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1.
Debdulal Maity Shouvik Chattopadhyay Ashutosh Ghosh Michael G.B. Drew Gurucharan Mukhopadhyay 《Polyhedron》2009
Two octahedral complexes [Ni(HL1)2](ClO4)2 (1) and [Ni(HL2)2](ClO4)2 (2) and a square planar complex [Ni(HL3)]ClO4 (3) have been prepared, where [HL1 = 3-(2-amino-ethylimino)-butan-2-one oxime, HL2 = 3-(2-amino-propylimino)butan-2-one oxime] and H2L3 = 3-[2-(3-hydroxy-1-methyl-but-2-enylideneamino)-1-methyl-ethylimino]-butan-2-one oxime. All the complexes have been characterized by elemental analyses, spectral studies and room temperature magnetic moment measurements. The molecular structures of all three compounds were elucidated on the basis of X-ray crystallography; complexes 1 and 2 are seen to be the mer isomers. 相似文献
2.
Chandan Adhikary Rajesh Bera Buddhadeb Dutta Sreyashi Jana Gabriele Bocelli Andrea Cantoni Siddhartha Chaudhuri Subratanath Koner 《Polyhedron》2008
Three copper(II) Schiff-base complexes, [Cu(L1)(H2O)](ClO4) (1), [Cu(L2)] (2) and [Cu(L3)] (3) have been synthesized and characterized [where HL1 = 1-(N-ortho-hydroxy-acetophenimine)-2-methyl-pyridine], H2L2 = N,N′-(2-hydroxy-propane-1,3-diyl)-bis-salicylideneimine and H2L3 = N,N′-(2,2-dimethyl-propane-1,3-diyl)-bis-salicylideneimine]. The structure of complex 1 has been determined by single crystal X-ray diffraction analysis. In complex 1, the copper(II) ion is coordinated to one oxygen atom and two nitrogen atoms of the tridentate Schiff-base ligand, HL1. The fourth coordination site of the central metal ion is occupied by the oxygen atom from a water molecule. All the complexes exhibit high catalytic activity in the oxidation reactions of a variety of olefins with tert-butyl-hydroperoxide in acetonitrile. The catalytic efficacy of the copper(II) complexes towards olefin oxidation reactions has been studied in different solvent media. 相似文献
3.
Nickel(II) complexes of quinoline-2-carbaldehyde N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL1) and 2-benzoylpyridine N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL2) have been synthesized and physico-chemically characterized by means of partial elemental analyses, molar conductance measurements, magnetic measurements, electronic and infrared spectral studies. Three complexes were given the formulae [Ni(HL1)2]Cl2 (1), [Ni(HL2)L2]ClO4 · 7H2O (2) and [NiL2Cl] · 0.5H2O (3). The structure of compound 1 has been solved by single crystal X-ray crystallography and is found to be distorted octahedral. Compound 2, when crystallized in DMSO solution, got deprotonated to form a new compound [Ni(L2)2] (2a), with a distorted octahedral Ni(II) center. In compound 1, HL1 coordinates to the metal in the thione form, while in compounds 2a and 3, HL2 coordinates in its deprotonated thiolate form. 相似文献
4.
María C. Rodríguez-Argüelles Roberto Cao Ana M. García-Deibe Corrado Pelizzi Jesús Sanmartín-Matalobos Franca Zani 《Polyhedron》2009
Cobalt(II), nickel(II), copper(II) and zinc(II) complexes of 2-thiophenecarbonyl hydrazone of 3-isatin (H2L1) and 2-furoic hydrazones of 3-isatin (H2L2) and 3-(N-methyl)isatin (HL3), with general composition [M(L)2] · nX, where X is ethanol or/and water, were synthesised and characterised. The molecular structure of HL3 showed that it crystallised in the keto form, which is also the more abundant tautomer for the three hydrazone ligands in solution. The three ligands behave as κ2-O,N donors in the cobalt(II) and zinc(II) complexes. The X-ray crystal structure of pseudotetrahedral [Zn(HL1)2] · 1.75MeOH confirmed the O,N coordination mode of the two monodeprotonated ligands in their keto forms. Secondary interactions of zinc ions with the O atoms of each isatin keto residue provoke a substantial distortion towards a square pyramidal form. The interaction of the isatin keto residues is stronger in the three nickel(II) complexes where the three acylhydrazones can be considered as κ3-O,N,O donors. 相似文献
5.
