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Journal articles on the topic 'Metal-oxo complexes'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Mathur, Pradeep, and Saurav Chatterjee. "OXO INCORPORATED METAL ACETYLIDE COMPLEXES." Comments on Inorganic Chemistry 26, no. 5-6 (September 2005): 255–86. http://dx.doi.org/10.1080/02603590500403933.

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2

Yang, Yi, Visalakshi Ramamoorthy, and Paul R. Sharp. "Late transition metal oxo and imido complexes. 11. Gold(I) oxo complexes." Inorganic Chemistry 32, no. 10 (May 1993): 1946–50. http://dx.doi.org/10.1021/ic00062a012.

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3

Yang, Lili, Fang Wang, Jiali Gao, and Yong Wang. "What factors tune the chemical equilibrium between metal-iodosylarene oxidants and high-valent metal-oxo ones?" Physical Chemistry Chemical Physics 21, no. 3 (2019): 1271–76. http://dx.doi.org/10.1039/c8cp06117c.

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4

Kobayashi, Yusuke. "Reduction with Hydrosilanes Catalyzed by Metal-oxo Complexes." Journal of Synthetic Organic Chemistry, Japan 68, no. 8 (2010): 866–67. http://dx.doi.org/10.5059/yukigoseikyokaishi.68.866.

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5

Garden, J. A., and S. D. Pike. "Hydrolysis of organometallic and metal–amide precursors: synthesis routes to oxo-bridged heterometallic complexes, metal-oxo clusters and metal oxide nanoparticles." Dalton Transactions 47, no. 11 (2018): 3638–62. http://dx.doi.org/10.1039/c8dt00017d.

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6

Khosravi, Iman, and Mohammad Yazdanbakhsh. "Preparation and characterization of novel oxo-centered basic p-chlorobenzoic bridging trinuclear complexes." Journal of the Serbian Chemical Society 75, no. 7 (2010): 929–34. http://dx.doi.org/10.2298/jsc090825066k.

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Three new oxo-centered trinuclear complexes, one of them a mixed-valence complex [Mn3O(C7H4O2Cl)6(Py)3]Py (1) and the others, mixed-metal complexes of [Fe2MnO(C7H4O2Cl)6(Py)3]NO3 (2) and [Fe2CoO(C7H4O2Cl)6(Py)3] (3) were synthesized by the direct reaction between metal nitrates and p-chlorobenzoic acid. These complexes were characterized by elemental analyses (CHN), atomic absorption spectroscopy and spectral (IR, electronic) studies. These are new type of oxo-bridged mixed-metal complexes in which the carboxylate ligand is pchlorobenzoic acid. The UV spectra of the complexes exhibited a strong band in the region 42,500 cm-1 which is related to the (? ? ?*) transitions of the pyridine ligand. The IR spectra of these compounds showed two strong stretching vibrations bands, indicating a bridging coordination mode of the carboxylic group of the ligand in the complexes.

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7

Fukuzumi, Shunichi. "Electron transfer and catalysis with high-valent metal-oxo complexes." Dalton Transactions 44, no. 15 (2015): 6696–705. http://dx.doi.org/10.1039/c5dt00204d.

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8

O’Halloran, Kevin P., Chongchao Zhao, Nicole S. Ando, Arthur J. Schultz, Thomas F. Koetzle, Paula M. B. Piccoli, Britt Hedman, et al. "Revisiting the Polyoxometalate-Based Late-Transition-Metal-Oxo Complexes: The “Oxo Wall” Stands." Inorganic Chemistry 51, no. 13 (June 13, 2012): 7025–31. http://dx.doi.org/10.1021/ic2008914.

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9

Sharp, Paul R., and John R. Flynn. "Late-transition-metal .mu.-oxo and .mu.-imido complexes. 1. .mu.-Oxo complexes of rhodium and iridium." Inorganic Chemistry 26, no. 19 (September 1987): 3231–34. http://dx.doi.org/10.1021/ic00266a036.

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10

Fukuzumi, Shunichi. "Electron-transfer properties of high-valent metal-oxo complexes." Coordination Chemistry Reviews 257, no. 9-10 (May 2013): 1564–75. http://dx.doi.org/10.1016/j.ccr.2012.07.021.

