nuha H. Al-Saadawy and Ziad S. Fadhel. "(E)-2-((1,7,7-Trimethylbicyclo [2.2.1]Heptan-2-Ylidene) Amino) Acetic Acid Compound and their Metal Complexes: Synthesis and Characterization." journal of the college of basic education 23, no. 98 (2022): 93–108. http://dx.doi.org/10.35950/cbej.v23i98.8847.

Full text

Abstract:

The reaction of camphor with glycine under the showing conditions yielded (E)-2-((1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)amino)acetic acid ligand . The complexes of Cu(II), Ni(II), Co(II), Zn(II) and Fe(II) with ligand have been obtained by the reaction between copper bromide, hydrate nickel chloride, hydrate cobalt chloride, zinc chloride, and iron bromide with ligand in 1:2 mole ratio. The free ligands and their metal complexes have been separated in the solid state. The spectroscopic data of the complexes recommend their 1:2 structures which are researched by elemental analysis (CHN) 1H NMR and FT-IR spectroscopy. From the spectroscopic data proposed the octahedral structure for the all complexes.

APA, Harvard, Vancouver, ISO, and other styles

26

Mohamad, Ahmad Desoky M., M. J. A. Abualreish, and Ahmed M. Abu-Dief. "Temperature and salt effects of the kinetic reactions of substituted 2-pyridylmethylene-8-quinolyl iron (II) complexes as antimicrobial, anti-cancer, and antioxidant agents with cyanide ions." Canadian Journal of Chemistry 99, no. 9 (2021): 763–72. http://dx.doi.org/10.1139/cjc-2020-0412.

Full text

Abstract:

Kinetics of substitution reaction of three high-spin pyridylmethylene-8-quinolyl iron (II) complexes by CN– ions were studied spectrophotometrically in various ratios of aqueous–methanol binary mixtures at 298 ± 0.2 K. Kinetics of the substitution reaction follow the rate law (k2[CN−][complex]) on applying of the conditions of the pseudo first order reaction. Reactivity of the reaction was investigated in terms of ligand moiety and solvent effects. The rate of the reaction increased as the co-solvent methanol ratio increased. This reactivity trend is predominantly due to increases in the activity coefficient of those hydrophobic complexes in the organic methanol co-solvent, depending upon the hydrophobicity of the substituent groups (R) in the coordinated ligand in the complexes. Reactivity trends of the prepared complexes in the presence of the inserted hydrophobic salts such as tetrabutylammonium bromide (TBAB), tetraethylammonium bromide (TEAB), and tetramethylammonium bromide (TMAB) or hydrophilic salt potassium bromide (KBr) were studied. The observed decrease in the rate constants with increasing salt concentration was due to the cationic character of the reacting complexes. In addition, the synthesized compounds were tested for antimicrobial activity against selected strains of microbes. The results showed that the order of reactivity of the investigated complexes against the selected microbes were as follows: ppaqFe > paaqFe > pmaqFe. In addition, the investigated ligands and their Fe(II) complexes were screened for anticancer activities against several cell lines of cancer. The ppaqFe complex showed the best cytotoxic efficiency against the selected cancer lines (IC50 = 8.75–21.50 µg/µl), whereas the pmaq ligand showed the lowest cytotoxic efficiency (IC50 = 58.25– 72.40). Furthermore, the antioxidant potential of the presented compounds was studied by applying DPPH assays and showed a potential activity compared with standard vitamin C. The excellent antimicrobial and anticancer activities of the investigated Fe(II) chelates compared with literature values are promising and deserve further study.

APA, Harvard, Vancouver, ISO, and other styles

27

Akulinin, P. V., Е. V. Savinkina, М. S. Grigoriev, and Yu А. Belousov. "Structural variability of rare-earth bromide complexes with acetylurea." Žurnal neorganičeskoj himii 69, no. 5 (2024): 727–35. http://dx.doi.org/10.31857/s0044457x24050102.