N.V. Loginova T.V. Koval’chuk Y.V. FaletrovY.S. Halauko N.P. OsipovichG.I. Polozov R.A. ZheldakovaA.T. Gres A.S. HalaukoI.I. Azarko V.M. ShkumatovO.I. Shadyro 《Polyhedron》2011,30(15):2581-2591
The synthesis and physico-chemical characterization of Fe(II) and Mn(II) complexes of 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfanyl]acetic acid (HLI) and 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfinyl]acetic acid (HLII) were carried out. The investigation of the molecular and electronic structure of Cu(II), Ni(II), Zn(II), Fe(II) and Mn(II) complexes has been performed within the density functional theory (DFT) framework. The computed properties were compared to the experimental ones, and molecular structures of the compounds were proposed based on the array of spectral data and quantum chemical calculations. Antibacterial activity of the Fe(II) and Mn(II) complexes was evaluated in comparison with Cu(II), Co(II), Ni(II) and Zn(II) complexes and three standard antibiotics; it was found to follow the order: (1) Сu(LI)2 > Mn(LI)2 > HLI > Ni(LI)2 > Zn(LI)2 > Fe(LI)2 > Co(H2O)2LI; (2) Cu(LII)2 > Сo(LII)2 > Ni(LII)2 > Mn(H2O)2(LII)2 > Fe(LII)2 > HLII > Zn(LII)2; their reducing ability (determined electrochemically) followed the same order. Spectrophotometric investigation was carried out in order to estimate the rate of the reduction of bovine heart сytochrome c with the ligands and their metal(II) complexes. The complexes Сu(LI)2, Mn(LI)2 and Co(LII)2 with the high reducing ability were found to be characterized by the highest rates of Cyt с reduction. NADPH:cytochrome P450-reductase had no substantial effect on the rate of сytochrome c reduction with HLI and HLII ligands. 相似文献
6.
N.V. Loginova T.V. Koval’chuk N.P. Osipovich G.I. Polozov V.L. Sorokin A.A. Chernyavskaya O.I. Shadyro 《Polyhedron》2008
Co(II) complexes with 4,6-di(tert-butyl)-2-aminophenol (HLI) and 2-anilino-4,6-di(tert-butyl)phenol (HLII) have been synthesized and characterized by means of physico-chemical methods. The compounds HLI and HLII coordinate in their singly deprotonated forms and behave as bidentate O,N-coordinated ligands; their low-spin Co(II) complexes are characterized by CoN2O2 coordination modes and square planar geometry. Both the free ligands and their Co(II) and Cu(II) complexes (we have produced and characterized the latter before) exhibit a pronounced antifungal activity against Aspergillus niger, Fusarium spp., Mucor spp., Penicillium lividum, Botrytis cinerea, Alternaria alternata, Sclerotinia sclerotiorum, Monilia spp., which in a number of cases is comparable with that of Nystatin and Terbinafine or even higher. The reducing properties of the ligands and their metal(II) complexes, as well as their antifungal activities, were found to decrease in the order: Cu(LI)2 > Cu(LII)2 ? Co(LI)2 > Co(LII)2 > HLI > HLII. 相似文献
7.
