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2.
Douglas X. West David L. Huffman Jill S. Saleda Anthony E. Liberta 《Transition Metal Chemistry》1991,16(6):565-570
Summary Two series of copper(II) complexes. [Cu(HL)X2] and [Cu(L)Cl], where HL is a 2-formylpyridine4
N-substituted thiosemicarbazone, L is an anion formed by loss of the2N hydrogen and X=Cl or Br, have been prepared and spectrally characterised. Their growth inhibition ofAspergillus niger andPaecilomyces variotii has been measured and compared with analogous complexes formed from 2-acetylpyridine thiosemicarbazones. 相似文献
3.
Cobalt(II), nickel(II) and copper(II) complexes of di-2-pyridyl ketone 3-piperidyl- and 3-hexamethyleneiminyl-thiosemicarbazones (HDPypip and HDPyhexim, respectively) have been prepared and characterized by physical and spectral methods. Use of 1:2 thiosemicarbazone-to-metal chloride molar ratios in the preparation of the complexes has produced both mononuclear and polynuclear species for the three metal ions. Crystal structures of the HDPypip, HDPyhexim and [Ni(DPyhexim)Cl] have been determined and aid the assignments of the i.r., n.m.r., u.v.–vis. n.i.r. and e.s.r. spectra for the various complexes. 相似文献
4.
Douglas X. West Cinda S. Carlson Collin P. Galloway Anthony E. Liberta Christina R. Daniel 《Transition Metal Chemistry》1990,15(2):91-95
Summary Complexes of stoichiometry [CuLX] where X=Cl, Br and L=2-acetylpyridine4
N-diethyl- and4
N-dipropylthiosemicarbazone, HL4DE and HL4DP, respectively, have substantially more activity againstAspergillus niger andPaecilomyces variotii than the uncomplexed thiosemicarbazones. Spectral data (i.e., i.r., u.v.vis., and e.s.r) of the complexes are presented along with thermodynamic data for the thiosemicarbazones. 相似文献
5.
《Journal of Inorganic and Nuclear Chemistry》1980,42(5):711-715
Cu(II) complexes have been prepared with N,N-dimethyl-2-picolinamine N-oxide (DMA) employing the tetrafluoroborate, nitrate, chloride and bromide salts. Complexes having 1:2 and 1:1 metal ion to ligand ratios have been isolated. Characterization has been accomplished by IR, electronic and ESR spectral measurements of the solid state. Significant changes occurred when spectral measurements of acetonitrile solutions of the various solids were attempted indicating alteration of the Cu(II) bonding occurs. Thermal data on the solids are included. 相似文献
6.
Yu.E. Kirsh V.Ya. Kovner A.I. Kokorin K.I. Zamaraev V.Ya. Chernyak V.A. Kabanov 《European Polymer Journal》1974,10(8):671-678
Water-soluble Cu(II) complexes of poly-4-vinylpyridine, partially quaternized by methyl bromide or dimethylsulphate (PP, Mt) and of the analogue (4-ethylpyridine) were studied by physicochemical technique such as visible spectrophotometry, viscosity, speed sedimentation and EPR spectroscopy. Peculiarities of the complex formation reaction were observed for the polymer compared to the analogue. The predominant formation of tetrapyridinate-Cu(II) species [(CuL4)]24 was found to take place in aqueous solution for PP, Mt with degree of quaternization (β) 20,24,37,49,57,65 per cent over a wide range of PYJ Cu(II) molar ratios. In addition, not all the free polymer pyridine residues are capable of forming [Cu L4 ]2 complexes even though there is a large excess of Cu(II) ions. The maximum value of the pyridine fraction forming [Cu L4 ]21 in PPYMt-20, 24, 37, 49 (obtained by spectroscopic titration) was found to be 45–50 per cent. Addition of Cu(NO3)2 to the aqueous polymer solution causes strong reduction of specific viscosity and increase of sedimentation coefficient from - 1 S to - 6 S. These data lend to the suggestion of the existence of macromolecular associates bound by Cu(II) ions and approximate estimation of their average molecular weight. It was shown also that Bjerrum's procedure cannot be used to account for the polymer stability constants. The differences between complex formation for polymer pyridine and monomer pyridine seem to be due to the high local pyridine concentration in the coil of the macromolecule and the hydration effects of the polymer chain on the characteristics of the pyridine residues. 相似文献
7.
Douglas X. West Cinda S. Carlson Anthony E. Liberta Julyan N. Albert Christina R. Daniel 《Transition Metal Chemistry》1990,15(5):341-344
Summary Nickel(II) complexes of 2-acetylpyridine4
N-diethyl- and4
N-dipropylthiosemicarbazone show less activity againstAspercallus niger than the free thiosemicarbazones. However, againstPaecilomyces variotii the nickel(II) complexes possess comparable activity at high concentrations and are more active at lower concentrations. Spectral and thermal information about the nickel(II) complexes, which coordinate the anionic thiosemicarbazone ligands in a tridentate manner, is included. 相似文献
8.