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11

Griffith, William P., Neil T. McManus, and Andrew D. White. "Studies on transition-metal oxo and nitrido complexes. Part 8. Reactions of osmium oxo-imido complexes with alkenes." Journal of the Chemical Society, Dalton Transactions, no. 5 (1986): 1035. http://dx.doi.org/10.1039/dt9860001035.

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12

Carrasco, Maria C., and Shabnam Hematian. "(Hydr)oxo-bridged heme complexes: From structure to reactivity." Journal of Porphyrins and Phthalocyanines 23, no. 11n12 (December 2019): 1286–307. http://dx.doi.org/10.1142/s1088424619300258.

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Iron–porphyrins ([Formula: see text] hemes) are present throughout the biosphere and perform a wide range of functions, particularly those that involve complex multiple-electron redox processes. Some common heme enzymes involved in these processes include cytochrome P450, heme/copper oxidase or heme/non-heme diiron nitric oxide reductase. Consequently, the (hydr)oxo-bridged heme species have been studied for the important roles that they play in many life processes or for their application for catalysis and preparation of new functional materials. This review encompasses important synthetic, structural and reactivity aspects of the (hydr)oxo-bridged heme constructs that govern their function and application. The properties and reactivity of the bridging (hydr)oxo moieties are directly dictated by the coordination environment of the heme core, the nature and ligation of the second metal center attached to the (hydr)oxo group, the presence or absence of a linker, and the degree of flexibility around that linker within the scaffold. Here, we summarize the structural features of all known (hydr)oxo-bridged heme constructs and use those to categorize and thus, provide a more comprehensive picture of structure–function relationships.

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13

Zhang, Yingjie, Daniel J. Fanna, Nicholas D. Shepherd, Inna Karatchevtseva, Kim Lu, Linggen Kong, and Jason R. Price. "Dioxo-vanadium(v), oxo-rhenium(v) and dioxo-uranium(vi) complexes with a tridentate Schiff base ligand." RSC Advances 6, no. 79 (2016): 75045–53. http://dx.doi.org/10.1039/c6ra12872f.

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14

Setsune, Jun-ichiro, Aki Tsukajima, and Naho Okazaki. "Synthesis and structure of isocorrole metal complexes." Journal of Porphyrins and Phthalocyanines 13, no. 02 (February 2009): 256–65. http://dx.doi.org/10.1142/s1088424609000334.

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gem-dimethylisocorrole gave four-coordinate Ni (II) and Cu (II) complexes, five-coordinate (chloro) Fe (III) and (chloro) Mn (III) complexes, and six-coordinate (chloro)(pyridinato) Rh (III) complex in moderate to good yields. The dinuclear complexes such as the μ-oxo-diiron(III) complex and tetracarbonyldirhodium(I) complex were also prepared. The structures of these mononuclear and dinuclear complexes were determined by X-ray crystallography. These structures are very similar to those of the corresponding metaloporphyrins but the presence of the sp3-meso carbon allows tilting of the pyrrole rings so as to adapt itself to various metal coordination geometries.

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15

Kannan, Neppoliyan, Akshay R. Patil, and Arup Sinha. "Direct C–H bond halogenation and pseudohalogenation of hydrocarbons mediated by high-valent 3d metal-oxo species." Dalton Transactions 49, no. 41 (2020): 14344–60. http://dx.doi.org/10.1039/d0dt02533j.

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16

Zdravkova, Zdravka, Jordanka Petrova, Mariana Mitewa, and Dimitar Mechandjiev. "TRANSITION METAL COMPLEXES OF DIETHYL-(2-OXO-1-PHENYLETHYL)PHOSPHONATE." Phosphorus, Sulfur, and Silicon and the Related Elements 82, no. 1-4 (February 1993): 61–66. http://dx.doi.org/10.1080/10426509308047408.

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17

Beyer, Martin, Christian Berg, Gerhard Albert, Uwe Achatz, Stefan Joos, Gereon Niedner-Schatteburg, and Vladimir E. Bondybey. "Dinitrogen and Carbon Dioxide Fixation by Transition Metal Oxo Complexes." Journal of the American Chemical Society 119, no. 6 (February 1997): 1466–67. http://dx.doi.org/10.1021/ja963013e.