Mononuclear nickel(II) complexes with two ONS donor thiosemicarbazone ligands {salicylaldehyde 3-hexamethyleneiminyl thiosemicarbazone [H2L1] and salicylaldehyde 3-tetramethyleneiminyl thiosemicarbazone [H2L2]} have been prepared and physico-chemically characterized. IR and electronic spectra of the complexes have been obtained. The thiosemicarbazones bind to the metal as dianionic ONS donor ligands in all the complexes except in [Ni(HL1)2] (1). In compound 1, the ligand is coordinated as a monoanionic (HL−) one. The magnetic susceptibility measurements indicate that all the complexes are mononuclear and are diamagnetic. The complexes were given the formulae [Ni(HL1)2] (1), [NiL1py] (2), [NiL1α-pic] (3), [NiL1γ-pic] · H2O (4), [NiL2py] (5) and [NiL2γ-pic] (6). The structures of compounds 2 and 3 have been solved by single crystal X-ray crystallography and were found to be distorted square planar in geometry with coordination of azomethine nitrogen, thiolato sulfur, phenolato oxygen and pyridyl nitrogen atoms. 相似文献
8.
Two new reduced Schiff base ligands, [HL1 = 4-{2-[(pyridin-2-ylmethyl)-amino]-ethylimino}-pentan-2-one and HL2 = 4-[2-(1-pyridin-2-yl-ethylamino)-ethylimino]-pentan-2-one] have been prepared by reduction of the corresponding tetradentate unsymmetrical Schiff bases derived from 1:1: 1 condensation of 1,2-ethanediamine, acetylacetone and pyridine-2-carboxaldehyde/2-acetyl pyridine. Four complexes, [Ni(L1)]ClO4 (1), [Cu(L1)]ClO4 (2), [Ni(L2)]ClO4 (3), and [Cu(L2)]ClO4 (4) with these two reduced Schiff base ligands have been synthesized and structurally characterized by X-ray crystallography. The mono-negative ligands L1 and L2 are chelated in all four complexes through the four donor atoms to form square planar nickel(II) and copper(II) complexes. Structures of 3 and 4 reveal that enantiomeric pairs are crystallized together with opposite chirality in the nitrogen and carbon atoms. The two CuII complexes (2 and 4) exhibit both irreversible reductive (CuII/CuI; Epc, −1.00 and −1.04 V) and oxidative (CuII/CuIII; Epa, +1.22 and +1.17 V, respectively) responses in cyclic voltammetry. The electrochemically generated CuI species for both the complexes are unstable and undergo disproportionation. 相似文献
9.
Four complexes: [Bu2(L1)SnOSn(L1)Bu2]2 (1), [Bu2(L2)SnOSn(L2)Bu2]2 (2), [Bu2(L3)SnOSn(L3)Bu2]2 (3), and [Bu2(L4)SnOSn(L4)Bu2]2 (4), (HL1 = 2-(4-methylbenzoyl)benzoic acid, HL2 = 2-(2,4-diethylbenzoyl)benzoic acid, HL3 = 2-(4-chlorobenzoyl)benzoic acid, HL4 = 2-(4-isopropylbenzoyl)benzoic acid) have been prepared and structurally characterized by means of elemental analysis and vibrational, 1H NMR and FT-IR spectroscopies. The crystal structures of all complexes have been determined by X-ray crystallography. Three distannoxane rings are present to the dimeric tetraorganodistannoxane of planar ladder arrangement. Each structure is centro-symmetric and features a central rhombus Sn2O2 unit with two additional tin atoms linked at the O atoms. Complex 1 exhibited good antibacterial and antitumor activities and have a potential to be used as drugs. 相似文献
10.