Full text

Abstract:

New coordination compounds of light rare-earth (RE) bromides with acetylurea (AsUr) were synthesized, [Y(AcUr)2(H2O)4]1.39[Y(AcUr)2(H2O)5]0.61Br6·2H2O (I), [La(AcUr)2(H2O)5]Br3 (II), [Ce(AcUr)2(H2O)5]Br3 (III), [Nd(AcUr)2(H2O)5]Br3 (IV), [Sm(AcUr)2(H2O)5]Br3 (V); elemental analysis, IR spectroscopy and X-ray diffraction were used to determine their compositions and structural features. Compound I is built of the [Y(AcUr)2(H2O)4]3+ and [Y(AcUr)2(H2O)5]3+ cations in the 2.28 : 1; they differ by the number of the inner-sphere water molecules (4 and 5 for coordination numbers 8 and 9, respectively), non-coordinated Br— ions and H2O molecules. Compounds II and III are built of the [Ln(AcUr)2(H2O)5]3+ (Ln = La, Ce) cations and outer-sphere Br— ions. The structures changes on cooling from 296 K to 100 K being isostructural at both temperatures. Compounds IV and V have the same composition, but different structures. They also have different polymorphous modifications at 100 and 296 K. Samarium, terbium and dysprosium bromide complexes of acetyl urea show photoluminescence.

APA, Harvard, Vancouver, ISO, and other styles

28

Leitner, Sebastian, Manuela List, and Uwe Monkowius. "Synthesis, Characterization and Luminescence of Silver(I) and Gold(I) Complexes Bearing a Diethyl Acetal Functionalized N-Heterocyclic Carbene." Zeitschrift für Naturforschung B 66, no. 12 (2011): 1255–60. http://dx.doi.org/10.1515/znb-2011-1210.

Full text

Abstract:

1-(2,2ʹ-Diethoxyethyl)-3-methyl-imidazolium bromide, 1, has been prepared and used as a precursor for the synthesis of the corresponding silver bromide complex [(NHC)2Ag][AgBr2], 2. Transmetallation of 2 with (tht)AuBr (tht = tetrahydrothiophene) yields (NHC)AuBr, 3. The solid-state structures of 2 and 3 have been determined by single-crystal X-ray diffraction revealing a loose aggregation of the complexes by weak metal-metal interactions. Due to the presence of these contacts, both complexes are emissive in the solid state.

APA, Harvard, Vancouver, ISO, and other styles

29

Alikberova, L. Yu, D. V. Albov, P. S. Kibalnikov, M. I. Vergeles, G. A. Fedorova, and E. V. Volchkova. "ACETAMIDE COMPLEXES FOR CHLORIDES AND BROMIDES OF SOME LANTHANIDES: SYNTHESIS AND PROPERTIES." Fine Chemical Technologies 11, no. 4 (2016): 43–49. http://dx.doi.org/10.32362/2410-6593-2016-11-4-43-49.

Full text

Abstract:

The aim of the this work is the synthesis and study (IR, single crystal XRD, DTG) of complex compounds of chlorides and bromides of lanthanum, neodymium, holmium, and erbium with acetamide [Ln(AA)4(H2O)4]Cl3·H2O (Ln = La, Nd, Ho, Er ) and [La(AA)4(H2O)4]Br3·H2O. Ligands (Ln) coordination occurs through the oxygen atoms, and the coordination polyhedra of the Ln atoms are distorted tetragonal antiprisms or two-capped trigonal prisms (CN = 8). All the studied complexes are characterized by a developed system of hydrogen bonds with the bromide or chloride ions (and outer-sphere water molecules) in the cavities of the structure formed by the complex cations. The features of the complexes thermal decomposition are discussed.

APA, Harvard, Vancouver, ISO, and other styles

30

Khan, Syed Ishtiaq, Sajjad Ahmad, Inayat Ali Khan, et al. "Mononuclear copper(i) complexes of triphenylphosphine and N,N′-disubstituted thioureas as potential DNA binding chemotherapeutics." New Journal of Chemistry 45, no. 20 (2021): 8925–35. http://dx.doi.org/10.1039/d0nj06182d.

Full text

Abstract:

Herein, nine copper(i) bromide complexes with N,N′-disubstituted thioureas and triphenylphosphine, were synthesized via a simple solution-based reaction at 60 °C and characterized, selected complexes were screened for DNA binding.

APA, Harvard, Vancouver, ISO, and other styles

31

Singh, Pavneet, and Mark M. Richter. "Electrogenerated chemiluminescence of Pb(II)-bromide complexes." Inorganica Chimica Acta 357, no. 5 (2004): 1589–92. http://dx.doi.org/10.1016/j.ica.2003.12.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Adonin, Sergey A., Marianna E. Rakhmanova, Anton I. Smolentsev, Ilya V. Korolkov, Maxim N. Sokolov, and Vladimir P. Fedin. "Binuclear Bi(iii) halide complexes with 4,4′-ethylenepyridinium cations: luminescence tuning by reversible solvation." New Journal of Chemistry 39, no. 7 (2015): 5529–33. http://dx.doi.org/10.1039/c5nj00889a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Matsubara, Fujii, Hosokawa, Inatomi, Yamada, and Koga. "Fluorine-Substituted Arylphosphine for an NHC-Ni(I) System, Air-Stable in a Solid State but Catalytically Active in Solution." Molecules 24, no. 18 (2019): 3222. http://dx.doi.org/10.3390/molecules24183222.