Summary
4
N-diethyl- and4
N-dipropylthiosemicarbazones of 2-acetylpyridine coordinate to FeIII, CoIII and CoII centres as tridentate NNS ligands. Spectral and physical data indicates that the size of the4
N-substituents can influence the stereochemistry and stoichiometry of the complexes, which show minimal ability to inhibit fungal growth and are considerably less active than the related copper(II) and nickel(II) complexes. 相似文献
9.
Madan Mohan Niranjan S. Gupta Munesh Kumar William E. Antholine Mohammed J. Ahmed Narendra K. Jha 《Transition Metal Chemistry》1994,19(3):265-269
Summary New copper(II) complexes with pyridoxal N4-methylthiosemicarbazone (H2Methsa), N4-ethylthiosemicarbazone (H2Etthsa) and N4-phenylthiosemicarbazone (H2Phthsa) have been prepared and characterized by analytical, magnetic, spectral, e.s.r. and electrochemical methods. All the compounds exhibit normal magnetic moments at room temperature. The variable temperature magnetic moments, however, show the presence of very weak intramolecular antiferromagnetic interaction (–2J = ca. 30cm-1) between the copper(II) centres in the complexes. The e.s.r. spectra at 77 K in DMSO indicate the presence of a mixture of monomers and dimers consistent with the dissociation of the complexes. Electrochemical studies in non-aqueous solvents show that the complexes undergo a quasi-reversible one electron facile reduction at markedly low negative potentials versus saturated calomel electrode (s.c.e.). 相似文献
10.
Douglas X. West Cinda S. Carlson Kevin J. Bouck Anthony E. Liberta 《Transition Metal Chemistry》1991,16(2):271-275
Summary Copper(II) complexes of the 3-pyrrolidinylthiosemicarbazones of 2-acetylpyridine and 2-acetylpyridineN-oxide have been prepared and their physical and spectral properties determined. Growth inhibition ofAspergillus niger, Paecilomyces variotii, Penicillium rubrum, andAspergillus terreus by thiosemicarbazones and their copper(II) complexes has been measured. These results are compared to 2-acetylpyridine 3-azacyclothiosemicarbazone ligand complexes. 相似文献
11.
Gao En-Qing Yang Guang-Ming Liao Dai-Zheng Jiang Zong-Hui Yan Shi-Ping Wang Geng-Lin Kou Hui-Zhong 《Transition Metal Chemistry》1999,24(2):244-246
Four new complexes of [14]N4 macrocyclic oxamides, namely [CuL1], [CuL2], [(CuL1)3Mn](ClO4)3 and [(CuL2)3 Mn](ClO4)3 [L1 and L2 are the dianions of 2,3-dioxo-5,6: 3,14-dibenzo-7,12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene (H2L1) and 2,3-dioxo-5,6:13,14-dibenzo-9-methyl-7,12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclo-tetradeca-7,11-diene (H2L2), respectively], have been prepared and characterized. The observed magnetic susceptibilities of the [(CuL1)3Mn] (ClO4)3 complex over the ca. 2–300 K range have been fitted to theoretical equations based on the Heisenberg spin Hamiltonian =–2JMn(Cu1+ Cu2+Cu3) and molecular field approximation. The results indicated that both the intramolecular and intermolecular magnetic interactions are antiferromagnetic with JCuMn= –19.8cm–1 and zJ=–1.41cm–1. 相似文献
12.
The synthesis and characterization of CuX2L; (X = CH3CH2COO?, ClCH2CH2COO?, CH3CHClCOO? or CH3CCl2COO?; and L = 4-acetylpyridine N-oxide) is reported. The characterization of these compounds was based on electronic, infrared and EPR spectra, as well as magnetic measurements over the temperature range. Several correlations between the spectral and magnetic data as well as pKa values of the respective acids were found and discussed. On the basis of spectral and magnetic data the structures of the compounds are discussed. 相似文献
13.
Two new CuII complexes, [Cu(Hambi)2(ClO4)2] and [Cu(Hambi)2(dca)2] (Hambi = 2-aminomethylbenzimidazole) have been prepared and characterized by X-ray diffraction, electronic paramagnetic resonance (e.p.r.) and i.r. analyses. Both complexes exhibit an elongated octahedral coordination environment with two Hambi ligands situated at the equatorial positions in a trans fashion [Cu—N bond distances range from 1.940(9) to 2.031(9) Å]. In the second complex, a new coordination mode, in which dicyanamide coordinates to copper(II) as a monodentate ligand with the amide nitrogen atom, was observed. 相似文献
14.
Avinash S. Kumbhar Subhash B. Padhye Douglas X. West Anthony E. Liberta 《Transition Metal Chemistry》1992,17(3):247-249
The electrochemical behaviour of a series of copper(II) complexes of 2-acetylpyridine 3-azacyclothiosemicarbazones is reported.
The complexes undergo a quasireversible one electron reduction in the range −0.400 to −0.450 Vversus Ag/AgCl, attributable to the copper(II)/-copper(I) redox couple. The electrochemical, as well as spectral characteristics
of these complexes, can be correlated with their antifungal activity againstAspergillus niger, Paecilomyces variotti, Penicillum rubrum andAspergillus terreus. 相似文献
15.