José S. Casas Eduardo E. Castellano Javier Ellena María S. García-Tasende Agustín Sánchez José Sordo Ángeles Touceda Saulo Vázquez Rodríguez 《Polyhedron》2007
The reaction of lead(II) acetate in methanol with thiosemicarbazones derived from β-keto esters and β-keto amides (HTSCs) afforded two lead(II) thiosemicarbazonates and numerous homoleptic ([PbL2]) and/or heteroleptic ([Pb(OAc)L]) complexes containing deprotonated pyrazolones L− formed by metal-induced cyclization of the starting HTSC ligands. All the complexes isolated were characterized by IR spectroscopy in the solid state and by 1H and 13C NMR spectroscopy in DMSO solution; in addition, crystals containing [Pb(L6)2] and [Pb(L7)2] were examined by X-ray crystallography. [Pb(L6)2] · 0.5H2O · 0.3MeOH (HL6 = 4-ethyl-2,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1-carbothiamide) showed three types of molecule with significant structural differences that appear to be determined by packing interactions. In all three molecules the Pb?Pb distances are very short [3.6096(8)–3.7562(8) Å], but density-functional-theoretic calculations at the B3LYP level do not support the existence of Pb–Pb bonds. In [Pb(L7)2] (HL7 = N-ethyl-2,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1-carbothiamide) all the molecules are of a single type, and they are linked in a three-dimensional network by weak intermolecular Pb?O bonds. 相似文献
11.
Six new Cu(II), Ni(II) and Co(II) macroacyclic Schiff base complexes [MII(H2L)](ClO4)2 (L = L1 and L2) (I–VI) were prepared by the reaction of two new N2O4 Schiff base ligands in equemolar ratios. The ligands H2L1 and H2L2 were synthesized by reaction of 2-[2-(2-formyl phenoxy)ethoxy]benzaldehyde (A1) and/or 2-[2-(3-formylphenoxy)propoxy]benzaldehyde (A2) and ethanol amine and characterized with IR and 1H, 13C NMR spectroscopy. All complexes were characterized by microanalysis, IR and mass spectrometry, whereas complex I was also characterized by single crystal X-ray (CIF file CCDC no. 1020055). The X-ray structure of complex I revealed that all nitrogen and oxygen atoms of ligand (N2O4) have coordinated to the metal ion. However, Cu2+ ion is in six coordination environment that can bedescribed as a distorted octahedral geometry. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(2):339-352
Four new nickel(II), zinc(II), and cobalt(II) complexes, [Zn(L1)2]?·?H2O (1), [Ni(L1)2]?·?H2O (2), [Ni(L2)2] (3), and [Co(L3)2]?·?H2O (4), derived from hydroxy-rich Schiff bases 2-{[1-(5-chloro-2-hydroxyphenyl)methylidene]amino}-2-methylpropane-1,3-diol (HL1), 2-{[1-(2-hydroxy-3-methoxyphenyl)methylidene]amino}-2-ethylpropane-1,3-diol (HL2), and 2-{[1-(5-bromo-2-hydroxyphenyl)methylidene]amino}-2-methylpropane-1,3-diol (HL3) have been synthesized and characterized by elemental analyses, infrared spectroscopy, and single-crystal X-ray determination. Each metal in the complexes is six-coordinate in a distorted octahedral coordination. The Schiff bases coordinate to the metal atoms through the imino N, phenolate O, and one hydroxyl O. In the crystal structures of HL1 and the complexes, molecules are linked through intermolecular O–H···O hydrogen bonds, forming 1-D chains. The urease inhibitory activities of the compounds were evaluated and molecular docking study of the compounds with the Helicobacter pylori urease was performed. 相似文献
13.
W. -K. Dong Sh. -Sh. Gong Y. -X. Sun J. -F. Tong J. Yao 《Journal of Structural Chemistry》2011,52(5):1018-1024
Two new linear CuII complexes [Cu(L1)2] (I) (HL1 = (E)-3,5-dichloro-2-hydroxy benzaldehyde O-methyl oxime) and [Cu(L2)2] (II) (HL2 = (E)-3,5-dichloro-2-hydroxy benzaldehyde O-ethyl oxime) are synthesized and characterized by elemental analysis, IR, UV-Vis, and X-ray diffraction methods. X-ray crystallographic
analyses indicate that complexes I and II have a similar structure consisting of one CuII ion and two L− units. In the complexes, the CuII ion lying on an inversion centre is four-coordinated in a trans-CuN2O2 square planar geometry by two phenolate O and two oxime N atoms from two symmetry-related N,O-bidentate oxime-type ligands.