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18

Engelmann, Xenia, Inés Monte-Pérez, and Kallol Ray. "Oxidation Reactions with Bioinspired Mononuclear Non-Heme Metal-Oxo Complexes." Angewandte Chemie International Edition 55, no. 27 (June 16, 2016): 7632–49. http://dx.doi.org/10.1002/anie.201600507.

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19

Liu, Yingying, and Tai-Chu Lau. "Activation of Metal Oxo and Nitrido Complexes by Lewis Acids." Journal of the American Chemical Society 141, no. 9 (February 2019): 3755–66. http://dx.doi.org/10.1021/jacs.8b13100.

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20

Bakac, Andreja. "Hydrogen Atom Abstraction by Metal−Oxo and Metal−Superoxo Complexes: Kinetics and Thermodynamics." Journal of the American Chemical Society 122, no. 6 (February 2000): 1092–97. http://dx.doi.org/10.1021/ja993371s.

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21

Hill, Craig L., and et al et al. "ChemInform Abstract: Revisiting the Polyoxometalate-Based Late-Transition-Metal-Oxo Complexes: The “Oxo Wall” Stands." ChemInform 43, no. 39 (August 30, 2012): no. http://dx.doi.org/10.1002/chin.201239001.

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22

Bell, Nicola L., Polly L. Arnold, and Jason B. Love. "Controlling uranyl oxo group interactions to group 14 elements using polypyrrolic Schiff-base macrocyclic ligands." Dalton Transactions 45, no. 40 (2016): 15902–9. http://dx.doi.org/10.1039/c6dt01948j.

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23

Turner, N. A., R. C. Bray, and G. P. Diakun. "Information from e.x.a.f.s. spectroscopy on the structures of different forms of molybdenum in xanthine oxidase and the catalytic mechanism of the enzyme." Biochemical Journal 260, no. 2 (June 1, 1989): 563–71. http://dx.doi.org/10.1042/bj2600563.

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X-ray spectroscopy was used to provide further information on the structure of the molybdenum centre of xanthine oxidase. Earlier work was confirmed and two states of the enzyme, not reported on by previous workers, were studied. One of these was the complex of the enzyme with pyridine-3-carboxaldehyde, in which most of the metal is in the Mo(V) state, giving the e.p.r. signal known as Inhibited. The other was the complex with the inhibitor alloxanthine, with the metal as Mo(IV). For both complexes clear evidence was obtained that an oxo ligand of molybdenum was present, but not a sulphido ligand. This information complements structural information on these complexes already available from e.p.r. spectroscopy, and has permitted us to revise and refine the structures previously proposed. The mechanism of action of the enzyme is discussed in the light of the present findings on the persistence of the oxo group in the reduced enzyme complexes, as well as of related evidence [George & Bray (1988) Biochemistry 27, 3603-3609] for an oxo group in the catalytic intermediate that gives the Mo(V) e.p.r. signal known as Very Rapid.

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24

Singh, Prashant, Shanu Das, and Rajesh Dhakarey. "Bioinorganic Relevance of Some Cobalt(II) Complexes with Thiophene-2-glyoxal Derived Schiff Bases." E-Journal of Chemistry 6, no. 1 (2009): 99–105. http://dx.doi.org/10.1155/2009/801345.

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Complexes of Co(II) with two new Schiff bases TEAB [2-hydroxy-4-{[2-oxo-2-(thiophen-2-yl)ethylidene]amino}benzoic acid] and TEPC [N-[2-oxo-2-(thiophen-2-yl)ethylidene]pyridine-3-carboxamide] have been synthesized and characterized with the help of elemental analysis, magnetic, mass,1H-NMR,13C-NMR, IR and electronic spectral data. IR spectra manifest the coordination of the ligand to the metal ion through the carbonyl oxygen, azomethine nitrogen and thienyl sulphur atoms. With the help of electronic spectral data various ligand field parameters were also calculated. All these studies reveal the distorted octahedral Co(II) complexes. Synthesized compounds have also been screened against some micro organismsviz, Escherichia coli, Proteus vulgaris, Aspergillus nigerandAspergillus flavuswith the help of ‘filter paper disc’ technique. It has been observed that the antimicrobial activities of metal complexes are higher than that of the free ligand.