Full text

Abstract:

Monovalent NHC-nickel complexes bearing triarylphosphine, in which fluorine is incorporated onto the aryl groups, have been synthesized. Tris(3,5-di(trifluoromethyl)-phenyl)phosphine efficiently gave a monovalent nickel bromide complex, whose structure was determined by X-ray diffraction analysis for the first time. In the solid state, the Ni(I) complex was less susceptible to oxidation in air than the triphenylphosphine complex, indicating greatly improved solid-state stability. In contrast, the Ni(I) complex in solution can easily liberate the phosphine, high catalytic activity toward the Kumada–Tamao–Corriu coupling of aryl bromides.

APA, Harvard, Vancouver, ISO, and other styles

34

TURKYİLMAZ, Murat, Murat DÖNMEZ, and Murat ATES. "Synthesis of Pincer type carbene and their Ag(I)-NHC complexes, and their Antimicrobial activities." Journal of Sustainable Construction Materials and Technologies 7, no. 2 (2022): 53–61. http://dx.doi.org/10.47481/jscmt.1117139.

Full text

Abstract:

In this study, theophylline (1) compounds were synthesized with addition of 2-bromoetha-nol, 2-bromoacetamide and methyl-2-bromoacetate to attain symmetric connections to NHCs (2a–c). New complexes containing the symmetric N-heterocyclic carbene (NHC) ligands were synthesized using azolium salts in dimethyl formamide (DMF). After the NHC predecessor compounds reacted with Ag2O, Ag(I)-NHC complexes were synthesized in the following: 7,9-di-(2-hydroxyethyl)-8,9-dihydro-1,3-dimethyl-1H-purine-2,6(3H,7H)-dionedium silver(I)bromide (3a), 7,9-di(acetamide)-8,9-dihydro-1,3-dimethyl-1H-purine-2,6(3H,7H)-di-ondium silver(I)bromide (3b) and 7,9-di(methylacetate)-8,9-dihydro-1,3-dimethyl-1H-pu-rine-2,6(3H,7H)-diondiumsilver(I)bromide (3c). Both synthesized NHC predecessors (2a-c) and Ag(I)-NHC complexes (3a-c) were described by FTIR, 1H-NMR, 13C-NMR, liquid and solid-state conductivity values, TGA analysis, melting point analysis and XRD spectroscopy. In-vitro antibacterial activities of NHC-predecessors and Ag(I)-NHC complexes were tested against gram-positive bacteria (Staphylococcus Aureus and Bacillus Cereus), gram-negative bacteria (Escherichia Coli and Listeria Monocytogenes), and fungus (Candida Albicans) in Tryptic Soy Broth method. Ag(I)-NHC complexes showed higher antibacterial activity than pure NHC predecessors. The lowest microbial inhibition concentration (MIC) value of compound 3a was obtained as 11.56 μg/ml for Escherichia Coli and 11.52 μg/ml for Staphylococcus Aureus. All tested complexes displayed antimicrobial activity with different results.

APA, Harvard, Vancouver, ISO, and other styles

35

MOODY, A. John, Clive S. BUTLER, Nicholas J. WATMOUGH, Andrew J. THOMSON, and Peter R. RICH. "The reaction of halides with pulsed cytochrome bo from Escherichia coli." Biochemical Journal 331, no. 2 (1998): 459–64. http://dx.doi.org/10.1042/bj3310459.

Full text

Abstract:

Cytochrome bo forms complexes with chloride, bromide and iodide in which haem o remains high-spin and in which the ‘630 nm ’ charge-transfer band is red-shifted by 7–8 nm. The chloride and bromide complexes each have a characteristic set of integer-spin EPR signals arising from spin coupling between haem o and CuB. The rate and extent of chloride binding decreases as the pH increases from 5.5 to 8.5. At pH 5.5 the dissociation constant for chloride is 2 mM and the first-order rate constant for dissociation is 2×10-4 s-1. The order of rate of binding, and of affinity, at pH 5.5 is chloride (1) > bromide (0.3) > iodide (0.1). It is suggested that the halides bind in the binuclear site but, unlike fluoride, they are not direct ligands of the iron of haem o. In addition, both the stability of the halide complexes and the rate of halide binding seem to be increased by the co-binding of a proton.

