共查询到20条相似文献,搜索用时 31 毫秒
1.
Thermal and structural characterization of copper(II) complexes with phenyl-2-pyridylketoxime (HPPK)
Szczęsny R. Szłyk E. Kozakiewicz A. Dobrzańska L. 《Journal of Thermal Analysis and Calorimetry》2017,128(3):1591-1599
Journal of Thermal Analysis and Calorimetry - Copper(II) complexes of different nuclearity with phenyl-2-pyridylketoxime (HPPK), such as mononuclear [Cu(HPPK)(PPK)X], whereby... 相似文献
2.
Robert Szczęsny Tadeusz M. Muzioł Duncan H. Gregory Edward Szłyk 《Chemical Papers》2015,69(4):569-579
Four copper(II) oxime complexes, [Cu(HPPK)(PPK)X] (HPPK = phenyl-2-pyridylketoxime and X = CI? (I), CF3COO? (II), C3F7COO? (III), and [Cu(PPK)2]2 (IV)), were synthesized and characterized by elemental analysis, infrared spectroscopy (IR), and single-crystal X-ray diffraction (XRD). XRD analysis revealed that I–III contain copper(II) coordinated by four nitrogen atoms from two oxime molecules in the basal plane and one monodentate anion X in the apical position of a distorted square pyramid. Complex IV is dimeric and it is formed by two Cu(PPK)2 units. Bridges between these units are formed by the two oxygen atoms of the deprotonated oxime groups. Thermal stability of I–IV was investigated by thermogravimetric analysis (TGA) in air and in nitrogen atmosphere, respectively. Evolved gaseous decomposition products were characterized by IR. I–IV decompose via multistep processes. Fluorocarbons and CO2 were observed to be the most abundant gaseous species evolved. Preliminary ammonolysis experiments were performed to examine the possibility of using II and IV as precursors for the synthesis of copper nitride. Moreover, solutions of IV were spin-coated onto silicon substrates. Surface structure and morphology of the resulting films were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) and layers with island-like distribution of material were observed. 相似文献
3.
M. Adediran Mesubi 《Transition Metal Chemistry》1984,9(5):181-184
Summary The synthesis and characterisation of the coordination compounds of some copper(II) salts with bis (1-pyrazolyl)propane, Me2Cpz2, are reported. Coloured stable solid complexes of the type Cu(Me2Cpz2) X2(X = Cl–, Br– or AcO–), Cu(Me2Cpz2)(ClO4)2 · H2O, [Cu(Me2Cpz2)SO4 · 2 H2O] · H2O and [Cu(Me2Cpz2)2X]X (X = NO
3
–
or ClO
4
–
) have been isolated and characterised by elemental analysis, electronic, i.r. and magnetic measurements. Probable structures of the complexes are discussed on the basis of their spectral data. 相似文献
4.
Dilip Kumar Saha Sommai Patitungkho Subhash Padhye Dileep N. Deobagkar Aarti Ozarkar Mohan M. Bhadbhade Rajesh G. Gonnade 《Transition Metal Chemistry》2005,30(3):334-340
The X-ray crystal structures of two ciprofloxacin compounds, viz. [Cu(cfH)2(Cl)2] · 2MeOH · 6H2O (2) and [Cu(cfH)(phen)Cl]BF4 · 4H2O (3) are reported. Complex (2) has a distorted octahedral geometry, whereas for the nitrogen adduct (3) a distorted square–pyramidal geometry is seen. Significant enhancement in the antimycobacterial activity of the copper conjugates correlates with their copper redox couples (Cu2+ /Cu+) probably due to its relevance to intracellular accumulations and subsequent role in generating oxidative stress. 相似文献
5.
