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1.
New [ML(H2O)2] complexes (M = Co2+, Ni2+, or Cu2+; H2L = diphenylthiocarbazide) were synthesized and studied using IR and diffuse reflection electronic spectroscopy, magnetic chemistry, conductometry, and DTA. The metals were shown to coordinate L2–through nitrogen and sulfur atoms. The complex [CuL(H2O)2] is a dimer. 相似文献
2.
Some 1:1 and 1:2 adducts of cobalt(II), nickel(II) and copper(II) chloroacetates with quinoline N -oxide have been isolated by the interaction of the appropriate metal chloroacetate with quinoline N -oxide (QuinNo). The complexes isolated are of 1:1 stoichiometry of formula [M(CH3_xClxCOO)2QuinNO] (when M=Co(II), Ni(II); X=1,2 and 3 and when M=Cu(II), X=l and 2) except copper(II) trichloroacetate which yields an adduct of 1:2 stoichiometry of formula[Cu(CCI3COO)2(QuinNO)2]. The adducts isolated are soluble in common organic solvents. 相似文献
3.
Complexes of Cu(II), Ni(II) and Co(II) with the Schiff bases derived from o-aminobenzoic acid with salicylaldehyde and its 5-chloro and 5-bromo derivatives have been prepared. The 1:1 (metal-ligand) stoichiometry of these complexes is shown by elemental analysis, gravimetric estimations and conductometric titrations while the structures of the complexes are proved by i.r. spectra and thermogravimetric analysis. The magnetic susceptibility and electronic spectra of Cu(II) complexes indicate the nonplanar binuclear structures while that of Ni(II) and Co(II) show their paramagnetic octahedral geometry. The molar conductance values in nitrobenzene indicate the nonelectrolytic behaviour of the complexes. The results show that the complexes of the type (Cu·L)2, Ni·L·3H2O and Co·L·3H2O are formed having solvent molecule in coordination with the metal ion. The monopyridine and monoammonia adducts of Cu(II) complexes were found to be monomeric. 相似文献
4.
Some 1:1 and 1:2 adducts of cobalt(II), nickel(II) and copper(II) chloroacetates with quinoline N -oxide have been isolated by the interaction of the appropriate metal chloroacetate with quinoline N -oxide (QuinNo). The complexes isolated are of 1:1 stoichiometry of formula (M(CH3-xClxCOO)2QuinNO) (when M=Co(II), Ni(Il); X=l, 2 and 3 and when M=Cu(II), X=1 and 2) except copper(II) trichloroacetate which yields an adduct of 1:2 stoichiometry of formula[Cu(CCl3COO)2 (QuinNO)3]. The adducts isolated are soluble in common organic solvents. 相似文献
5.
S. S. Kandil F. I. Abdel-Hay R. M. Issa 《Journal of Thermal Analysis and Calorimetry》2001,63(1):173-180
The thermal decompositions of cobalt(II), nickel(II) and copper(II) complexes of4-(3'-sulfonylazido-6'-methoxyphenylazo)-1-phenyl-3-methyl-2-pyrazolin-5-one H(D1–SO2N3) and 4-(4'-sulfonylazido phenylazo)-3-phenyl-3-methyl-2-pyrazolin-5-one H(D2–SO2N3) were studied by thermogravimetry. The decomposition in all cases takes place along two stages. The first stage is due to the elimination of water and nitrogen molecules with the formation of tetracoordinate complexes containing nitrene reactive species[M(DSO2N:)2]. The second stage represents the decomposition of the material to the metal oxide. The kinetics of the decomposition were examined by using Coats–Redfern, the decomposition in all complexes was found to be first order for the first and second stages. The activation energies and other activation parameters (H* and S* and G*) were computed and related to the bonding and stereochemistry of the complexes.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
6.
F. A. Adam 《中国化学会会志》1987,34(2):111-115
Zn(II), Co(II) and Ni(II) complexes with some 5-substituted-1,3,4-thiadiazoles (L1-L4) have been prepared and characterized by conductivity, microanalysis, thermal analysis, infrared and electronic spectra measurements. All complexes behave as 1:1 electrolyte and the ligands are coordinated as bidentate molecules. The stability constants and energy of formation are determined and discussed on the basis of the ligands structure. 相似文献
7.