APA, Harvard, Vancouver, ISO, and other styles

36

Shvydkiy, Nikita V., Egor A. Dlin, Klimentiy V. Ivanov, Anastasiya G. Buyanovskaya, Yulia V. Nelyubina, and Dmitry S. Perekalin. "Synthesis and reactivity of cyclobutadiene nickel bromide." Dalton Transactions 49, no. 20 (2020): 6801–6. http://dx.doi.org/10.1039/d0dt01510e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Hasson, Mohammed Mujbel, Adil A. Awad, and Mahmoud Najim Al-Jibouri. "Synthesis and Structural Investigation of Some Transition Metals Complexes of Benzimidazolium Bromide." Asian Journal of Chemistry 31, no. 3 (2019): 607–12. http://dx.doi.org/10.14233/ajchem.2019.21641.

Full text

Abstract:

The present work involves the synthesis of novel imidazolium salts of bromide in step-wise reactions which are started from preparation of 2,4-dimorpholine-6-(1H-benzimidazole-1-yl)-1,3,5-triazine (1) in potassium hydroxide and DMF solvent followed by substitution reactions with n-butyl bromide and n-octyl bromide to afford the new ligands names L1 = 1-(2,4-dimorpholino-1,3,5-triazine-2-yl)-3-butyl-1H-benzimidazol-3-ium bromide and L2 = 1-(2,4-dimorpholino-1,3,5-triazine-2-yl)-3-octyl-1Hbenimidazol-3-ium bromide. The new ligands were recrystallized from hot chloroform and the following of reactions completion were carried out by thin layer chromatography (TLC). The formula and structures of the two salts of benzimidazolium bromide were confirmed on the basis of measurements of (CHN) elemental analyses, FT-IR, NMR and EIMS spectroscopy. Furthermore the manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes were synthesized from the direct reactions of their hydrated metal salts in methanol with the solutions of the ligands in chloroform in 1:1 mole ratio and the analytical data of atomic absorption spectroscopy and elemental analyses revealed the proposed formula of the solid metal complexes. The data obtained from FT-IR, UV-Visible spectra, molar conductivity and magnetic susceptibility measurements confirmed the octahedral environment around cobalt(II) ion in [CoL(H2O)2Cl2] and the tetrahedral geometry was adopted for manganese(II) and zinc(II) ions. However the square-planner structure was expected for the copper(II) and nickel(II) complexes in [MLCl2], M = Ni(II) and Cu(II) ions and L = L1 and L2 ligands. As well as the suitable and favourable active sites in the two ligands L1 and L2 were the two nitrogen atoms of morpholine rings which has been observed from FT-IR spectra and the kinetic stability of five-member ring up on chelation with the metal ions supported the conclusion of the symmetry.

APA, Harvard, Vancouver, ISO, and other styles

38

Fialkovsky, Igor, Denis Lutskiy, Andrey Alekseev, and Alexey Blinov. "Modelling the Effect of Temperature on the Stability of Bromide and Carbonate Complexes of Europium, Gadolinium, Terbium and Determination of their Thermodynamic Functions." Materials Science Forum 1031 (May 2021): 103–8. http://dx.doi.org/10.4028/www.scientific.net/msf.1031.103.

Full text

Abstract:

A method has been developed for calculating the stability constants of inorganic complexes of rare-earth metals at various temperatures, based on analysis of the literature data by obtaining a linear regression equation on the form: . Using this method, the stability constants of bromide LnBr2+ and carbonate LnCO3+ complexes of europium, terbium, and gadolinium in aqueous solutions at temperatures of 50, 75, and 100 ° C were obtained. The obtained values of the coefficients А(T1) and В(T1) of the linear regression equation can be used to calculate the stability constants of complexes of europium, terbium, and gadolinium with other inorganic ligands at given temperatures. Based on the temperature dependence of the stability constants of bromide and carbonate complexes, their standard entropies and enthalpies of formation were calculated. Based on the obtained values of the thermodynamic functions, an assumption was made about the outer-sphere or inner-sphere nature of the complex.