Long La-Sheng Tong Ye-Xiang Yang Shi-Ping Chen Xiao-Ming Ji Liang-Nian 《Transition Metal Chemistry》1999,24(4):440-444
The syntheses of two polydentate ligands comprising imidazole donors, 1,3-bis[(4-methyl-5-imidazol-1-yl) ethylideneamino]propan-2-ol (BIPO), 1,3-bis[(4-methyl-5-imidazol-1-yl)ethylideneamino]propane (BIP), and their copper(II) complexes [Cu(BIPO)(ClO4)(H2O)] (NO3) · H2O (1) and [Cu(BIP)(ClO4)](ClO4) · 2H2O (2) are reported. Single-crystal structural analyses show that (1) adopts an elongated octahedral geometry with the axial positions occupied by a perchlorate oxygen atom and an aqua ligand, while (2) adopts a distorted square-pyramidal geometry with the axial positions occupied by a perchlorate oxygen atom. Electronic spectra in aqueous solution indicate that both (1) and (2) adopt square-pyramidal geometry. Cyclic voltammetry in aqueous solution gives reduction waves at –0.07 and –0.08 V versus s.c.e. for (1) and (2), respectively. The low reduction potential and general reversibility of the redox reaction of (1) and (2) indicate that BIPO and BIP are flexible enough to stabilize both CuII and CuI forms of the complexes. 相似文献
6.
Summary The reactions of some copper(II) salts with bis(1-pyrazolyl)methane, H2Cbpz, bis(3,5-dimethylpyrazolyl)methane, H2Cbdmpz, and tris(1-pyrazolyl)methane, HCtpz give the following solid complexes: CuLX2 · nH2O (L=H2Cbpz, H2Cbdmpz or HCtpz; X=Cl–, Br–, NO
3
–
, OAc–, or 1/2 SO
4
2–
and n=0, 1, 3 or 5) and CuL2X2 · nH2O (L=HCtpz, X= C–, Br–, NO
3
–
or ClO
4
–
and n=0 or 2). The complexes have been characterised by elemental analysis, visible and i.r. spectral measurements.The reactions of Cu(HCtpz)X2 · nH2O (X=Cl– or Br–) with acetylacetonate (acac–), dialkyldithiocarbamate (S2CNMe
2
–
, S2CNEt
2
–
) or poly(1-pyrazolyl)borate (H2Bbpz–, HBtpz–) in aqueous solutions lead to the displacement of HCtpz and the subsequent formation of neutral [Cu(acac)2], [Cu(S2CNR2)2], [Cu(H2Bbpz)2] and Cu(HBtpz)2 while the reaction with oxalate ion, C2O
4
2–
yields a stable neutral solid compound, [Cu(HCtpz)(C2O4)]. 相似文献
7.
Krishan K. Narang Ram A. Lal Ram K. Thapa Vijai K. Gautam 《Transition Metal Chemistry》1988,13(3):212-216
Summary Some copper(II) complexes of the type Cu(HL)X·nH2O (where H2L = benzoin thiosemicarbazone; X=NO3; Cl, Br, SCN, ClO4 or 1/2SO4; n=O–2) have been prepared and characterized. All complexes have tetragonally distorted octahedral stereochemistry except the sulphatocomplex which is square pyramidal. The i.r. spectra reveal that HL acts as a monobasic tridentate ligand coordinating through the azine group nitrogen atom, thiocarbonyl sulphur atom and hydroxylic oxygen atom while NO3, Cl, Br and ClO4 act as terminal monodentate ligands and SCN and SO4 act as bidentate bridging ligands. The polycrystalline e.s.r. spectra suggest tetragonal symmetry for the copper(II) ion, involving a dx
2–y2 ground state. 相似文献
8.
The synthesis, spectral properties and crystal structures of Cs2[W(bpy)(CN)6]·2H2O and (AsPh4)2[W(bpy)(CN)6]·3.5H2O are described. The anions of both salts show distorted antiprismatic geometry with very similar bond lengths and angles. The structure of the [W(bpy)(CN)6]2– anion is independent of the type of cation, in contrast to the octacyanotungstate(IV). 相似文献
9.