8.
Two Schiff base ligands, 2-{E-[(5-phenyl-6H-1,3,4-thiadiazin-2yl)imino]methyne}-1-naphthol (L1H) and 5-nitro-2-{[(5-phenyl-6H-1,3,4-thiadiazin-2-yl)imino]methyne}phenol (L2H) have been prepared from 5-phenyl-6H-1,3,4-thiadiazin-2-amine (A), 2-hydroxynaphthaldehyde (1) and 2-hydroxy-5-nitrobenzaldehyde (2) Mononuclear Co(II), NiII and CuII complexes of the ligands have been prepared by using CoII, NiII and CuII salts with a 1:2 metal:ligand ratio. It was determined that the bidentate behavior of the ligands is accomplished via the phenolic oxygen and the azomethine nitrogen atoms. The structures of the ligands and their complexes were identified
by using elemental analyses, i.r., 1H-n.m.r. spectra, electronic spectra, magnetic susceptibility measurements and thermogravimetric analyses (t.g.a.). 相似文献
9.
Shakirova O. G. Lavrenova L. G. Shvedenkov Yu. G. Berezovskii G. A. Naumov D. Yu. Sheludyakova L. A. Dolgushin G. V. Larionov S. V. 《Russian Journal of Coordination Chemistry》2004,30(7):473-479
New complexes of iron(II), cobalt(II), and nickel(II) with 4-(2-pyridyl)-1,2,4-triazole (PyTrz), [Fe3(PyTrz)8(H2O)4]A6 (A = NO3
-, ClO4
-, Br-) and [M3(PyTrz)8(H2O)4](NO3)6 (M = Co, Ni), were synthesized and studied by X-ray diffraction, magnetochemical method, and electronic and IR spectroscopy. The complex [Fe3(PyTrz)8(H2O)4](NO3)6) was also studied by adiabatic calorimetry. The Fe(II), Co(II), and Ni(II) nitrate complexes were shown to be isostructural to the previously synthesized linear trinuclear [Cu3(PyTrz)8H2O)4](NO3)6 complex. In all compounds, antiferromagnetic exchange interactions between M2+ ions were detected. The complex [Fe3(PyTrz)8(H2O)4](NO3)6 undergoes the 1
A
1 5
T
2 spin transition. 相似文献
10.
The new orotic acid complexes, [MCl2(H2O)3(H3Or)], M=Co(II), Ni(II) and [CuCl2(H2O)(H3Or)3] · H2O, were synthesized and characterized by elemental analysis, magnetic susceptibility, spectral (Diffuse reflectance UV–Vis
and FTIR) methods, and simultaneous thermal analysis (TG, DTG and DTA) techniques. Physical measurements indicate that the
neutral orotic acid ligands are bonded to metal ions through the carbonyl groups. Two thermal processes of the complexes can
occur: dehydration and pyrolytic decomposition. On the basis of the DTGmax, the thermal stability of the complexes follows the order: Co(II) (122 °C) > Cu(II) (77 °C) > Ni(II) (66 °C). 相似文献
11.
Mononuclear macrocyclic complexes of manganese(II ), cobalt(II ) and nickel(II ) perchlorate using 10 different oxaazamacrocyclic ligands (L1 — L10) have been prepared and characterized. The complexation reactions with the diiminic ligands were obtained by template condensation of the appropriate dialdehyde and diamine precursors; the reduced macrocycle complexes were synthesized using a direct route. The complexes have been characterized by elemental analyses, molar conductivity, mass spectrometry, IR, UV‐vis spectroscopy, diffuse reflectance and magnetic susceptibility measurements. 相似文献
12.