APA, Harvard, Vancouver, ISO, and other styles

39

Younesi, Yasamin, Bahare Nasiri, Rasool BabaAhmadi, Charlotte E. Willans, Ian J. S. Fairlamb, and Alireza Ariafard. "Theoretical rationalisation for the mechanism of N-heterocyclic carbene-halide reductive elimination at CuIII, AgIII and AuIII." Chemical Communications 52, no. 28 (2016): 5057–60. http://dx.doi.org/10.1039/c6cc01299j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Malan, Frederick P., Eric Singleton, Petrus H. van Rooyen, and Marilé Landman. "Tandem transfer hydrogenation–epoxidation of ketone substrates catalysed by alkene-tethered Ru(ii)–NHC complexes." New Journal of Chemistry 43, no. 22 (2019): 8472–81. http://dx.doi.org/10.1039/c9nj01220f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Valencia, Laura, Paulo Pérez-Lourido, Rufina Bastida, and Alejandro Macías. "Mn(II) azamacrocyclic bromide complexes with different nuclearities." Journal of Organometallic Chemistry 694, no. 14 (2009): 2185–90. http://dx.doi.org/10.1016/j.jorganchem.2009.02.026.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Texter, John. "Stability constants for aqueous silver/bromide/thiocyanate complexes." Analytica Chimica Acta 215 (1988): 187–201. http://dx.doi.org/10.1016/s0003-2670(00)85277-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Bhuiyan, Mohammad A. I., Willie R. Hargrove, Clyde R. Metz, Peter S. White, and Shawn C. Sendlinger. "Improved synthetic routes to tungsten(IV) bromide complexes." Transition Metal Chemistry 40, no. 6 (2015): 613–21. http://dx.doi.org/10.1007/s11243-015-9954-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Kulik, A. V., O. N. Temkin, L. G. Bruk, V. E. Zavodnik, V. K. Belsky, and V. V. Minin. "Palladium(I) and palladium(0) carbonyl bromide complexes." Russian Chemical Bulletin 54, no. 6 (2005): 1391–97. http://dx.doi.org/10.1007/s11172-005-0416-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Emmenegger, Franzpeter, and Michel Piccand. "Gaseous complexes of cobalt(II) bromide and pyridine." Zeitschrift f�r anorganische und allgemeine Chemie 619, no. 1 (1993): 17–21. http://dx.doi.org/10.1002/zaac.19936190106.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Besora, Maria, and Feliu Maseras. "The diverse mechanisms for the oxidative addition of C–Br bonds to Pd(PR3) and Pd(PR3)2 complexes." Dalton Transactions 48, no. 43 (2019): 16242–48. http://dx.doi.org/10.1039/c9dt03155c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Field, LD, TW Hambley, T. He, PA Humphrey, CM Lindall, and AF Masters. "The Syntheses of [M(C5Ph5)2]n+ (N=0,1) Complexes of Nickel, Iron and Chromium. The Structures of the Decaphenylmetallocenium Cations of Nickel and Iron." Australian Journal of Chemistry 49, no. 8 (1996): 889. http://dx.doi.org/10.1071/ch9960889.

Full text

Abstract:

Decaphenylnickelocene is isolated from the reaction between [Ni(CO)2(PPh3)2], 5-bromo-1,2,3,4,5-pentaphenylcyclopenta-1,3-diene and zinc dust. Decaphenylnickelocene is obtained as air-stable crystals, insoluble in most common solvents. It can be oxidized by bromine or by nitronium tetrafluoroborate to the decaphenylnickelocenium cation, which can be chemically reduced to decaphenylnickelocene. The decaphenylnickelocenium cation is characterized spectroscopically and its crystal structure, as its tribromide and tetrafluoroborate salts, is reported. The structures are compared with that of decaphenylferrocenium tribromide, which is formed by bromine oxidation of decaphenylferrocene. Decaphenylchromocenium tribromide is prepared by bromine oxidation of decaphenylchromocene, which is prepared from [Cr(MeCN)3(CO)3], pentaphenylcyclopentadienyl bromide and zinc dust.

APA, Harvard, Vancouver, ISO, and other styles

48

Legaspi, Kristine, Jonathan Soto, Tianhua Tang, Matthew Sigman, Shelley Minteer, and Diane Smith. "A Voltammetric Investigation of the Electrocatalytic Cycle Mechanism of Fe(I) and Mn(I) Complexes." ECS Meeting Abstracts MA2023-01, no. 44 (2023): 2414. http://dx.doi.org/10.1149/ma2023-01442414mtgabs.

