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Journal articles on the topic 'Ethyl ligand'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Kumar, Sushil, Shweta Soam, Sulekh Chandra, and Hariom Kumar Kaushik. "AZAMACROCYCLIC Cr(III) COMPLEXES: SYNTHESIS AND SPECTROSCOPIC STUDIES." RASAYAN Journal of Chemistry, Special Issue (2022): 280–84. http://dx.doi.org/10.31788/rjc.2022.1558155.

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The new tetra dentate aza-macrocyclic ligands LA prepared by 2,6 –diamino pyridine and 3-methyl-2,4-pentadione, Ligand LB prepared by 2,6-diamino-pyridine and 3-ethyl-2,4-pentadione, Ligand LC was prepared with the reaction of 5-bromo-2,3-diamino-pyridine with. 3-methyl-2,4-pentadione and Ligand LD were prepared with the reaction of 5-bromo-2,3-diamino-pyridine with 3-ethyl-2,4-pentadione. Ethyl Alcohol was used in the preparation of ligands as a solvent. All the Ligands were characterized with the help of elemental and spectral studies. Cr(III) complexes were prepared with these newly synthes

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2

Miecznikowski, John R., Olivier J. C. Nicaise, Brandon Q. Mercado, et al. "Synthesis and Characterization of ONO Pincer Ligand Precursors and Metal Complexes with Ethyl, Isopropyl and Tert-Butyl Wingtip Groups." Crystals 15, no. 3 (2025): 227. https://doi.org/10.3390/cryst15030227.

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We have synthesized novel cobalt(II) and nickel(II) pincer ligand complexes containing novel tridentate ligand precursors that coordinate via oxygen, nitrogen, and oxygen donor atoms. The novel tridentate ONO ligands, which are neutral, incorporate a carbonyl-substituted imidazole functionality and contain R groups of ethyl, isopropyl, or tert-butyl. The ligand precursors were thoroughly characterized using NMR spectroscopy, ESI-MS, and IR spectroscopy. The metal complexes were thoroughly characterized using single crystal X-ray diffraction, elemental analysis, ESI-MS, and cyclic voltammetry.

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3

Aragay, Gemma, Josefina Pons, Jordi García-Antón, et al. "Synthesis and Characterization of New Palladium(II) Complexes Containing N-Alkylamino-3,5-diphenylpyrazole Ligands. Crystal Structure of [PdCl(L2)](BF4) {L2 = Bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine}." Australian Journal of Chemistry 62, no. 5 (2009): 475. http://dx.doi.org/10.1071/ch08521.

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In this paper, the synthesis of two new N,N′,N-ligands, bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]amine (L1) and bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine (L2) is reported. These ligands form complexes with the formula [PdCl(N,N′,N)]Cl when reacting with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio. Treatment of these ligands with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio in the presence of AgBF4 or NaBF4 gave [PdCl(N,N′,N)](BF4) complexes. These PdII complexes were characterized by elemental analyses, conductivity measurements, mass spectrometry, and IR, 1H, and 13C{1H}

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4

Hong, Jun. "catena-Poly[[bis(1-ethyl-1H-imidazole)copper(II)]-μ-benzene-1,3-dicarboxylato]". Acta Crystallographica Section E Structure Reports Online 63, № 11 (2007): m2671. http://dx.doi.org/10.1107/s1600536807047976.

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In the title compound, [Cu(C8H4O4)(C5H8N2)2] n , each CuII atom (site symmetry \overline{1}) is four-coordinated by two carboxylate O atoms from two different benzene-1,3-dicarboxylate ligands and two N atoms from two 1-ethyl-1H-imidazole ligands in a trans-CuN2O2 square-planar arrangement. Each benzene-1,3-dicarboxylate ligand, which possesses crystallographic twofold rotation symmetry, links two adjacent CuII atoms in a bis-monodentate mode, resulting in a chain with the 1-ethyl-1H-imidazole ligands attached on both sides.

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5

Stritt, Anika, E. Alper Ünal, Elisabeth Irran, and Andreas Grohmann. "“Coordination caps” of graded electron-donor capacity." Zeitschrift für Naturforschung B 79, no. 12 (2024): 705–22. https://doi.org/10.1515/znb-2024-0093.

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Abstract An efficient synthesis of the novel {6-[1,1-di(pyridin-2-yl)ethyl]pyridine-2-yl}2-methyl-1,3-propanediamine (2) is reported, as well as a reliable large-scale synthesis (of the order of 100 g) of previously known 2,2’-[1-(6-chloropyridin-2-yl)ethane-1,1-diyl]dipyridine (4); the latter is the starting material for the preparation of the former, as well as a multitude of other polypodal polyamine/polyimine ligands. Both materials, as well as the intermediates in their multi-step syntheses, have been fully characterised. Ligand 2, in conjunction with ligands 2,2’-(pyridine-2,6-diyl)bis(2

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6

Głuszyńska, Agata, and Bernard Juskowiak. "Practical Microwave Synthesis of Carbazole Aldehydes for the Development of DNA-Binding Ligands." Molecules 24, no. 5 (2019): 965. http://dx.doi.org/10.3390/molecules24050965.

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Microwave formylation of carbazole derivatives was investigated and 3-monoaldehydes were obtained in high yield. A potential DNA-binding ligand, 3-[(3-ethyl)-2-vinylbenzothiazolium]-9-N-ethyl carbazole iodide, was synthesized and characterized including spectral properties (UV-Vis absorption and fluorescence spectra). The binding selectivity and affinity of three carbazole ligands for double-stranded and G-quadruplex DNA structures were studied using a competitive dialysis method in sodium- and potassium-containing buffer solutions.