Shvets A. A. Borodkin S. A. Kogan V. A. Safaryan G. P. Safoklov B. B. Tkachev V. V. Filipenko O. S. 《Russian Journal of Coordination Chemistry》2003,29(1):28-32
The structure of the Cu[(2-O–)(5-NO2)C6H3N–CH=CH–+PPh3]2 complex with the CuN2O2 coordination core of distorted square-planar geometry was established by X-ray diffraction analysis. The molecules in the crystal structure of the Cu[(2-O–)(5-NO2)C6H3N–CH=CH–+PPh3]2 · 2CHCl3 solvate are bound via hydrogen bonds of two types, namely, C(sp
2)–H···O and C(sp
3)–H···O. 相似文献
10.
Wang Qing-Lun Xie Cheng-Zhi Liao Dai-Zheng Yan Shi-Ping Jiang Zong-Hui Cheng Peng 《Transition Metal Chemistry》2003,28(1):16-20
Two new copper(II) complexes, [Cu(tacn)(H2BTC)2]·2H2O (1) and [Cu(tacn)(H2BTC)(H2O)](H2BTC)·5H2O (2), where H2BTC– = the benzene-1,3,5-tricarboxylic acid anion and tacn =1,4,7-triazacyclononane, have been synthesized and their structures determined. Copper(II) ions of both (1) and (2) are five-coordinate with three nitrogen atoms of tacn and two oxygen atoms of either H2BTC– or H2O. Hydrogen bonds in these two complexes result in them being differently packed in the crystal cell. 相似文献
11.
Two copper(II) complexes of pyridine betaine (C5H5N+CH2COO–; pyBET) were prepared and characterized by X-ray crystallography. In [Cu(pyBET)(H2O2)2(SO4)]n (1), each Cu (II) atom is in a distorted square-pyramidal environment surrounded by a carboxylato oxygen atom [1.944(5) Å], two oxygen atoms [1.921 (5) basal, 2.268(5) apical Å] from different sulfato groups, and two aqua ligands [1.944(4) Å]. The primary coordination sphere is extended into a zigzag chain through sulfato bridging linkages, and hydrogen bonding involving the aqua ligands generates a three-dimensional network. [Cu(pyBET)(H2O)2Cl2]·H2O (2) features a discrete metal complex with its distorted square-pyramidal coordination sites occupied by a carboxylato oxygen atom [2.000(2) Å], two aqua ligands [1.968(3) Å], and two chloro ligands [2.266(1), 2.469(1) Å] of which one is apical. The lattice water molecules form hydrogen bonds with the aqua and chloro ligands to yield a layer structure. 相似文献
12.
Xiong Ya He Chun An Tai-Cheng Cha Chang-Hong Zhu Xi-Hai Jiang Shaoji 《Transition Metal Chemistry》2003,28(1):69-73
In the neutral title complex [Cu(C4N2H3)2(H2O)3] or [Cu(BBR)2(H2O)3] (BBR– = Barbiturate), the CuII ion, in the slightly distorted square-pyramidal geometry, is coordinated by two O atoms of the two monodentate barbiturates and three O atoms of three water ligands. The average bond length of Cu—O (BBR–) is 1.981(5) Å and the average bond length of Cu—O (H2O) at the basal sites is 1.94(5) Å, i.e. much shorter than that of Cu—O (H2O) [2.175(11) Å]. The crystal structure is characterized by an extensive network of hydrogen bonds in which each [Cu(BBR)2(H2O)3] entity links to six adjacent [Cu(BBR)2(H2O)3] by O(C=O) ··· H—O(H2O) bonds. Tautomerism in the coordination process for BBR– was found from the crystal structure and i.r. spectral analysis. The interaction of CuII and BBR– in aqueous solution was also investigated by electronic spectra and electrochemical method. It was observed that the copper ion could not only form the [Cu(BBR)2(H2O)3] complex in aqueous but also catalyze the decomposition of BBR– at pH 1.1. 相似文献
13.