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25

Silva, Manuela Ramos, João N. J. Nogueira, Pedro A. O. C. Silva, Consuelo Yuste-Vivas, Laura C. J. Pereira, and João Carlos Waerenborgh. "Oxo-Bridged Trinuclear Fe(III) Complexes: Structural and Magnetic Properties." Solid State Phenomena 194 (November 2012): 162–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.194.162.

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The crystal structure of (µ3-Oxo)-hexakis(µ2-cyanoacetato)-triaqua-tri-iron(III) nitrate pentahydrate shows that the trinuclear ferric complex has an equilateral molecular structure which is manifested in the 57Fe Mössbauer spectrum single doublet. The magnetic measurements reveal antiferromagnetic exchange interactions of –22.85 cm-1, between the metal centers, that compel the system to a total spin ground state of S = ½.

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26

Ramamoorthy, Visalakshi, and Paul R. Sharp. "Late-transition-metal .mu.-oxo and .mu.-imido complexes. 6. Gold(I) imido complexes." Inorganic Chemistry 29, no. 18 (September 1990): 3336–39. http://dx.doi.org/10.1021/ic00343a016.

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27

Elliott, RL, PJ Nichols, and BO West. "Synthesis of Heterobinuclear Oxo-Bridged Compounds of Chromium, Iron, Manganese and Molybdenum." Australian Journal of Chemistry 39, no. 7 (1986): 975. http://dx.doi.org/10.1071/ch9860975.

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The synthesis of a series of heterobinuclear oxo -bridged compounds has been accomplished by redox reactions between FeII or MnII complexes of pentadentate and tetradentate salicylideneimines and thiosalicylideneimines and bidentate dithiocarbamates and either CrIVO ( tpp )( tpp ≡ dianion of 5,10,15,20-tetraphenylporphyrin) or MoVI (O)2( dtc )2 ( dtc ≡ diethyldithiocarbamato anion). The compounds are stable in solution in the absence of air but yield various homonuclear derivatives of the metals in its presence, these results indicating a degree of disproportionation of the oxo complexes. The compounds show reduced magnetic moments in line with magnetic coupling between the metal centres.

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28

Bhale, S. P., A. R. Yadav, S. U. Tekale, R. B. Nawale, R. P. Marathe, P. S. Kendrekar, and R. P. Pawar. "Synthesis, Characterization and Antimicrobial Screening of Novel Hydrazide Ligand & It’s Transition Metal Complexes." Asian Journal of Chemistry 31, no. 4 (February 27, 2019): 938–42. http://dx.doi.org/10.14233/ajchem.2019.21795.

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Different transition metal complexes were synthesized from novel 3-bromo-2-[1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)ethylidene]hydrazide ligand (H2L) and characterized by spectral techniques. The synthesized ligand was found to act mono as well as di deprotonated (OH, NH) manner and stoichiometry of the ligand to metal ions was confirmed to be 1:1 in case of complex using metal chloride salts, whereas 1:2 in case of metal(II) complexes using metal acetate(II) salt. Structures of metal complexes were confirmed by IR, 1H NMR, TGA, XRD, elemental analysis and UV technique which revealed that Mn(II), Co(II), Ni(II), Cu(II) complexes were octahedral geometry and those of Cu(II), Zn(II) showed square planner and tetrahedral geometry around metal ion respectively. Furthermore H2L and its metal complexes were screened for antimicrobial activity which showed that ligand enhanced its biological activity after coordination with metal ions. In particular, Cd(II) and Mn(II) complexes exhibited excellent antifungal activity.

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29

Bellemin-Laponnaz, Stéphane, and Jean-Pierre Le Ny. "Metal oxo complexes as catalysts for the isomerisation of allylic alcohols." Comptes Rendus Chimie 5, no. 4 (April 2002): 217–24. http://dx.doi.org/10.1016/s1631-0748(02)01371-1.

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30

Sacramento, Jireh Joy D., and David P. Goldberg. "Factors Affecting Hydrogen Atom Transfer Reactivity of Metal–Oxo Porphyrinoid Complexes." Accounts of Chemical Research 51, no. 11 (November 7, 2018): 2641–52. http://dx.doi.org/10.1021/acs.accounts.8b00414.