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7

Brunner, Henri, Andreas Winter, and Bernhard Nuber. "Asymmetrische Katalysen, 116. Triaza-und Tetraaza-Makrocyclen mit chiralen "pendant arms" in der enantio- selektiven Cyclopropanierung / Asymmetrie Catalyses, 116. Triaza and Tetraaza Macrocycles with Chiral Pendant Arms in the Enantioselective Cyclopropanation." Zeitschrift für Naturforschung B 52, no. 11 (1997): 1436–38. http://dx.doi.org/10.1515/znb-1997-1123.

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The chiral ligands 1 - 5 were tested in the Cu1- catalyzed enantioselective cyclopropanation of styrene with ethyl diazoacetate. The new ligand 5 was synthesized by reaction of 1,4,8,11-tetraazacyclotetradecane (cyclam ) with (S)-propylene oxide and characterized by X-ray analysis.

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8

Mendoza, María de los Angeles, Sylvain Bernès, and Guillermo Mendoza-Díaz. "Coordination of bis(pyrazol-1-yl)amine to palladium(II): influence of the co-ligands and counter-ions on the molecular and crystal structures." Acta Crystallographica Section E Crystallographic Communications 71, no. 1 (2015): 22–27. http://dx.doi.org/10.1107/s205698901402595x.

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The structures of a series of complexes with general formulan[Pd(pza)X]Y·mH2O (n= 1, 2;X= Cl, Br, I, N3, NCS;Y= NO3, I, N3, [Pd(SCN)4];m= 0, 0.5, 1) have been determined, where pza is the tridentate ligand bis[2-(3,5-dimethylpyrazol-1-yl)ethyl]amine, C14H23N5. In all complexes, {bis[2-(3,5-dimethylpyrazol-1-yl-κN2)ethyl]amine-κN}chloridopalladium nitrate, [Pd(pza)Cl]NO3, (1), {bis[2-(3,5-dimethylpyrazol-1-yl-κN2)ethyl]amine-κN}bromidopalladium nitrate, [Pd(pza)Br]NO3, (2), {bis[2-(3,5-dimethylpyrazol-1-yl-κN2)ethyl]amine-κN}iodidopalladium iodide hemihydrate, [Pd(pza)I]I·0.5H2O, (3), azido{bis

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9

Abbas Ali, Wissam, Hayder Mihsen, and Sajid H. Guzar. "Synthesis, Characterization and Antibacterial Activity of Sn(II) and Sn(IV) Ions Complexes Containing N-Alkyl-N-Phenyl Dithiocarbamate Ligands." Chemistry & Chemical Technology 17, no. 4 (2023): 729–39. http://dx.doi.org/10.23939/chcht17.04.729.

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In the current study, ligands S2 donor atoms, sodium N-methyl-N-phenyldithiocarbamate [L1], and sodium N-ethyl-N-phenyldithiocarbamate [L2] are prepared from carbon disulfide with N-methyl aniline and N-ethyl aniline, respectively. Sn(II) and Sn(IV) ions complexes containing N-alkyl-N-Phenyl dithiocarbamateare prepared and characterized by CHNS elemental analysis, infrared spectroscopy (FT-IR), 1HNMR-spectroscopy, mass spectroscopy, UV-visible spectroscopy, magnetic susceptibility and conductivity measurements. The analytical and spectral data show that the stoichiometry for all complexes is 1

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10

Zou, D. H., M. Liang, and W. Chen. "SYNTHESIS, X-RAY CRYSTAL STRUCTURES AND CATALYTIC EPOXIDATION OF OXIDOVANADIUM(V) COMPLEXES DERIVED FROM N’-(5-CHLORO-2-HYDROXYBENZYLIDENE)-3-METHYLBENZOHYDRAZIDE." Журнал структурной химии 65, no. 10 (2024): 133818. http://dx.doi.org/10.26902/jsc_id133818.

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An aroylhydrazone compound N’-(5-chloro-2-hydroxybenzylidene)-3-methylbenzohydrazide (H2L) has been synthesized and characterized by elemental analysis, infrared and electronic spectra, and 1H NMR spectrum. With the aroylhydrazone and maltol (HLa) or ethyl maltol (HLb) as ligands, two oxidovanadium(V) complexes, [VOLLa] (1) and [VOLLb] (2), have been synthesized and characterized by elemental analysis, infrared and electronic spectra, and 1H NMR spectra. Structures of the complexes were further confirmed by single crystal X-ray determination. The V atoms in the complexes are coordinated by the

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11

Ferraz de Paiva, Raphael Enoque, Douglas Hideki Nakahata, Marcos Alberto de Carvalho, Fernando Rodrigues Goulart Bergamini, and Pedro Paulo Corbi. "N,N′,N′′versus N,N′,Oimine-containing coordination motifs: ligand-directed synthesis of mononuclear and binuclear CuIIcompounds." Acta Crystallographica Section E Crystallographic Communications 73, no. 10 (2017): 1563–67. http://dx.doi.org/10.1107/s2056989017013652.

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It is demonstrated here that tridentate imine ligands can control the nuclearity of copper(II) complexes based on the donor atoms present in the ligand. TheN,N′,N′′-donating imine ligand led to a mononuclear compound, namely dichlorido[N,N-dimethyl-N′-(pyridin-2-ylmethylidene)ethane-1,2-diamine]copper(II) monohydrate, [CuCl2(C10H15N3)]·H2O,1, while theN,N′,O-donating imine ligand produced a binuclear metal complex, namely μ2-chlorido-dichlorido(μ2-2-{[2-(dimethylamino)ethyl]iminomethyl}phenolato)(N,N-dimethylethylenediamine)dicopper(II) 0.11-hydrate, [Cu2(C11H15N2O)Cl3(C4H12N2)]·0.11H2O,2. The

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12

Barus, Andre Anusta, and Chinpiao Chen. "Enantioselective Synthesis of 2,3-Dihydrofurans Using the Catalyst of Camphor/Pinene-Based Bypiridine." J-HEST Journal of Health Education Economics Science and Technology 5, no. 1 (2022): 148–56. http://dx.doi.org/10.36339/jhest.v5i1.92.