S. A. Nikolaevskii A. S. Burlov A. S. Bogomyakov V. G. Vlasenko D. A. Garnovskiy A. G. Starikov Ya. V. Zubavichus I. S. Vasilchenko S. I. Levchenkov A. I. Uraev 《Russian Journal of General Chemistry》2012,82(11):1770-1776
The binuclear chelates of copper(II) based on the tridentate azomethine ligands were synthesized and characterized by elemental analysis, IR, 1H NMR spectroscopy, X-ray absorption spectroscopy (XANES and EXAFS), and magnetic measurements. The quantum-chemical study of the structure and calculation of magnetic properties of the obtained metal-chelates was performed using the density functional theory with the broken symmetry technique. The performed magnetochemical studies in the temperature range 2?C300 K suggest the existence of antiferromagnetic exchange interaction in all obtained complexes. The parameters of the exchange interaction ?2J > 260 cm?1 were determined experimentally for all compounds, the experimental data is in a good agreement with the results of quantum-chemical calculations. 相似文献
16.
Zhi-hong Xu Pin-xian Xi Feng-juan Chen Xiao-hui Liu Zheng-zhi Zeng 《Transition Metal Chemistry》2008,33(2):267-273
Salicylaldehyde 2-phenylquinoline-4-carboylhydrazone (H2L), and its novel copper(II), cobalt(II), and nickel(II) complexes MHL · Cl · nH2O [M=Cu n = 3 (1), M=Co n = 2 (2), M=Ni n = 3.5 (3)] have been synthesized and characterized by elemental analysis, molar conductivity, spectroscopic, and thermal analysis.
The interaction of these complexes with calf thymus DNA was investigated by UV absorption spectroscopy, fluorescence spectroscopy,
cyclic voltammetry, and viscosity measurements. The results suggest that these complexes bind to DNA via an intercalation
binding mode and their affinity to DNA follows the order of 3 > 1> 2.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
17.
Ki-Young Choi Seung-Man Yang Kyu-Chul Lee Haiil Ryu Chan Hee Lee Jungho Seo Mancheol Suh 《Transition Metal Chemistry》2008,33(1):99-105
The tridentate ligand 2-Oximino-3-thiosemicarbazone-2,3-butanedione (Hotsb) reacts with MCl2 (M = Ni2+ or Cu2+) to give rise to the mononuclear complexes [Ni(Hotsb)2]Cl2 · H2O (1) and [Cu(Hotsb)Cl2] · H2O (2). These complexes have been characterized by X-ray crystallography, spectroscopy, and cyclic voltammetry. The nickel(II) ion
in (1) is in a six-coordinate octahedral environment being bonded to the two protonated tridentate ligands which occupy mer positions. The copper(II) ion in (2) is in a five-coordinate square-pyramidal geometry, in which the basal plane is made up the two nitrogens, sulfur, and chloride
atom, while the other chloride atom is coordinated at the axial position. The cyclic voltammogram of the complexes displays
two one-electron waves corresponding to MII/MIII and MII/MI processes. The electronic as well as infrared spectral properties of the title complexes are reported and discussed. 相似文献
18.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1990,46(11):1561-1568
The d-d absorption spectra of CuL2, where L = glycinehydroxamic acid (Glyha), l-α-alaninehydroxamic acid (Alaha), l-α-leucinehydroxamic acid (Leuha), l-histidinehydroxamic acid (Hisha) and sarcosinehydroxamic acid (Sarha), in aqueous solutions have been treated by the Angular Overlap Model (AOM) in C2h symmetry. Low symmetry splittings of absorption bands of the measured spectra were found by Gaussian analysis. The ligand field parameters were estimated by the Powell optimize algorithm. 相似文献
19.
Ohorodnik Yulia M. Alexander Sikalov A. Khomenko Dmytro M. Doroshchuk Roman O. Raspertova Ilona V. Shova Sergiu Babak Maria V. Lampeka Rostyslav D. 《Transition Metal Chemistry》2022,47(6):213-221
Transition Metal Chemistry - The structures of new p-cymene Ru(II) complexes with 2-(1-methyl-1H-1,2,4-triazol-3-yl)pyridine and 2-(1-methyl-1H-1,2,4-triazol-5-yl)pyridine were established based on... 相似文献
20.
Jean-Pierre Costes 《Transition Metal Chemistry》1985,10(5):185-187
Summary The condensation of acetylacetone with ethylenediamine yields 7-amino-4-methyl-5-aza-3-heptene-2-one (AEH). This terdentate (N2O) Schiff base forms various types of ternary complexes, depending on the nature of the second ligand. Examples of five- and six-coordination have been previously reported. The present paper points to the possibility of preparing a less common type of complex,i.e. [MII(AE)Py]+ (M=Ni or Cu) in which the use of a monodentate ligand (pyridine) favours a square planar geometry. 相似文献