However, the crystal structure of the two complexes is different: complex I forms an infinite three-dimensional supramolecular network structure through intermolecular hydrogen bonding and π...π interaction,
while complex II forms an infinite one-dimensional supramolecular structure through intermolecular hydrogen bonds. 相似文献
14.
《Journal of Coordination Chemistry》2012,65(18):3265-3272
Three new centrosymmetric dinuclear copper(II) complexes, [Cu2Cl2(L1)2] (1), [Cu2(μ 1,3-NCS)2(L2)2] (2), and [Cu2(μ 1,1-N3)2(L3)2] (3), where L1, L2, and L3 are the deprotonated forms of the Schiff bases 1-[(2-propylaminoethylimino)methyl]naphthalen-2-ol (HL1), 1-[(3-methylaminopropylimino)methyl]naphthalen-2-ol (HL2), and 2-[(2-isopropylaminoethylimino)methyl]phenol (HL3), respectively, have been prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray crystallography. Each Cu is coordinated by the three donors of the Schiff bases and by two bridging groups, forming a square-pyramidal geometry. 相似文献
15.
P. SathyadeviP. Krishnamoorthy M. AlagesanK. Thanigaimani P. Thomas MuthiahN. Dharmaraj 《Polyhedron》2012,31(1):294-306
Bivalent transition metal hydrazone complexes of the composition [Ni(L1)2] (1), [Co(L1)2] (2), [Ni(L2)2] (3) and [Co(L2)2] (4) have been synthesised from the reactions of [MCl2(PPh3)2] (where M = Ni or Co) with hydrazones derived from 2-acetyl pyridine and carboxylic acid hydrazides of benzhydrazide (HL1) or thiophene-2-carboxylic acid hydrazide (HL2), respectively. Structure of the ligands HL1 and HL2 and their corresponding complexes with Ni(II) and Co(II) ions were proposed based on the elemental analysis, infrared and 1H NMR spectral methods. Single crystal X-ray diffraction study of complex 1 revealed a distorted octahedral geometry around the metal ion provided by two units of the ligand. To explore the potential medicinal value of the new complexes, binding interaction of all the complexes with bovine serum albumin (BSA) was studied at normal physiological conditions using fluorescence and UV-Vis spectral techniques. The number of binding sites (n) and binding constant (Ka) were calculated according to the double logarithm regression equation. The results of synchronous fluorescence spectrum showed that binding of metal hydrazones with BSA induced conformational changes in BSA. The in vitro antioxidant and antimicrobial potentials of the new chelates were also carried out. 相似文献
16.
Summary Copper(II), nickel(II) and cobalt(II) perchlorate complexes of 5,5-dimethylcyclohexane-1,2,3-trione-2-(p-nitrophenyl-hydrazone) (HL1), 5,5-dimethyl-cyclohexane-1,2,3-trione-2-(p-chlorophenylhydrazone) (HL2), 5,5-dimethylcyclohexane-1,2,3-trione-2-(o-chlorophenylhydrazone) (HL4), 5,5-dimethylcyclohexane-1,2,3-trione-2-(o-methylphenyl-hydrazone) (HL5) and 5,5-dimethylcyclohexane-1,2,3-trione-2-(m-methylphenylhydrazone) (HL6) have been prepared, and characterized using analytical, spectral and magnetic measurements. The data reveal that the reaction of Cu(ClO4)2 (1 mol) in EtOH, with all ligands, produces complexes of the type CuL(ClO4)(H2O).nH2O. Nickel(II) and cobalt(II) perchlorates react only with HL1 and HL2 to produce the complexes ML(ClO4)(H2O)3 (where M = NiII, L = L– and L2, M = CoII, L = L1) and Co(HL2)2-(ClO4)2.2H2O. The spectral data show that the ligands behave as monobasic bidentate in their azo forms, except HL2 which reacts with cobalt(II) as a neutral bidentate ligand in its hydrazone form. 相似文献
17.