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31

Ray, Kallol, Florian Heims, and Florian Felix Pfaff. "Terminal Oxo and Imido Transition-Metal Complexes of Groups 9-11." European Journal of Inorganic Chemistry 2013, no. 22-23 (June 25, 2013): 3784–807. http://dx.doi.org/10.1002/ejic.201300223.

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32

Guo, Jia-Yi, Yuk-Chi Chan, Yongxin Li, Rakesh Ganguly, and Cheuk-Wai So. "Oxo-Bridged Bis(group 4 metal unsymmetric phosphonium-stabilized carbene) Complexes." Organometallics 34, no. 7 (March 16, 2015): 1238–44. http://dx.doi.org/10.1021/om5012962.

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33

Gupta, Rupal, Taketo Taguchi, Benedikt Lassalle-Kaiser, Emile L. Bominaar, Junko Yano, Michael P. Hendrich, and A. S. Borovik. "High-spin Mn–oxo complexes and their relevance to the oxygen-evolving complex within photosystem II." Proceedings of the National Academy of Sciences 112, no. 17 (April 7, 2015): 5319–24. http://dx.doi.org/10.1073/pnas.1422800112.

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The structural and electronic properties of a series of manganese complexes with terminal oxido ligands are described. The complexes span three different oxidation states at the manganese center (III–V), have similar molecular structures, and contain intramolecular hydrogen-bonding networks surrounding the Mn–oxo unit. Structural studies using X-ray absorption methods indicated that each complex is mononuclear and that oxidation occurs at the manganese centers, which is also supported by electron paramagnetic resonance (EPR) studies. This gives a high-spin MnV–oxo complex and not a MnIV–oxy radical as the most oxidized species. In addition, the EPR findings demonstrated that the Fermi contact term could experimentally substantiate the oxidation states at the manganese centers and the covalency in the metal–ligand bonding. Oxygen-17–labeled samples were used to determine spin density within the Mn–oxo unit, with the greatest delocalization occurring within the MnV–oxo species (0.45 spins on the oxido ligand). The experimental results coupled with density functional theory studies show a large amount of covalency within the Mn–oxo bonds. Finally, these results are examined within the context of possible mechanisms associated with photosynthetic water oxidation; specifically, the possible identity of the proposed high valent Mn–oxo species that is postulated to form during turnover is discussed.

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34

Griffith, William P., and Jennifer M. Jolliffe. "Studies on transition-metal nitrido and oxo complexes. Part 14. Carboxylato oxo-osmium(VI) and -ruthenium(VI) complexes and their reactions." Journal of the Chemical Society, Dalton Transactions, no. 24 (1992): 3483. http://dx.doi.org/10.1039/dt9920003483.

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35

Singh, Kiran, Yogender Kumar, Parvesh Puri, Chetan Sharma, and Kamal Rai Aneja. "Thermal, Spectral, Fluorescence, and Antimicrobial Studies of Cobalt, Nickel, Copper, and Zinc Complexes Derived from 4-[(5-Bromo-thiophen-2-ylmethylene)-amino]-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine." International Journal of Inorganic Chemistry 2012 (August 2, 2012): 1–9. http://dx.doi.org/10.1155/2012/873232.

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A new series of cobalt, nickel, copper, and zinc complexes of bidentate Schiff base derived from the condensation of 5-bromothiophene-2-carboxaldehyde with 4-amino-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine were synthesized. Physical (magnetic measurements, molar conductance, TG), spectral (UV-Vis, IR, 1HNMR, fluorescence, ESR), and analytical data have established the structures of synthesized Schiff base and its metal complexes. The presence of coordinated water in metal complexes was confirmed by IR and TG studies. The Schiff base exhibits a strong fluorescence emission, contrast to this partial fluorescence quenching phenomena is observed in its metal complexes. A square planar geometry for Cu(II) and octahedral geometry for Co(II), Ni(II) and Zn(II) complexes have been proposed. The Schiff base and its metal complexes have been screened for antibacterial (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and antifungal activities (Aspergillus niger, A. flavus).

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36

Dawara, Latika, S. C. Joshi, and R. V. Singh. "Synthesis, Characterization, and Antimicrobial and Antispermatogenic Activity of Bismuth(III) and Arsenic(III) Derivatives of Biologically Potent Nitrogen and Sulfur Donor Ligands." International Journal of Inorganic Chemistry 2012 (April 22, 2012): 1–9. http://dx.doi.org/10.1155/2012/372141.