Mononuclear copper(Ⅱ), nickel(Ⅱ) and cobalt(Ⅲ) tetracoordinate macrocyclic complexes were synthesized and spectroscopically characterized. The crystal structure of the three compounds were determined by X-ray crystallography. The electrochemical experimental results indicate that the three complexes could interact with DNA mainly by electrostatic interaction. The interaction of tetracoordinate macrocyclic cobalt(Ⅲ) complex with DNA was studied by cyclic voltammetry and UV-vis spectroscopy. The experimental results reveal that tetracoordinate macrocyc- lic cobalt(Ⅲ) complex could interact with DNA by electrostatic interaction to form a 1 : 1 DNA association complex with a binding constant of 7.50 ×10^3 L·mol^-1. 相似文献
13.
Cobalt(II), nickel(II) and copper(II) complexation with acenaphthenequinone monosemicarbazone (AQSC) has been studied spectrophotometrically. The Co(II), Ni(II) and Cu(II) complexes are soluble in ethanol medium and exhibit maximum absorbance at 410, 420 and 430 nm, respectively. The sensitivity of the reactions are 0.012, 0.02 and 0.01 μg/cm2 for cobalt, nickel and copper systems. All the three complexes show maximum and constant absorbance in the pH range 8.4 to 9.8, 6.3 to 8.4 and 5.4 to 8.0 for Co-AQSC, Ni-AQSC and Cu-AQSC, respectively. Nickel and copper in some alloys have also been analysed. 相似文献
14.
《Analytical letters》2012,45(8):2021-2031
Abstract The preferential complexing tendency of different nietal ions towards chelating agents anchored on a polymer has been used for separation of transition metals. the anthranilic acid group was anchored on the polymeric cellulose back-bone by successive coupling with trifunctional reagent cyanuric chloride, in diozane medium, at pH 7 and 9–10, respectively. This polymer bound chelating agent was used to separate copper(II), nickel(II) and cobalt(II) in the concentration range 1.0–0.1 mmol/L. the separation of a mixture of two components was quantitative using column chromatography. 相似文献
15.
L. V. Voitenko I. D. Zhilyak V. A. Kopilevich 《Russian Journal of Applied Chemistry》2005,78(3):363-366
Synthesis of amorphous and crystalline double hydrated cobalt copper and nickel copper ammine diphosphates with a coordination structure is described.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 3, 2005, pp. 369–372.Original Russian Text Copyright © 2005 by Voitenko, Zhilyak, Kopilevich. 相似文献
16.
Gnanasoundari Vettaikaranpudur G. Natarajan Karuppannan 《Transition Metal Chemistry》2004,29(5):511-515
A series of new Schiff base complexes of FeIII, CoII, NiII and CuII containing Ph3P has been prepared and characterised. The Schiff bases have been prepared by the condensation of salicylaldehyde and naphthaldehyde with the appropriate aniline. The complexes have been characterised by analytical, spectral (i.r., electronic, magnetic, e.p.r., 1H-n.m.r.) and electrochemical studies. The new complexes have been used as catalysts for aromatic coupling reactions. Higher catalytic activity has been observed for NiII compared to the other complexes. 相似文献
17.
Two new vic-dioxime ligands, (E,E)-N-{4-[(1,4-dioxaspiro[4.4]non-2-ylmethyl)amino]butyl}-N-hydroxy-2-(hydroxyimino)ethanimidamide (L1H2) and (E,E)-N-{4-[(1,4-dioxaspiro[4.5]dec-2-ylmethyl)amino]butyl}-N-hydroxy-2-(hydroxyimino)ethanimidamide (L2H2) containing two different heteroatoms (N,O) have been prepared from anti-chloroglyoxime, N-(1,4-dioxaspiro[4.4]non-2-ylmethyl)butane-1,4-diamine (3) and N-(1,4-dioxaspiro[4.5]dec-2-ylmethyl)butane-1,4-diamine (4). CoII, NiII and CuII complexes of the ligands have a metal:ligand ratio of 1:2 and the ligands coordinate through the two N atoms, as do most of the vic-dioximes. However, ZnII complexes of the ligands have a metal:ligand ratio of 1:1 and the ligands are coordinated only by the N, O atoms of the vic-dioximes. In the CoII complexes two water molecules, and in the ZnII complexes a chloride ion and a water molecule, are also coordinated to the metal ion. The structures of the compounds were determined by a combination of elemental analysis, magnetic moments, molar conductances, thermogravimetric analysis (t.g.a.) and spectroscopic (u.v.–vis., i.r., 1H- and 13C-n.m.r.) data. 相似文献
18.