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This research describes the synthesis of two kinds of chiral ligand and their application in the cyclization of 2,3-dihydrofuran. They are camphor-based bipyridine and pinene-based bipyridine. These ligands were prepared followed the known procedure, and they were used for the enantioselective preparation of 2,3-dihydrofuran in the present of enone and ethyl bromoacetate. Ligand that gives the highest enantioselectivity value is pinene bipyridine-salt with 56% ee for cis isomer (86% yield) while 30% ee is obtained for trans isomer of 2,3-dihydrofuran (1/3).

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13

R., C. MAURYA, D. MISHRA D., JAISWAL S., and B. KHAN J. "Synthesis and Characterisation some Mixed-Ligand Cyanonitrosyl {CrNO}5 Complexes of Chromium(I) with some Aniline and 2-Pyrazolin-5-one Derivatives." Journal of Indian Chemical Society Vol. 69, Dec 1992 (1992): 801–3. https://doi.org/10.5281/zenodo.6017694.

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Coordination Chemistry Laboratory, Department of P. G. Studies and Research in Chemistry, R. D. University, Jabalpur-482 001 <em>Manuscript received 4 May 1990, revised 12 August 1992, accepted 18 August 1992</em> Mixed-ligand hexacoordinated cyanonitrosyl {CrNO}<sup>5</sup> complexes of chromium(I) of the compositions, Cr(NO) (CN)<sub>2</sub>(L)2 (H<sub>2</sub>O)] (where L=<em>N</em>-methylaniline, <em>N</em>-ethyl-<em>o</em>-toluidine, <em>N</em>-ethyl-<em>p</em>-tolnidine,<em> N,N</em>-dimethyl-<em>m</em>-toluidine or <em>N</em>-benzyl-<em>N</em>-ethylaniline) and [Cr(NO) (CN)<sub>2</s

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14

N., K. ROY, and BANERJEE (DUTTA) B. "Polarographic Studies of 1-Amidino-2-thiourea (HATU) Complexes of Copper(Il), Nickel(Il) and Cobalt(III)." Journal of Indian Chemical Society Vol. 62, Apr 1985 (1985): 284–85. https://doi.org/10.5281/zenodo.6324694.

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Department of Chemistry, Indian Institute of Technology, Kharagpur-721 302 <em>Manuscript received 23 November 1983, revised 25 September 1984, accepted 30 April 1985</em> Polarographic studies of complexes of Cu<em><sup>II</sup></em>, Ni<em><sup>II</sup></em> and Co<em><sup>III</sup> </em>with ligands <em>S</em>-methyl-1-amidino-2-thiourea (HSMATU), <em>S</em>-ethyl-1-amidino-2-thiourea (HSEATU), <em>N </em>methyl-1-amidino-2-thiourea (HNMATU) and N-ethyl-1-amidino-2-thiourea (HNEATU) have been carried out <em>Bis </em>(ligand) complexes of copper S-alkyl-1-amidino-2- thiourea

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15

Wulff, William D., Yong Guan, Zhenjie Lu, Xiaopeng Yin, Aliakbar Mohammadlou, and Richard J. Staples. "Catalytic Asymmetric Aziridination of Benzhydryl Imines and Diazoacetate Esters with BOROX Catalysts from 3,3′-Disubstituted VANOL Ligands." Synthesis 52, no. 14 (2020): 2073–91. http://dx.doi.org/10.1055/s-0039-1690860.

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This work details the synthesis of 22 new chiral VANOL ligands that differ by the nature of the substituent in the 3- and 3′-positions of the ligand. These ligands were incorporated into boroxinate catalysts that were used to screen the catalytic asymmetric aziridination of benzhydryl imines with ethyl diazoacetate. Each catalyst was screened in the reaction of imines generated from benzaldehyde and cyclohexanecarboxaldehyde and some with 4-nitro- and 4-methoxybenzaldehyde. In addition, the first report of the effect of the ester substituent of the diazoacetate ester on the asymmetric inductio

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16

Yu, Yang, Yuan Liu, Aoxia Liu, Hexin Xie, Hao Li, and Wei Wang. "Ligand-free Cu-catalyzed [3 + 2] cyclization for the synthesis of pyrrolo[1,2-a]quinolines with ambient air as a terminal oxidant." Organic & Biomolecular Chemistry 14, no. 31 (2016): 7455–58. http://dx.doi.org/10.1039/c6ob01316c.

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A ligand-free Cu-catalyzed [3 + 2] cycloaddition of ethyl 2-(quinolin-2-yl)acetates, ethyl 2-(isoquinolin-1-yl)acetates, and ethyl 2-(pyridin-2-yl)acetates with (E)-chalcones for a “one-pot” synthesis of pyrrolo[1,2-a]quinolines, pyrrolo[2,1-a]isoquinolines and indolizines has been developed.

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17

Hohloch, Stephan, James R. Pankhurst, Esther E. Jaekel, et al. "Benzoquinonoid-bridged dinuclear actinide complexes." Dalton Transactions 46, no. 35 (2017): 11615–25. http://dx.doi.org/10.1039/c7dt02728a.

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18

Amardeep, Vijay Dangi, Pramod Kumar, et al. "Thermodynamic and Global Reactivity Parameter Indices for Catechol Based Dipodal Complex with Trivalent Heavy Metal Ions." Asian Journal of Chemistry 36, no. 7 (2024): 1530–36. http://dx.doi.org/10.14233/ajchem.2024.31621.