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A series of Bi(III) and As(III) complexes with two N∩S donor ligands, 1-(4-chloro-2-oxo-2H-chromen-3-yl)-methylene)-thiosemicarbazide (L1H) and N′-[1-(2-oxo-2H-chrome-3yl-ethylidene]-hydrazinecarbodithionic acid benzyl ester (L2H) have been synthesized by the reaction of BiCl3 and Ph3As with ligands in 1 : 1 and 1 : 2 molar ratios. All the synthesized compounds were characterized by elemental analyses, melting point determinations, and a combination of electronic, IR, 1H NMR, 13C NMR spectroscopic techniques, and X-ray diffraction for structure elucidation. In order to evaluate the effect of metal ions upon chelation, both the ligands and their complexes have been screened for their antimicrobial activity against the various pathogenic bacterial and fungal strains. The metal complexes have shown to be more antimicrobial against the microbial species as compared to free ligands. Both the ligands and their corresponding metal complexes have been tested for their antifertility activity in male albino rats. The marked reduction in sperm motility and density resulted in infertility. Significant alterations were found in biochemical parameters of reproductive organs in treated animals as compared to control group. It is concluded that all these effects may finally impair the fertility of male rats.

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37

Schneider, Joseph E., McKenna K. Goetz, and John S. Anderson. "Statistical analysis of C–H activation by oxo complexes supports diverse thermodynamic control over reactivity." Chemical Science 12, no. 11 (2021): 4173–83. http://dx.doi.org/10.1039/d0sc06058e.

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Statistical analysis of transition metal oxo mediated C–H activation indicates that thermodynamic factors dictate reactivity and that the energetics of proton and electron transfer have effects independent of the free energy of the reaction.

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38

Ratnasamy, Paul, Robert Raja, and Darbha Srinivas. "Novel, benign, solid catalysts for the oxidation of hydrocarbons." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1829 (April 15, 2005): 1001–12. http://dx.doi.org/10.1098/rsta.2004.1538.

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The catalytic properties of two classes of solid catalysts for the oxidation of hydrocarbons in the liquid phase are discussed: (i) microporous solids, encapsulating transition metal complexes in their cavities and (ii) titanosilicate molecular sieves. Copper acetate dimers encapsulated in molecular sieves Y, MCM-22 and VPI-5 use dioxygen to regioselectively ortho -hydroxylate l -tyrosine to l -dopa, phenol to catechol and cresols to the corresponding o -dihydroxy and o -quinone compounds. Monomeric copper phthalocyanine and salen complexes entrapped in zeolite-Y oxidize methane to methanol, toluene to cresols, naphthalene to naphthols, xylene to xylenols and phenol to diphenols. Trimeric μ 3 -oxo-bridged Co/Mn cluster complexes, encapsulated inside Y-zeolite, oxidize para -xylene, almost quantitatively, to terephthalic acid. In almost all cases, the intrinsic catalytic activity (turnover frequency) of the metal complex is enhanced very significantly, upon encapsulation in the porous solids. Spectroscopic and electrochemical studies suggest that the geometric distortions of the complex on encapsulation change the electron density at the metal ion site and its redox behaviour, thereby influencing its catalytic activity and selectivity in oxidation reactions. Titanosilicate molecular sieves can oxidize hydrocarbons using dioxygen when loaded with transition metals like Pd, Au or Ag. The structure of surface Ti ions and the type of oxo-Ti species generated on contact with oxidants depend on several factors including the method of zeolite synthesis, zeolite structure, solvent, temperature and oxidant. Although, similar oxo-Ti species are present on all the titanosilicates, their relative concentrations vary among different structures and determine the product selectivity.

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39

Silva-Caldeira, Priscila Pereira, Antônio Carlos Almendagna de Oliveira Junior, and Elene Cristina Pereira-Maia. "Photocytotoxic Activity of Ruthenium(II) Complexes with Phenanthroline-Hydrazone Ligands." Molecules 26, no. 7 (April 6, 2021): 2084. http://dx.doi.org/10.3390/molecules26072084.