Xu Hong-Bin Yan Li-Kai Su Zhong-Min Yue Shu-Mei Zhang Heng-Jun Shao Kui-Zhan Zhao Ya-Hui 《Transition Metal Chemistry》2004,29(5):471-476
The stoichiometric reaction of (MeCOO)2Cu, iminodiacetic acid (H2IDA) and 1,10-phenanthroline (phen) in H2O yields the novel complex [Cu(IDA)(phen)(H2O)]·4H2O (1). An X-ray structural determination shows that the dimer was formed by diverse hydrogen bonding and – interactions, and that each metal CuII center is six-coordinate, exhibiting an octahedral coordination. The complex was also characterized by t.g.a., FT–IR and u.v.–vis. spectroscopy and the electrochemical behavior of (1) was also studied. Its electronic spectra have been calculated by the CIS method. 相似文献
14.
Subratanath Koner Ashutosh Ghosh Nirmalendu Ray Chaudhuri 《Transition Metal Chemistry》1990,15(5):394-398
Summary [Ni(dien)2]X2·nH2O (dien=diethylenetriamine; n=0, X=NO3 or CF3SO3; n=0.5, X=ClO4 or BF4 and n=2, X=CF3SO3) complexes have been prepared and investigated thermally in the solid state. [Ni(dien)2](NO3)2 (1) and [Ni(dien)2](CF3SO3)2 (2) undergo endothermic irreversible phase transitions (209–247°C and 184–205°C; H=5.6 kJ mol–1 and 7.7 kJ mol–1 for (1) and (2), respectively). [Ni(dien)2](ClO4)2·0.5H2O (3) shows an endothermic irreversible phase transition after deaquation (201–216°C; H=7.7 kJ mol–1). [Ni(dien)2](BF4)2·0.5H2O also shows an endothermic irreversible phase transition after deaquation, accompanied by partial decomposition. All the complexes possess octahedral geometry with the ligands arranged meridionally. The phase transitions are explained in terms of conformational changes of the triamine chelate rings.Author to whom all correspondence should be directed. Supplementary data available: i.r. spectra (Table 4) and x-ray diffraction patterns (Table 5). 相似文献
15.
Subratanath Koner Ashutosh Ghosh Nirmalendu Ray Chaudhuri 《Transition Metal Chemistry》1988,13(4):291-296
Summary Complexes [NiL2]X2·nH2O (L=diethylenetriamine; n=O when X=CF3CO2 or CCl3CO2; n=1 when X=Cl or Br, and n=3 when X=0.5SO4 or 0.5SeO4) and NiLX2·nH2O (n=1 when X=Cl or Br; n=3 when X=0.5SO4 or 0.5SeO4) have been synthesised and investigated thermally in the solid state. NiLSO4 was synthesised pyrolytically in the solid state from [NiL2]SO4·[NiL2]X2 (X=Cl or Br) undergo exothermic irreversible phase transitions (242–282° C and 207–228° C; H=–11.3 kJ mol–1 and –1.9 kJ mol–1 for [NiL2]Cl2 and [NiL2]Br2, respectively). [NiL2]-phenomenon (158–185° C; H=2.0 kJ mol–1). NiLX2· nH2O (n=1 or 3) undergo simultaneous deaquation-isomerisation upon heating. All the complexes possess octahedral geometry. 相似文献
16.
Acidity function scale for H2SO4 solutions in phenol-acetone solvents with low water content at 25°C
I. S. Kislina M. I. Vinnik S. G. Sysoeva S. G. Svetlichnaya V. M. Zakoshanskii 《Russian Chemical Bulletin》1992,41(1):55-59
The indicator method was employed to measure the acidity function H
0
S
of H2SO4 solutions in solvents consisting of an equimolar mixture of phenol and acetone with 0.8% water (from 3.6·10–4 to 2.6·10–2 M H2SO4) and 2.5% water (from 4.3·10–4 to 0.32 M H2SO4) and of phenol and acetone in a molar ratio of 1:1.5 with 0.67% water (from 1.63·10–4 to 7.77·10–2 M H2SO4) and 2.09% water (from 4.49·10–4 to 0.35 M H2SO4) at 25°C. The indicators employed were 4- and 2-nitroaniline.Deceased.N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 117977 Moscow. Lenneftekhim Scientific-Commercial Association, St. Petersburg. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 1, pp. 72–78, January, 1992. 相似文献
17.