《Journal of Coordination Chemistry》2012,65(11):1913-1920
Two series of zinc(II) complexes of two Schiff bases (H2L1 and H2L2) formulated as [Zn(HL1/HL2)]ClO4 (1a and 1b) and [Zn(L1/L2)] (2a and 2b), where H2L1 = 1,8-bis(salicylideneamino)-3,6-dithiaoctane and H2L2 = 1,9-bis(salicylideneamino)-3,7-dithianonane, have been prepared and isolated in pure form by changing the chemical environment. Elemental, spectral, and other physicochemical results characterize the complexes. A single crystal X-ray diffraction study confirms the structure of [Zn(HL1)]ClO4 (1a). In 1a, zinc(II) has a distorted octahedral environment with a ZnO2N2S2 chromophore. 相似文献
18.
The coordination capability of two pendant-armed azamacrocyclic ligands with cyanoethyl L1and cyanomethyl L2 pendant groups towards cadmium nitrate and perchlorate salts was achieved. All metal complexes were characterized by elemental analysis, LSI-MS, IR, conductivity measurements and 1H NMR spectroscopy. The X-ray crystal structure of the complexes [CdL1](NO3)2, [CdL1](ClO4)2 · CH3CN, and [CdL2](ClO4)2 · H2O were also determined. All the complexes are mononuclear with the metal ion in a distorted octahedral environment. The pendant groups are not coordinated to the metal due the linear nature of the cyano groups; however, different interactions between nitrate ions, nitrile groups and pyridine rings from the macrocycle have been observed in the Cd(II) complexes with L1. 相似文献
19.
Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H2L1), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H2L2), bis(di-2-pyridyl ketone) carbohydrazone (H2L3) and bis(2-benzoylpyridine) carbohydrazone (H2L4). Three complexes were given a general formula of [Ni(HL)]4[PF6]4 · nH2O and one [Ni2(HL2)L2]2(PF6)2 · 7H2O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL1)]4[PF6]4 · 11H2O crystallized as [Ni(HL1)]4(PF6)4 · 0.5 CH3CH2OH · 2.8H2O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms. 相似文献
20.
Banfeng Ruan Yupeng Tian Hongping Zhou Jieying Wu Chenhao Zhu Hailiang Zhu 《Journal of organometallic chemistry》2009,694(18):2883-1672
Two silver(I) complexes [Ag2(dppm)2(L1)2(CH2Cl2)2] (1) and [Ag4(dppm)2(L2)2(NO3)2] (2) have been prepared by the reactions of [Ag2(dppm)2(NO3)2] with HL1 and HL2 [dppm = bis(diphenylphosphino)methane, HL1 = 2-(9H-carbazol-9-yl) acetic acid and HL2 = (E)-3-(4-(9H-carbazole-9-yl) phenyl) acrylic acid], respectively. Both complexes have been structurally characterized by X-ray crystallography, confirming that 1 is a binuclear complex whereas 2 is a tetranuclear one. Both complexes were assayed for antibacterial activity against two Gram-positive bacterial strains (Bacillus subtilis ATCC 6633 and Staphylococcus aureus ATCC 6538) and two Gram-negative bacterial strains (Pseudomonas aeruginosa ATCC 13525 and Escherichia coli ATCC 35218) by MTT method. Complex 2 exhibited powerful antibacterial activities against B. subtilis ATCC 6633 with MIC of 0.78 μg/mL, which was superior to the positive controls penicillin G. On the basis of the biological results, structure-activity relationships were discussed. 相似文献