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Heavy metal ions are of major concern due to their potential toxicity to humans and environment. Schiff base biomimetic ligands have shown immense potential to mitigate the heavy metal ions toxicity. In present study, the thermodynamic and stability parameters for catechol based Schiff base ligand MEC–trivalent metal ions (Al3+, Cr3+ and Fe3+) complexes (where MEC = N1,N3-bis(2-(((Z)-2,3-dihydroxybenzylidene)amino)ethyl)malonamide) were investigated using DFT and TD-DFT approaches. Further, in order to propose the involvement of these metal-ligand complexes in various applications, the concept

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19

Novara, Francesca R., Xinhao Zhang, Detlef Schröder, and Helmut Schwarz. "Gaseous Ni+ complexes with BINOL derivatives and chiral esters in the gas phase: an experimental and theoretical investigation." Collection of Czechoslovak Chemical Communications 74, no. 2 (2009): 255–73. http://dx.doi.org/10.1135/cccc2008168.

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The gas-phase behavior of monocationic Ni(II) complexes that contain as building blocks optically pure BINOL derivatives and two chiral hydroxy esters is investigated by means of electrospray ionization (ESI) mass spectrometry. Upon collision-induced dissociation (CID), the complexes containing ethyl 2-hydroxypropionate (ethyl lactate) only lose the ester ligand. The complexes bearing ethyl 3-hydroxybutyrate instead either lose the ester ligands or undergo bond activation followed by elimination of the corresponding β-ketoester (ethyl acetylacetate) as revealed by deuterium labeling. Compariso

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20

Brunner, Henri, Friedrich Maiterth, and Barbara Treittinger. "Synthese und Antitumoraktivität von [1,2-Diamino-1-(p-hydroxy)benzyl]ethan(dichloro)platin(II)-KomplexenSynthesis and Antitumor Activity of [1,2-Diamino-1-(p-hydroxy)benzyl]ethane(dichloro)platinum(II) Complexes." Zeitschrift für Naturforschung B 47, no. 7 (1992): 942–46. http://dx.doi.org/10.1515/znb-1992-0708.

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The complexes [1,2-diamino-l-(p-hydroxy)benzyl-1-(methyl, ethyl, and phenyl)]ethane-(dichloro)platinum(II) were synthesized and characterized. The benzylic p-hydroxy group of the 1,2-diaminoethane ligand leads to good water-solubility of the complexes. The ligands were synthesized in a Strecker-type reaction, starting from the corresponding p-methoxybenzylketones. The amino nitriles were reduced to the diamines. Finally, the p-methoxy groups were converted into hydroxy groups by ether cleavage. For the preparation of the complexes, K2PtCl4 was added to the ligands. The antitumor activity of th

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21

Black, DS, GB Deacon, and GL Edwards. "Synthesis of 7-Substituted Indoles as Potential Ligand Precursors." Australian Journal of Chemistry 44, no. 12 (1991): 1771. http://dx.doi.org/10.1071/ch9911771.

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Some 7-(pyridin-2′'-yl)- and 7-(pyrazol-1′-yl)-indole-2-carboxylic esters (14)-(16) and the related acids (17) and (18) have been synthesized through the Fischer indole cyclizations of the ethyl pyruvate hydrazones (9)-(12), which were in turn derived from the ortho -functionalized anilines (5)-(8) by diazotization and coupling with ethyl 2-methyl-3-oxobutanoate (the Japp-Klingemann reaction).

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22

Zlatovic, Mario, Vladimir Sukalovic, Goran Roglic, Sladjana Kostic-Rajacic, and Deana Andric. "The influence of dispersive interactions on the binding affinities of ligands with an arylpiperazine moiety to the dopamine D2 receptor." Journal of the Serbian Chemical Society 74, no. 10 (2009): 1051–61. http://dx.doi.org/10.2298/jsc0910051z.

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Several isosteric 1,3-dihydro-5-[2-(4-aryl-1-piperazinyl)ethyl]-2H-benzimidazole-2-thiones were used to investigate the interactions of different ligands with the binding site of the D2 receptor. Due to limitations of the simulation methods, docking analysis failed to show precisely the interactions that influence the binding affinity of the ligands. It is presumed that dispersive forces or more precisely edge-to-face interactions play an important role in the binding process, especially for the lipophilic part of the ligands. In order to confirm this hypothesis, ab initio calculations were ap

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23

Filipović, Nenad R., Tamara R. Todorović, D. M. Sladić, Irena T. Novaković, D. A. Jeremić, and K. K. Andjelković. "Synthesis, Characterization and Biological Activity Evaluation of Novel Pd(II) and Pt(II) Complexes with Heterocyclic Hydrazone Ligands." Materials Science Forum 555 (September 2007): 423–27. http://dx.doi.org/10.4028/www.scientific.net/msf.555.423.

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New complexes of Pt(II) with condensation derivatives of ethyl hydrazinoacetate and either 2-acetylpyridine or 2-quinolinecarboxaldehyde, and of Pd(II) with the condensation derivative of ethyl hydrazinoacetate and 2-quinolinecarboxaldehyde were synthesized and characterized by elemental analysis, IR, 1H- and 13C-NMR spectroscopy, and molar conductivity measurements. The complexes have a square planar geometry, ligands binding as bidentates in the neutral form, and the remaining two coordination sites being occupied by chloride ions. Biological activity of new complexes, and of previously synt

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24

Rusnac, Anna, Olga Garbuz, Sergiu Şova, and Aurelian Gulea. "Synthesis of new coordination compounds of some 3d metals bazed on N(4)-(ethyl acetate) thiosemicarbazones 2-formil and 2-acetyl pyridine. Antioxidative properties." Akademos, no. 4(67) (March 2023): 19–26. http://dx.doi.org/10.52673/18570461.22.4-67.02.

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The given work includes the description of methods for the synthesis of new coordinative combinations of Cu(II), Mn(II), Fe(III) Co(III), Ni(II) and Zn(II) with N(4)-(ethyl acetate) thiosemicarbazones of 2-formylpyridine and 2-acetylpyridine. The characterization of the newly synthesized compounds was carried out using 1H NMR, 13C NMR, FTIR spectroscopy, conductivity, and elemental analysis. In addition, the structures of N(4)-(ethyl acetate) thiosemicarbazide and N(4)-(ethyl acetate) thiosemicarbazone 2-acetylpyridine (HL2) were determined using single crystal X-ray diffraction. The antioxida

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Edwards, Julia A., Robert McDonald та Lisa F. Szczepura. "Crystal structure of octa-μ3-selenido-(p-toluenesulfonato-κO)pentakis(triethylphosphane-κP)-octahedro-hexarhenium(III)p-toluenesulfonate dichloromethane disolvate". Acta Crystallographica Section E Crystallographic Communications 71, № 9 (2015): m158—m159. http://dx.doi.org/10.1107/s2056989015014334.