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This paper reports on the synthesis and characterization of two new polypyridyl-hydrazone Schiff bases, (E)-N′-(6-oxo-1,10-phenanthrolin-5(6H)-ylidene)thiophene-2-carbohydrazide (L1) and (E)-N′-(6-oxo-1,10-phenanthrolin-5(6H)-ylidene)furan-2-carbohydrazide (L2), and their two Ru(II) complexes of the general formula [RuCl(DMSO)(phen)(Ln)](PF6). Considering that hydrazides are a structural part of severa l drugs and metal complexes containing phenanthroline derivatives are known to interact with DNA and to exhibit antitumor activity, more potent anticancer agents can be obtained by covalently linking the thiophene acid hydrazide or the furoic acid hydrazide to a 1,10-phenanthroline moiety. These ligands and the Ru(II) complexes were characterized by elemental analyses, electronic, vibrational, 1H NMR, and ESI-MS spectroscopies. Ru is bound to two different N-heterocyclic ligands. One chloride and one S-bonded DMSO in cis-configuration to each other complete the octahedral coordination sphere around the metal ion. The ligands are very effective in inhibiting cellular growth in a chronic myelogenous leukemia cell line, K562. Both complexes are able to interact with DNA and present moderate cytotoxic activity, but 5 min of UV-light exposure increases cytotoxicity by three times.

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40

Philip, Surya, Soosan Thomas, and K. Mohanan. "Synthesis, fluorescent studies, antioxidative and α-amylase inhibitory activity evaluation of some lanthanide(III) complexes." Journal of the Serbian Chemical Society 83, no. 5 (2018): 561–74. http://dx.doi.org/10.2298/jsc180918010p.

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A novel heterocyclic ligand, viz. 1,2-dihydro-1,5-dimethyl-4-[[1-2- -oxo-2H-1-benzopyran-3-yl)ethylidene]amino]-2-phenyl-3H-pyrazol-3-one, was prepared by condensing 3-acetylcoumarin with 4-aminoantipyrine. This ligand is versatile in forming complexes with lanthanum(III), praseodymium(III), samarium(III), gadolinium(III) and dysprosium(III) ions. The ligand and the metal complexes were characterized through various physicochemical and spectral studies. The spectral studies revealed that the ligand is coordinated to the metal ion in a bidentate fashion, through the azomethine nitrogen and the oxygen atom of the pyrazolone ring. The powder XRD patterns of ligand and the dysprosium(III) complex were studied. The photoluminescent properties of ligand and metal complexes were evaluated and the relative quantum yields were determined. It was observed that in all cases the metal ions enhanced the luminescence intensity. The ?-amylase inhibitory activity of the ligand and the metal complexes was evaluated using the method of Apostolidis. The metal complexes exhibited increased activity compared to the ligand. The antioxidant property was also examined using the DPPH assay and the metal complexes were found to be more potent antioxidants than the ligand.

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41

Bugris, V., Cs Dudás, B. Kutus, V. Harmat, K. Csankó, S. Brockhauser, I. Pálinkó, Peter Turner, and P. Sipos. "Crystal and solution structures of calcium complexes relevant to problematic waste disposal: calcium gluconate and calcium isosaccharinate." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 74, no. 6 (November 14, 2018): 598–609. http://dx.doi.org/10.1107/s2052520618013720.

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The single-crystal structures of calcium D-gluconate and calcium α-D-isosaccharinate have been determined using X-ray diffraction at 100 K. Surprisingly, given its significance in industrial and medical applications, the structure of calcium D-gluconate has not previously been reported. Unexpectedly, the gluconate crystal structure comprises coordination polymers. Unusually, the calcium coordination number is nine. Adjacent metal centres are linked by three μ-oxo bridges, with a metal–metal separation of 3.7312 (2) Å. One of the gluconate ligands contradicts a suggestion from 1974 that a straight chain conformation is associated with an intramolecular hydrogen bond. This ligand binds to three adjacent metal centres. The use of synchrotron radiation provided an improved crystal structure with respect to that previously reported for the isosaccharinate complex, allowing the location of the hydroxy hydrogen sites to be elucidated. In contrast to the gluconate structure, there are no μ-oxo bridges in the isosaccharinate coordination polymer and the isosaccharinate bridging coordination is such that the distance between adjacent metal centres, each of which is eight-coordinate, is 6.7573 (4) Å. Complementing the crystal structure determinations, modelling studies of the geometries and coordination modes for the aqueous [CaGluc]+ and [CaIsa]+ complexes are presented and discussed.

