142-71-2Relevant articles and documents
TGA and DTA studies on en and tmn complexes of Cu(II) chloride, nitrate, sulphate, acetate and oxalate
Prabhumirashi,Khoje
, p. 109 - 118 (2002)
Dynamic thermogravimetric and differential thermal analysis (TGA and DTA) of ethylenediamine (en) and tetramethylethylenediamine (tmn) complexes of a number of Cu(II) salts (chloride, nitrate, sulphate, acetate and oxalate) have been carried out. The thermal decomposition of these complexes occurs in steps involving dehydration, deamination and deanionation processes. However, majority of the weight loss steps in TGA are found to be composite in nature involving simultaneous loss of the component moieties in varying proportions. The ΔH and Ea values for various steps are deduced and the observed trends are analysed in terms of the nature of the processes underlying the steps and the differences in the nature of co-ordination of the ligands and/or the stereochemistry exhibited by the counter anions about the Cu(II) ion in the complex.
Structural studies and anticancer activity of a novel (N6O 4) macrocyclic ligand and its Cu(II) complexes
El-Boraey, Hanaa A.,Emam, Sanaa M.,Tolan, Dina A.,El-Nahas, Ahmed M.
, p. 360 - 370 (2011)
A novel (N6O4) macrocyclic ligand (L) and its Cu(II) complexes have been prepared and characterized by elemental analysis, spectral, thermal (TG/DTG), magnetic, and conductivity measurements. Quantum chemical calculations have also been carried out at B3LYP/6-31+G(d,p) to study the structure of the ligand and one of its complexes. The results show a novel macrocyclic ligand with potential amide oxygen atom, amide and amine nitrogen atoms available for coordination. Distorted square pyramidal ([Cu(L)Cl]Cl·2.5H2O (1), [Cu(L)NO3]NO 3·3.5H2O (2), and [Cu(L)Br]Br·3H 2O (4) and octahedral ([Cu(L)(OAc)2]·5H 2O (3)) geometries were proposed. The EPR data of 1, 2, and 4 indicate d1 x2 -y2 ground state of Cu(II) ion with a considerable exchange interaction. The measured cytotoxicity for L and its complexes (1, 2) against three tumor cell lines showed that coordination improves the antitumor activity of the ligand; IC50 for breast cancer cells are ≈8.5, 3, and 4 μg/mL for L and complexes (1) and (2), respectively.
A combined experimental and computational investigation on Tetrakis-μ-acetato-bis(acetamido)dicopper(II) and its application as a single source precursor for copper oxide
Trivedi, Manoj,Nagarajan,Kumar, Abhinav,Molloy, Kieran C.,Kociok-K?hn, Gabriele,Sudlow, Anna L.
, p. 920 - 924 (2011)
The physico-chemical properties of the Tetrakis-μ-acetato-bis(acetamido) dicopper(II) [Cu(O2CCH3)2(CH 3CONH2)]2 (1), have been thoroughly investigated via an integrated multi-technique experimental-computational approach. In the newly found orthorhombic compound, as revealed by low temperature single-crystal X-ray studies, the complex is present as centrosymmetrical dimeric unit, has a paddle-wheel conformation with four acetate ligands bridging two symmetry-related CuII ions. The distorted octahedral coordination environment around the CuII ion is completed by an oxygen atom from an acetamide ligand. The compound sublimates, without premature side decompositions, at 180 °C. The structural, electronic and thermal behavior of the neutral complex (1) has been investigated. The present study suggests application of [Cu(O2CCH3) 2(CH3CONH2)]2 (1) as a precursor for copper-based materials by Chemical Vapor Deposition.
Dehydration of copper(II) acetate monohydrate
Ball, M. C.,Portwood, L.
, p. 347 - 356 (1994)
The thermal dehydration of copper(II) acetate hydrate has been studied between 353 and 406 K, over a range of humidities. The dehydration is controlled by nucleation-and-growth kinetics at low temperatures, with an activation energy of 154 kJ.mol-1, which changes to contracting-disc kinetics at higher temperatures with a lower activation energy of 76 kJ.mol-1. Frequency factors have also been derived; the value for the high temperature process is low (107S-1) and that for the low temperature step is high (1017 s-1). Optical microscopy has been used to clarify the bulk kinetics; there is evidence for a reactive layer at the surface of the decomposing solid.
Protolytic dissociation mechanisms and comparative acid stabilities of palladium(II), zinc(II), copper(II), and nickel(II) complexes of alkylated dipyrrins
Rumyantsev, Evgeniy V.,Marfin, Yuriy S.