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The title compound, [Re6Se8{O3SC6H4(CH3)}{P(C2H5)3}5](CH3C6H4SO3)·2CH2Cl2, contains the face-capped hexanuclear [Re6(μ3-Se)8]2+cluster core. The [Re6Se8]2+cluster core displays a non-crystallographic center of symmetry and is bonded through the ReIIIatoms to five triethylphosphane ligands and onep-toluenesulfonate ligand. Onep-toluenesulfonate counter-ion and two dichloromethane solvent molecules are also present in the asymmetric unit. One of the ethyl chains of one triethylphosphane ligand and one of the CH2Cl2solvent molecules are disordered over two sets of sites (occupancy ratios 0.65:0.3

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26

Ward, Hussein Ali, Taghreed M. Musa, and Zaizafoon Nabil Nasif. "Synthesis and Characterization of some Transition Metals Complexes with new Ligand Azo Imidazole Derivative." Al-Mustansiriyah Journal of Science 33, no. 2 (2022): 31–38. http://dx.doi.org/10.23851/mjs.v33i2.1121.

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AZO complexes synthesized by binding metal ions as Mn(II), Co(II), Ni(II) and Cu(II), with the ligand (L) [ethyl 4-((E)-(5-oxo-1-(((1E,2E)-3-phenylallylidene)amino)-2-thioxo-2,5-dihydro-1H-imidazol-4-yl)diazenyl)benzoate] was prepared from three steps ,first step preparation Schiff base product of condensation reaction by reaction Thiosemicarbazide with cinnamaldeyde, second step preparation the Imidazole ring close by reaction ligand 1 with chloroethylacetate, finally preparation Azo ligand(Diazanium compound) by reaction ligand 2 with benzocain. Characterized the ligands and complexes in the

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Cao, Ruyin, Alejandro Giorgetti, Andreas Bauer, Bernd Neumaier, Giulia Rossetti, and Paolo Carloni. "Role of Extracellular Loops and Membrane Lipids for Ligand Recognition in the Neuronal Adenosine Receptor Type 2A: An Enhanced Sampling Simulation Study." Molecules 23, no. 10 (2018): 2616. http://dx.doi.org/10.3390/molecules23102616.

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Human G-protein coupled receptors (GPCRs) are important targets for pharmaceutical intervention against neurological diseases. Here, we use molecular simulation to investigate the key step in ligand recognition governed by the extracellular domains in the neuronal adenosine receptor type 2A (hA2AR), a target for neuroprotective compounds. The ligand is the high-affinity antagonist (4-(2-(7-amino-2-(furan-2-yl)-[1,2,4]triazolo[1,5-a][1,3,5]triazin-5-ylamino)ethyl)phenol), embedded in a neuronal membrane mimic environment. Free energy calculations, based on well-tempered metadynamics, reproduce

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Hussien, Nasry Jassim, Jasim M. S. Alshawi, Khalid Tuama Abdullah, Enaam I. Yousif, and Mohamad J. Al-Jeboori. "Dimethyltin (IV) complexes of new thiosemicarbazone ligand with piperazine-1-yimethylene moiety: Synthesis, spectral characterization and antibacterial activity." Edelweiss Applied Science and Technology 9, no. 3 (2025): 266–78. https://doi.org/10.55214/25768484.v9i3.5202.

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Three new thiosemicarbazone ligands and their dimethyltin (IV) complexes are reported. The condensation of piperazine-1-carbaldehyde with thiosemicarbazide, 4-methyl-3-thiosemicarbazide, and 4-ethyl-3-thiosemicarbazide was carried out in an ethanol medium using HBr as a catalyst, resulting in the isolation of the ligands (E)-2-(piperazin-1-ylmethylene) hydrazine-1-carbothioamide (HL1), (E)-N-methyl-2-(piperazin-1-ylmethylene) hydrazine-1-carbothioamide (HL2), and (E)-N-ethyl-2-(piperazin-1-ylmethylene) hydrazine-1-carbothioamide (HL3), respectively. The reaction of ligands HL1 - HL3 with dimet

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29

Zou, Dong-Hui, Min Liang, and Wei Chen. "Synthesis, X-Ray Crystal Structures and Catalytic Epoxidation of Oxidovanadium(V) Complexes with Aroylhydrazone and Ethyl Maltolate Ligands." Acta Chimica Slovenica 68, no. 2 (2021): 441–46. http://dx.doi.org/10.17344/acsi.2020.6553.

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Two oxidovanadium(V) complexes, [VOL1L] (1) and [VOL2L] (2) (L = ethyl maltolate), derived from the aroylhydrazones 4-bromo-N’-(2-hydroxy-5-methylbenzylidene)benzohydrazide (H2L1) and N’-(3,5-dibromo-2-hydroxybenzylidene)- 4-methoxybenzohydrazide (H2L2), respectively, have been synthesized and characterized by elemental analysis, infrared and electronic spectroscopy. Structures of the complexes were further confirmed by single crystal X-ray determination. The V atoms in the complexes are coordinated by the ONO donor atoms of the aroylhydrazone ligand, OO donor atoms of the ethyl maltolate liga

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30

Dharmalingam, V., A. K. Ramasamy, and V. Balasuramanian. "Synthesis and EPR Studies of Copper Metal Complexes of Dyes Derived from Remazol Red B, Procino Yellow, Fast Green FCF, Brilliant Cresyl Blue with Copper Acetate Monohydrate." E-Journal of Chemistry 8, s1 (2011): S211—S224. http://dx.doi.org/10.1155/2011/625365.