Krishan K. Sharma Sulekh Chandra Dulal K. Basu Krishan K. Thakur 《Transition Metal Chemistry》1984,9(10):401-403
Summary Copper(II) complexes of isobutyl methyl ketone semicarbazone have been prepared and characterised by magnetic moments, i.r., electronic and e.s.r. spectral studies. The complexes were found to have CuL2X2 and CuL2X2 · 2H2O compositions. The electronic and e.s.r. spectra suggest a five-coordinated trigonal bipyramidal geometry, for the CuL2X2 complexes, (X=Cl–, Br–, NO
3
–
, and 1/2 SO
4
2–
) and six-coordinate octahedral geometry has been suggested for CuL2X2 · 2H2O (X=Cl–, Br–, NO
3
–
, SO
4
2–
). 相似文献
18.
Polyakova I. N. Poznyak A. L. Egorova O. A. 《Russian Journal of Coordination Chemistry》2001,27(12):852-854
X-ray diffraction analysis of Co(HNta) · 4H2O (I) (H3Nta = N(CH2COOH)3) revealed that its crystals are isostructural to a Zn analog and built from [Co(HNta)(H2O)3] complex molecules and crystallization water. The octahedral coordination of the Co atom includes two O atoms and an N atom provided by the chelating tridentate HNta2–ligand (average Co–O (Nta) 2.055 Å and Co–N 2.205 Å) and three O atoms of water molecules on the shared face (average Co–O(w) 2.105 Å). 相似文献
19.
Gianantonio Battistuzzi Marco Borsari Daniela Dallari Raffaele Battistuzzi 《Transition Metal Chemistry》1995,20(2):212-219
Summary
Tris-, bis- and mono-ligand complexes of NiII with 1-phenyl-4, 6-dimethylpyrimidine-2-thione (L) having the general formulae NiL3X2·2H2O (X = ClO
inf4
p–
, BF
inf4
p–
), NiL2X2 (X = Cl–, Br–, SCN– or NO
inf3
p–
), NiL2X2·EtOAc (X = Br– or I–), NiL2X2·H2O·EtOH (X = I– or NO
inf3
p–
) and NiLCl2·3H2O, were synthesized and their structures deduced from i.r. and electronic spectra, and magnetic properties. The combined evidence is consistent with an octahedral coordination for the NiII ion in all the complexes, with the ligand acting as a bidentate N,S-chelating agent. Spectral evidence, conductivity data and electro-chemical results in DMF solution show that the complexes undergo solvolysis readily. Polarographic and c.v. data for the [NiL3](ClO4)2·2H2O complex and for the [Ni-(DMF)6](ClO4)2-L systems, at increasing ligand concentrations, have shown that in DMF solution the [Ni(DMF)6]2+ cation prevails and that the thiopyrimidine-containing species, [NiL(DMF)5]2+ (L = N-monodentate ligand)
, can be formed only in the presence of a large excess of free ligand.Author to whom all correspondence should be directed. 相似文献
20.
Zou Jianzhong Hu Xiaodong Duan Chenying Xu Zheng You Xiaozeng Mak Thomas C. W. 《Transition Metal Chemistry》1998,23(4):477-480
Reaction of either K3[Fe(CN)6] or K4[Fe(CN)6] with a macrocyclic CuII complex, [Cu(teta)](ClO4)2 (teta = 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacylotetradecane), in aqueous solution gave the same product as shown by spectroscopic and physicochemical characterisation. The crystal structure of the complex shows that it is a one-dimensional linear chain type heterobinuclear FeIII–CuII polymer. The unit is composed of a [Cu(teta)(H2O)2]2+ cationic complex, a FeIII–CuII alternate linear chain unit, a ClO
4
–
ion and four water molecules. The Cu atom is coordinated in a distorted octahedral arrangement by four nitrogen atoms from one teta ligand and two nitrogen atoms of the bridging cyanide groups. The Cu—N bond distances involving the cyanide bridges, 2.522(7) and 2.608(7)Å, respectively, indicate weak antiferromagnetic interactions between the FeIII and CuII atoms. 相似文献