, p. 699 - 704 (2014)
Complexes of Pd(II), Cu(II), Ni(II), and Zn(II) with alkylated dipyrrins (Hdpm) were synthesized and characterized by physicochemical and spectroscopic methods. Protolytic dissociation kinetics of these complexes in benzene in the presence of acetic and trichloroacetic acid was studied. A protonated dipyrrin is the reaction product of protolytic dissociation of the complexes in acid solutions. The observed and true dissociation rate constants, as well as activation reaction parameters, were calculated. Kinetic models of the processes are proposed, and the patterns of influence of the ligand nature on dissociation kinetics were determined. The Pd(II) complexes proved to be much more stable than other those of the other metals, according to the results of the kinetic studies. The lability of the complexes strongly depends on the length and position of the alkyl substituent of the ligand. The dissociation of the Ni(II) complex gives a heteroligand complex at low concentrations of acid, but the complex undergoes full protolytic dissociation at higher concentrations of acid. The dissociation of the complex of Cu(II) is an equilibrium process, involving formation of the protonated form of the ligand.
The kinetics of complex formation in the trithiadiazoletri[3,4-di(4-tert- butylphenyl)-pyrrole] macrocycle-copper(ii) acetate-dmfa-h2o system
Lomova,Mozhzhukhina,Danilova,Islyaikin
, p. 1694 - 1700 (2009)
The paper presents the results of a study of the kinetics of coordination of a macroheterocyclic compound with an increased coordination cavity of the (3 + 3) McH3 composition consisting of sequentially alternating 1,3,4-thiadiazole and 3,4-bis
Preparation and characterization of copper(II) oxide thin films grown by a novel spray pyrolysis method
DeSisto, W.,Sosnowski, M.,Smith, F.,Deluca, J.,Kershaw, R.,et al.
, p. 753 - 760 (1989)
A novel spray pyrolysis reactor was used to prepare thin films of CuO on silica substrates. The resulting films were characterized by X-ray diffraction, electron microscopy, optical and electrical measurements. The films were single phase, homogeneous, and uniform. The films were p-type semiconductors with room temperature resistivity of 102 ohm-cm. The p-type nature of the films was determined to be due to the presence of Cu(III).
Cobalt, nickel, copper and cadmium coordination polymers containing the bis(1,2,4-triazolyl)methane ligand
Marchetti, Fabio,Masciocchi, Norberto,Albisetti, Alessandro Figini,Pettinari, Claudio,Pettinari, Riccardo
, p. 32 - 39 (2011)
Co(II), Ni(II), Cu(II) and Cd(II) coordination polymers containing the flexible ditopic bis(1,2,4-triazol-1-yl)methane ligand (Btm) have been prepared by reaction of equimolar quantities of the corresponding cobalt, nickel, copper and cadmium salts in EtOH solution. Structure solution and refinement of polycrystalline materials were performed by powder diffraction technique (XRPD), using conventional laboratory data. The results show that architecturally different coordination polymers were obtained depending on the counter-ion employed. The XRPD results show also that non-covalent interactions are driving forces for the occurrence of different structures.
Kinetic stability of complexes of some d-metals with 3,3'- bis(dipyrrolylmethene) in the binary proton-donor solvent acetic acid-benzene
Antina,Guseva,V'yugin,Antina
, (2012)
The kinetics of dissociation of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) binuclear homoleptic double-stranded helicates with bis(2,4,7,8,9- pentametyldipyrrolylmethen-3-yl)methane (H2L) of the [M 2L2] composition
On Verdigris, Part III: Crystal Structure, Magnetic and Spectral Properties of Anhydrous Copper(II) Acetate, a Paddle Wheel Chain
Bette, Sebastian,Costes, Alice,Kremer, Reinhard K.,Eggert, Gerhard,Tang, Chiu C.,Dinnebier, Robert E.
, p. 988 - 997 (2019)
Pure anhydrous Cu(CH3COO)2 was obtained both, by thermal dehydration of Cu(CH3COO)2·H2O and by drying a commercially purchased mixture of Cu(CH3COO)2·H2O and Cu(CH3COO)2 in a nitrogen atmosphere using P2O5 as drying agent. The crystal structure was solved ab initio from synchrotron X-ray powder diffraction (XRPD) data at 150 °C and from laboratory XRPD data at ambient conditions and found to be isotypic to anhydrous chromium(II), molybdenum(II) and rhodium(II) acetate. Cu(CH3COO)2 crystallizes in space group P1 (no. 2) with lattice parameters of a = 5.1486(3) ?, b = 7.5856(6) ?, c = 8.2832(6) ?, α = 77.984(4)°, β = 75.911(8)°, γ = 84.256(6)° at ambient conditions. Cu2(CH3COO)4 paddle wheels with short (2.6 ?) Cu–Cu distances form chains in a direction, which is the main motif in the crystal structure. Due to their identical structural main motif Cu(CH3COO)2·H2O and Cu(CH3COO)2 exhibit a similar bluish-green color, almost identical UV/Vis spectra and comparable magnetic properties. The temperature dependent magnetic susceptibility also indicates only weak inter-dimer spin exchange between neighbouring Cu2(CH3COO)4 paddle wheels.