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The synthesis and characterization of four new solid dye complexes, CuL2(L= 2-[2-methoxy-5-(propane-1-sulfonyl)-phenyl azo]-naphthalen-1-ol, 5-{[3-(4,6-dihydroxy-[1,3,5]tri azine-2-ylamino)-phenyl]-hydrazones}-1-ethyl-4-methyl-2,6-dioxo-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid diethylamide, 4-{bis-[4-(benzyl-ethyl-amino)-phenyl]-methyl}-phenol and 7-imino-4-methyl-7H-phenoxazine-1,3-diamine) is reported. The mode for ligand coordination has been determined by IR and EPR spectra. The carboxyl and amino group of dyes coordinates to the Cu(II) atom as a unidentate or as a chelating ligand.

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31

HARMS, Gesche, Regine KRAFT, Gerlinde GRELLE, Bärbel VOLZ, Jens DERNEDDE, and Rudolf TAUBER. "Identification of nucleolin as a new L-selectin ligand." Biochemical Journal 360, no. 3 (2001): 531–38. http://dx.doi.org/10.1042/bj3600531.

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Apart from leucocyte–endothelial interactions, the adhesion molecule L-selectin mediates the homotypic adhesion of leucocytes during recruitment at sites of acute inflammation, as well as intercellular adhesion of haematopoietic progenitor cells during haematopoiesis. There is evidence that, in addition to P-selectin glycoprotein ligand-1, other as-yet-unidentified proteins function as L-selectin ligands on human leucocytes and haematopoietic progenitor cells. In the present study, we show: (i) by affinity chromatography on L-selectin–agarose; (ii) by protein identification using MS; and (iii)

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32

Bacaita, Elena Simona, Corneliu Sergiu Stan, Maricel Agop, and Gabriela Cioca. "Spectral Properties of HEMA/poly(HEMA) as Ligand in Luminescent Europium Based Complexes Through Computational Investigation." Revista de Chimie 69, no. 9 (2018): 2430–34. http://dx.doi.org/10.37358/rc.18.9.6547.

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This paper investigates, through computational methods, the spectral properties of (2-hydroxy ethyl) methacrylate used as ligand in a luminescent complex based on europium, aiming to show that the absorption spectra is determined by the ligand type and the emission spectra is specific for each lanthanide.

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Rusanova, Julia A., та Dmytro Bederak. "Crystal structure of bis(μ2-4-bromo-2-[({2-[({2-[(5-bromo-2-oxidobenzylidene)amino]ethyl}sulfanyl)sulfonyl]ethyl}imino)methyl]phenolato)dicopper(II) dimethylformamide disolvate". Acta Crystallographica Section E Crystallographic Communications 73, № 11 (2017): 1797–800. http://dx.doi.org/10.1107/s2056989017015584.

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The title dinuclear copper(II) complex [Cu2(C18H16Br2N2O4S2)2] was prepared by direct synthesis of a dianionic Schiff base derived from 5-bromosalicylaldehyde and cysteamine. The discrete molecules lie across inversion centers and crystallize with two dimethylformamide (DMF) molecules of crystallization. The unique CuIIion is four-coordinated by two tetradentate Schiff base ligands in a distorted square-planar N2O2environment. In the crystal, short intermolecular S...Br contacts, weak C—H...O hydrogen bonds and intra- and intermolecular π–π stacking interactions between rings of the ligand lin

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34

Ovalle, Saúl, Perla Elizondo Martínez, Nancy Pérez Rodríguez, Sylvain Bernès, and Marcos Flores-Alamo. "Tris[2-(2H-indazol-2-yl)ethyl]amine." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (2012): o1879—o1880. http://dx.doi.org/10.1107/s1600536812022027.

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The title tertiary amine, C27H27N7, a potential tripodal ligand for coordination chemistry, crystallizes with the central N atom located on a threefold axis of a trigonal cell. The gauche conformation of the N(amime)—CH2—CH2—N(indazole) chain [torsion angle = −64.2 (2)°] places the pendant 2H-indazole heterocycles surrounding the symmetry axis, affording a claw-like shaped molecule. Two symmetry-related indazole planes in the molecule make an acute angle of 60.39 (4)°. The lone pair of the tertiary N atom is located inside the cavity, and should thus be inactive (as a ligand). In the crystal,

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35

Kraudelt, Heide, Uwe Schilde, Heike Hefele, Eberhard Ludwig, and Erhard Ludwig. "Titan- und Vanadiumkomplexe mit 4-[1-(N′-Benzoylhydrazino)-l-phenylmethyliden]- 3-methyl-1-phenyl-pyrazol-5-on. Röntgenkristallstruktur von 4-[1-(N′-Benzoylhydrazino)-1-phenyl-methyliden]-3-methyl-1-phenyl- pyrazol-5-on / Titanium- and Vanadium Complexes of 4-[1-(N′-Benzoylhydrazino)-1-phenylmethylidene]-3-methyl-1-phenyl-pyrazol-5-one. Structure of 4-[1-(N′-Benzoylhydrazino)-1-phenyl-methylidene]-3-methyl-1-phenyl-pyrazol-5-one." Zeitschrift für Naturforschung B 51, no. 9 (1996): 1240–44. http://dx.doi.org/10.1515/znb-1996-0905.