Full text

Abstract:

Earth-abundant, first row, low coordinate transition metal complexes are promising candidates for the electrocatalysis of a variety of organic synthesis reactions. However, transition metal complexes in the M(I) state have the propensity to undergo disproportionation, hindering their ability to carry out the electrocatalytic cycle. In this study, we seek to identify and understand the mechanism by which the M(I) complexes may act as an electrocatalyst for a simple organic coupling reaction, beginning with the radicalization of benzyl bromide as a representative starting material. Initial characterization of the complex and its components by cyclic voltammetry demonstrate general stability of the catalyst, while equivalent additions of benzyl bromide exhibit the execution of the electron transfer and radical generation. Cyclic voltammetry simulations provide supplementary guidance into the relationship between benzyl bromide and the catalyst. Additional experiments conducted using analytical techniques such as mass spectrometry, x-ray spectroscopy, and nuclear magnetic resonance help to further characterize portions of the proposed mechanism and supporting details. Analysis to date suggests that the model electrocatalytic cycle is interrupted to an extent, with contributions from both disproportionation and substituted coordination at the transition metal center. Experimental and simulated voltammograms are qualitatively consistent with this proposed catalytic cycle interruption.

APA, Harvard, Vancouver, ISO, and other styles

49

BALAN-PORCĂRAŞU, Mihaela, Alina NICOLESCU, Emilian GEORGESCU, et al. "Benzimidazolium bromide derivative inclusion complexes with native and modified beta-cyclodextrins." Revue Roumaine de Chimie 68, no. 3-4 (2024): 119–25. http://dx.doi.org/10.33224/rrch.2023.68.3-4.01.

Full text

Abstract:

The interactions between four native and modified beta-cyclodextrins and a benzimidazolium bromide salt were analyzed through UV-Vis and NMR Spectroscopy. The new benzimidazolium salt was obtained by simple and efficient conversion of N-1 substituted 5,6-dimethylbenzimidazole with phenacyl bromide in acetone. In all cases, the complexes stoichiometry was 1:1, as determined from UV-Vis titrations. Based on the values for association constants, the strength of the interactions with benzimidazolium bromide was weakest with the methyl substituted beta-cyclodextrin and strongest with the sulfobutylether substituted beta-cyclodextrin. Through-space NOE experiments were used to investigate the structural aspects of inclusion process. The obtained NOE correlations indicate coexistence of two inclusion modes: one with the phenacyl group inside the cyclodextrin cavity and the second one with dimethyl-substituted benzene ring inside the cavity. The imidazole ring and the ethyl substituent have been proven to remain outside the cyclodextrin cavity in both inclusion modes.

APA, Harvard, Vancouver, ISO, and other styles

50

Wallasch, Mark W., Felix Rudolphi, Gotthelf Wolmershäuser та Helmut Sitzmann. "High-spin Cyclopentadienyl Complexes, Part 6. σ/π-Rearrangement of Aryl Ligands Connected to Cyclopentadienyliron Fragments". Zeitschrift für Naturforschung B 64, № 1 (2009): 11–17. http://dx.doi.org/10.1515/znb-2009-0103.

Full text

Abstract:

Dimeric tri(tert-butyl)cyclopentadienyliron(II) bromide [CpmFe(μ-Br)]2 (1) reacts with phenylmagnesium bromide to give the dinuclear di(cyclohexadienylidene) complex [(CpmFe)2(μ,η5:η5-H5C6=C6H5)] (2), and with mesitylmagnesium bromide either to the dinuclear complex [CpmFe-(μ,η5:η1-C6H2Me3)Fe(Br)Cpm] (3) or to the mononuclear mesityl complex [CpmFeC6H2Me3] (4), depending on the reaction conditions. The mesityl complex 4 undergoes rearrangement and adds via the mesityl ipso carbon atom to bromide 1 with formation of 3. A similar reaction occurs with the nickel analog of bromide 1. In the latter case, however, mesityl is replaced by tolyl during reaction in toluene, with phenyl in benzene, and remains unchanged if the reaction is carried out in pentane solution. An electrophilic attack at the arene solvent used is discussed for the exchange reaction. For the crystallographically characterized complexes 3 and [CpFem(μ,η1:η5-C6H4Me)Ni(Br)Cpm] (5) with a meta-tolyl ligand a significant deviation of the CpmFe fragment from a symmetrical position above the six-membered ring ligand raises questions regarding a possible contribution of a cyclohexadienylylidene resonance structure.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!