Jesús Martínez Rufina Bastida Alejandro Macías Laura Valencia Manuel Vicente 《无机化学与普通化学杂志》2005,631(11):2046-2053
The pendant‐armed ligands L1 and L2 were synthesized by N‐alkylation of the four secondary amine groups of the macrocyclic precursor L using o‐nitrobenzylbromide (L1) and p‐nitrobenzylbromide (L2). Nitrates and perchlorates of CuII, NiII and CoII were used to synthesize the metal complexes of both ligands and the complexes were characterized by microanalysis, MS‐FAB, conductivity measurements, IR and UV‐Vis spectroscopy and magnetic studies. The crystal structures of L1, [CuL1](ClO4)2·CH3CN·H2O, [CuL2](ClO4)2·6CH3CN, [CuL2][Cu(NO3)4]·5CH3CN·0.5CH3OH and [NiL2](ClO4)2·3CH3CN·H2O were determined by single crystal X‐ray crystallography. These structural analysis reveal the free ligand L1, three mononuclear endomacrocyclic complexes {[CuL1](ClO4)2·CH3CN·H2O, [CuL2](ClO4)2·6CH3CN and [NiL2](ClO4)2·3CH3CN·H2O} and one binuclear complex {[CuL2][Cu(NO3)4]·5CH3CN·0.5CH3OH} in which one of the metals is in the macrocyclic framework and the other metal is outside the ligand cavity and coordinated to four nitrate ions. 相似文献
19.
Six complexes, M(HL)2 · nH2O (M=Co, Ni and Fe; n=4) with two ligands, 2-carboxy-benzaldehydebenzoylhydrazone (H2L1) and 2-carboxybenzaldehyde-(4′-methoxy)benzoylhydrazone (H2L2), have been synthesized and characterized on the basis of elemental analyses, molar conductivities, i.r. spectra and thermal
analyses. In addition, the suppression ratio for O2- (a) and the suppression ratio for OH· (b) were determined with a 72 spectrophotometer. The 50% inhibition [IC50 (a) and IC50 (b)] of the complexes were studied. This study demonstrated that the complexes have activity in the suppression of O2- (a) and OH· (b). In general, the antioxidative activities increased as the concentration of these complexes increased up to a selected
extent. The complexes exhibit more effective antioxidants than the ligands and the series of the ligand (H2L2) are better than the series of the ligand (H2L1) do. 相似文献
20.
Shehab A. Sallam 《Transition Metal Chemistry》2006,31(1):46-55
Binuclear copper, nickel and cobalt complexes of the Schiff-bases obtained by condensation of glycylglycine with acetylacetone,
benzoylacetone, dibenzoylmethane and thenoyltrifluoroacetone were prepared by template synthesis. The complexes were characterized
by elemental analysis, conductivity measurements, magnetic moments, i.r., u.v.–vis. spectra, e.s.r., X-ray diffraction, t.g.a.,
d.t.a. and d.s.c. thermal analysis. All the complexes are non-electrolytes with low magnetic moments that indicate spin–spin
or antiferromagnetic exchange interactions. Spectral properties support square planar and square pyramidal or trigonal bipyramidal
structure provided by the N2O2 chromophores. E.s.r. spectra of the copper complex confirm the binuclear structure and the presence of magnetic interaction.
Thermal studies supported the chemical formulation of these complexes and showed that they decompose in three to four steps
depending on the type of ligand. Activation energies Ea and enthalpies ΔH, associated with the thermal decomposition of the complexes were calculated and correlated with the type of complexed metal.
A mechanism for thermal decomposition is proposed for the complexes. 相似文献