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By reaction of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one with benzoylhydrazine the tridentate diacidic ligand 4-[1-(N′-benzoylhydrazino)-1-phenyl-m ethylidene]-3-m ethyl-lphenyl-1-pyrazol-5-one (H2L) is formed which gives complexes ML2 with tetravalent titanium and vanadium ions. The ligand and its complexes were characterized by mass spectroscopy. The vanadium(IV) complex can be oxidised and reduced electrochemicallv. The chemical bonding in the titanium(IV) complex and in the ligand was studied by IR and 13C NMR spectroscopy.The molecular structure of 4-[1-(N′-benzoylhydrazino)-1-phenyl-meth

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36

Idemudia, Omoruyi G., та Eric C. Hosten. "Bis(4-benzoyl-3-methyl-1-phenyl-1H-pyrazol-5-olato-κ2O,O′)bis(ethanol-κO)cobalt(II)". Acta Crystallographica Section E Structure Reports Online 68, № 8 (2012): m1107—m1108. http://dx.doi.org/10.1107/s1600536812032837.

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The title compound, [Co(C17H13N2O2)2(C2H5OH)2], is a CoIIcomplex with two 4-benzoyl-3-methyl-1-phenyl-1H-pyrazol-5-olate (BMPP) ligands and two coordinating ethanol molecules. In the asymmetric unit, there are two half molecules, with the CoIIatoms located on inversion centres. The two cobalt complexes have slightly different geometries and in one, the ethyl group of the ethanol is disordered over two sets of sites [occupancy ratio 0.757 (7):0.243 (7)]. Each BMPP ligand is deprotonated with the negative charge delocalized. The hydroxy group of each ethanol molecule forms hydrogen bonds with a

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37

Park, Hyunjin, Jineun Kim, Hansu Im, and Tae Ho Kim. "A two-dimensional copper(I) coordination polymer based on 1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one." Acta Crystallographica Section E Crystallographic Communications 73, no. 11 (2017): 1782–85. http://dx.doi.org/10.1107/s2056989017015377.

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The reaction of copper(I) iodide with 1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one (L, C13H19NOS) in acetonitrile/dichloromethane results in a crystalline coordination polymer, namely poly[bis{μ2-1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one}tetra-μ3-iodidotetracopper(I)], [Cu4I4L2]n. The asymmetric unit comprises two ligand molecules, four copper(I) ions and four iodide ions. Interestingly, the O atoms are bound to the soft copper(I) ions. The stair-step clusters of Cu and I atoms in the asymmetric unit are linked repeatedly, giving rise to infinite chains along [100]. Neighbouring inf

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38

Holczbauer, Tamas, Attila Domjan та Csaba Fodor. "Crystal structure of diaquatris(1-ethyl-1H-imidazole-κN3)(sulfato-κO)nickel(II)". Acta Crystallographica Section E Crystallographic Communications 72, № 3 (2016): 374–77. http://dx.doi.org/10.1107/s2056989016002863.

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In the title complex, [Ni(SO4)(C5H8N2)3(H2O)2], the NiIIion is coordinated by three facial 1-ethyl-1H-imidazole ligands, one monodentate sulfate ligand and two water molecules in a slightly distorted octahedral coordination environment. In the crystal, two pairs of O—H...O hydrogen bonds link complex molecules, forming inversion dimers incorporatingR24(8),R22(8) andR22(12) rings. The dimeric unit also contains two symmetry-unique intramolecular O—H...O hydrogen bonds. In addition, weak C—H...O hydrogen bonds, weak C—H...π interactions and π–π interactions with a centroid–centroid distance of 3

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39

Abbas, Rana Abdulilah, Amer J.jarad, Ion Marius Nafliu, and Aurelia Cristina Nechifor. "Synthesis, Characterization and Antibacterial Activity from Mixed Ligand Complexes of 8-Hydroxyquinoline and Tributylphosphine for Some Metal Ions." Revista de Chimie 70, no. 1 (2019): 36–40. http://dx.doi.org/10.37358/rc.19.1.6846.

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Co+2, Ni+2, Cu+2 as well Zn+2 compounds mixed ligand from 8-hydroxyquinoline(8-HQ) also tributylphosphine (PBu3) have been attended at aquatic ethyl alcohol for (1:2:2) (M:8-HQ:PBu3). Produced complexes have been identified by utilizing atomic absorption flame, FT-IR as well UV-Vis spectrum manners also magnetic susceptibility as well as conductivity methods. At addendum antibacterial efficiency from the ligands as well complexes oboist three species about bacteria have been as well examined. Ligands and their complexes show good bacterial efficiencies. Of the gained datum the octahedral geome

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40

Fang, Chao, Yan Yin, Heng Zhang та Fan Hong Wu. "Enantioselective Reformatsky Reaction between Cinnamaldehyde and Diflurinated Organozinc Reagent: Synthesis of Chiral γ,γ-difluoro-β-hydroxy Esters as Precursors of Statin Analogues". Advanced Materials Research 881-883 (січень 2014): 154–58. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.154.

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Reaction conditions of asymmetric Reformatsky reaction between cinnamaldehyde 1 and ethyl bromodifluoroacetate 2 were investigated. Finally, (1S, 2R)-N,N-dimethyl-2-aminol-1, 2-diphenylethanol (ligand C) was proved to be the best ligand for this transformation and up to 37% ee was obtained with THF as solvent in -40 degree.

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Tarui, Atsushi, Takeshi Ikebata, Kazuyuki Sato, Masaaki Omote та Akira Ando. "Enantioselective synthesis of α,α-difluoro-β-lactams using amino alcohol ligands". Org. Biomol. Chem. 12, № 33 (2014): 6484–89. http://dx.doi.org/10.1039/c4ob01184h.

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Bogdanović, Borislav, Gudrun Koppetsch, Carl Krüger, and Richard Mynott. "Magnesiumorganische Innerkomplexe, Teil II [1]. Ethyl(dialkylaminoalkyl)- und Ethyl(4-alkoxybutyl)magnesium-Verbindungen / Organomagnesium Inner Complexes, Part II [1]. Ethyl(dialkylaminoalkyl)- and Ethyl(4-alkoxybutyl)magnesium Compounds." Zeitschrift für Naturforschung B 41, no. 5 (1986): 617–28. http://dx.doi.org/10.1515/znb-1986-0514.