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42

Kavitha, Palakuri, and K. Laxma Reddy. "Synthesis, Structural Characterization, and Biological Activity Studies of Ni(II) and Zn(II) Complexes." Bioinorganic Chemistry and Applications 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/568741.

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Ni(II) and Zn(II) complexes were synthesized from tridentate 3-formyl chromone Schiff bases such as 3-((2-hydroxyphenylimino)methyl)-4H-chromen-4-one (HL1), 2-((4-oxo-4H-chromen-3-yl)methylneamino)benzoic acid (HL2), 3-((3-hydroxypyridin-2-ylimino)methyl)-4H-chromen-4-one (HL3), and 3-((2-mercaptophenylimino)methyl)-4H-chromen-4-one (HL4). All the complexes were characterized in the light of elemental analysis, molar conductance, FTIR, UV-VIS, magnetic, thermal, powder XRD, and SEM studies. The conductance and spectroscopic data suggested that, the ligands act as neutral and monobasic tridentate ligands and form octahedral complexes with general formula [M(L1–4)2]·nH2O (M = Ni(II) and Zn(II)). Metal complexes exhibited pronounced activity against tested bacteria and fungi strains compared to the ligands. In addition metal complexes displayed good antioxidant and moderate nematicidal activities. The cytotoxicity of ligands and their metal complexes have been evaluated by MTT assay. The DNA cleavage activity of the metal complexes was performed using agarose gel electrophoresis in the presence and absence of oxidant H2O2. All metal complexes showed significant nuclease activity in the presence of H2O2.

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43

Hao, Jingjun, Jianfeng Li, Chunming Cui, and Herbert W. Roesky. "Synthesis and Characterization of Heterobimetallic Oxo-Bridged Aluminum–Rare Earth Metal Complexes." Inorganic Chemistry 50, no. 16 (August 15, 2011): 7453–59. http://dx.doi.org/10.1021/ic2010584.

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44

Betley, Theodore A., Qin Wu, Troy Van Voorhis, and Daniel G. Nocera. "Electronic Design Criteria for O−O Bond Formation via Metal−Oxo Complexes." Inorganic Chemistry 47, no. 6 (March 2008): 1849–61. http://dx.doi.org/10.1021/ic701972n.

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45

Haunschild, Robin, and Gernot Frenking. "Ethylene addition to group-6 transition metal oxo complexes – A theoretical study." Journal of Organometallic Chemistry 693, no. 4 (February 2008): 737–49. http://dx.doi.org/10.1016/j.jorganchem.2007.12.008.

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Brower, D. C., Joseph L. Templeton, and D. M. P. Mingos. "Metal d.pi.-ligand .pi. conflicts in octahedral oxo, carbyne, and carbonyl complexes." Journal of the American Chemical Society 109, no. 17 (August 1987): 5203–8. http://dx.doi.org/10.1021/ja00251a026.

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47

Kudyakova, Yu S., M. V. Goryaeva, Ya V. Burgart, and V. I. Saloutin. "New chiral metal complexes based on 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates." Russian Journal of Organic Chemistry 47, no. 3 (March 2011): 331–39. http://dx.doi.org/10.1134/s107042801103002x.

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48

Borovik, A. S. "Role of metal–oxo complexes in the cleavage of C–H bonds." Chemical Society Reviews 40, no. 4 (2011): 1870. http://dx.doi.org/10.1039/c0cs00165a.

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49

Ali, Omyma A. M., Mostafa M. H. Khalil, Gehad M. Attia, and Ramadan M. Ramadan. "Group VI Dinuclear Oxo Metal Complexes of Salicylideneimine‐2‐anisole Schiff Base." Spectroscopy Letters 36, no. 1-2 (January 5, 2003): 71–82. http://dx.doi.org/10.1081/sl-120021174.

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50

Fukuzumi, Shunichi. "ChemInform Abstract: Electron Transfer and Catalysis with High-Valent Metal-Oxo Complexes." ChemInform 46, no. 21 (May 2015): no. http://dx.doi.org/10.1002/chin.201521247.

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