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Abstract The reaction of bis(dialkylaminoalkyl)-and bis(4-alkoxybutyl)magnesium inner complexes with MgEt2 leads to the formation of ethyl(dialkylaminoalkyl)-and ethyl(4-alkoxybutyl)magnesium compounds. The X-ray crystal structures of ethyl(3-N,N-dimethylam inopropyl)magnesium and ethyl(3-N-cyclohexyl-3-N-methylaminopropyl)magnesium confirm that the com pounds are dimeric with the α-C-atom of the chelating ligand bridging the magnesium atoms.The difference in reactivity of the Mg-Et and Mg-CnH2nX bonds (X = NR′R″, OR) makes itself apparent in the reaction of these complexes with ethylene: up t

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43

Hussein, Modather F. "New sulfonamide hybrids: synthesis, in vitro antimicrobial activity and docking study of some novel sulfonamide derivatives bearing carbamate/acyl-thiourea scaffolds." Mediterranean Journal of Chemistry 7, no. 5 (2018): 370–85. http://dx.doi.org/10.13171/mjc751912111445mh.

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In this study, the novel hybrids sulfonamide carbamates were synthesized by treatment of N-substituted 4-isothiocyanatophenyl sulfonamides with ethyl carbamate in dry 1,4-dioxane at reflux temperature in the presence of triethylamine. Also, treatment of Phenylacetylisothiocyanate with sulfanilamide in refluxing acetonitrile afforded the corresponding hybrid sulfonamide acylthiourea derivatives. The anti-microbial activities of the synthesized compounds were evaluated. Ethyl ({4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl)-phenyl]carbamothioyl)- carbamate and 2-Phenyl-N-((4-(N-thiazol-2-yl)sulfamoyl)-

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44

Yang, Yuzhu, Ting Wu, and Youlai Fang. "Palladium-Catalyzed Regioselective Coupling of Secondary Propargyl Carbonates and Ethyl 2-(pyridin-2-yl)acetate Derivatives: Facile Access to C-3 Benzylated Indolizines." Synlett 29, no. 14 (2018): 1909–13. http://dx.doi.org/10.1055/s-0037-1609552.

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A palladium-catalyzed ligand controlled regioselective coupling reaction of secondary propargyl carbonates and ethyl 2-(pyridin-2-yl)acetate derivatives has been described, leading to C-3 benzylated indolizines for the first time in moderate to good yields. DBFphos as the ligand is crucial to this high regioselective annulation reaction, and a plausible reaction mechanism has been proposed.

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45

Tarui, Atsushi, Haruka Nishimura, Takeshi Ikebata, et al. "Ligand-Promoted Asymmetric Imino-Reformatsky Reaction of Ethyl Dibromofluoroacetate." Organic Letters 16, no. 8 (2014): 2080–83. http://dx.doi.org/10.1021/ol500631j.

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46

McFarland, Coleen A., Sherry A. Gross, Jeffrey S. Winfield, and Virginia B. Pett. "An ethyl-cobalt complex with a buckled equatorial ligand." Inorganica Chimica Acta 221, no. 1-2 (1994): 35–40. http://dx.doi.org/10.1016/0020-1693(94)03967-4.

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47

TOUKONIITTY, E., and D. MURZIN. "Origin of ligand acceleration in heterogeneous ethyl pyruvate hydrogenation." Journal of Catalysis 241, no. 1 (2006): 96–102. http://dx.doi.org/10.1016/j.jcat.2006.04.017.

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48

Hasanov, Kh I., A. N. Azizova, N. M. Kulieva, G. I. Adjalova, M. Yu Yusifova, and Sh G. Kasumov. "MEMBRANE-PROTECTIVE PROPERTIES OF PALLADIUM (II) COMPLEXES CONTAINING ANTIOXIDANT FRAGMENT AS POTENTIAL RADIOPROTECTIVE AGENTS." Chemical Problems 23, no. 2 (2025): 214–20. https://doi.org/10.32737/2221-8688-2025-2-214-220.

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New complex compounds of palladium (II) with the biologically active ligand 2-ethyl-6 methyl-3hydroxypyridine – mexidol were synthesized in acidic (pH=5.3) and slightly alkaline (pH=7.5) media, respectively, of the following composition: (C8H12ON+)2[PdCl4] – (HL)2[PdCl4] (I) and [Pd(C8H11NO)2Cl2] – [PdL2Cl2] (II). In complex I, two ligand molecules are protonated and occupy the outer coordination sphere as singly charged cations. In complex II, the ligands are coordinated monodentately via the nitrogen atom in the trans-position to each other. Complexes I and II were tested for radioprotective

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49

Dahcheh, Fatme, and Douglas W. Stephan. "Reactions of ruthenium hydrides with ethyl-vinyl sulfide." Dalton Trans. 43, no. 9 (2014): 3501–7. http://dx.doi.org/10.1039/c3dt53326c.

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Ru-hydride precursors containing the OCO-carbene ligand react with ethyl-vinyl-sulfide to give Ru alkyl and vinyl derivatives via an initial insertion of the vinyl-fragment into the Ru–H, subsequent C–H activation and loss of diethyl sulfide.

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50

Panchbhai, Mayura A., L. J. Paliwal, and N. S. Bhave. "Synthesis and Characterization of Complex Compounds of Tetra-aza Macrocyclic Ligand." E-Journal of Chemistry 5, s1 (2008): 1048–54. http://dx.doi.org/10.1155/2008/457098.

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This paper deals with the synthesis and characterization of a macrocyclic ligand (L) and its new-fangled complex compounds of the general formula [M-L Cl2] for M= Ru(III), and [M-L] for Pt(II) and Pd(II) where L is a macrocyclic ligand resulted from the condensation reaction of ethylene diamine and ethyl acetoacetate. The ligand and its coordination compounds are formulated according to the chemical analysis, electronic, infrared,1HNMR and mass spectra, as well as magnetic susceptibility values.

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