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Cao Y.,Yulin University | Cao Y.,Liaocheng University | Chen J.,Shaanxi Educational College | Di Y.,Liaocheng University | And 3 more authors.
Chinese Journal of Chemistry | Year: 2010

The tetrachlorocuprate(II) ethylenediammonium and tetrachlorocadmate(II) ethylenediammonium were synthesized. Chemical analysis, elemental analysis, and X-ray crystallography were applied to characterize the compositions and crystal structures of the two complexes. The lattice potential energies and the radiuses of the anions of two complexes were calculated to be UPOT[(C 2H10N2)CuCl4]=1810.19 kJ·mol-1, UPOT[(C2H10N 2)CdCl4]=1784.39 kJ·mol-1, r[(CuCl 4)2-]=0.308 nm, and r[(CdCl4) 2-]=0.321 nm from the data of the crystal structure, respectively. Low-temperature heat capacities of the two complexes were measured by a precision automatic adiabatic calorimeter with the small sample over the temperature range from 78 to 400 K, respectively. Two polynomial equations of heat capacities against the temperatures were fitted by least square method: Cp,m[(C2H10N2)CuCl 4, s] =213.553+118.578X-5.816X2+4.392X3+0. 276X4 and Cp,m[(C2H 10N2)CdCl4, s] =190.927+98.501X-7.931X 2+0.657X3+3.834X4, in which X= (T-239)/161. Based on the fitted polynomial equations, the smoothed heat capacities and thermodynamic functions of the two complexes relative to the standard reference temperature 298.15 K were calculated at intervals of 5 K. Low-temperature heat capacities of two complexes were studied by adiabatic calorimetry. The smoothed heat capacities and other fundamental thermodynamic properties were obtained. Copyright © 2010 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


He D.-H.,Liaocheng University | Chen J.-T.,Liaocheng University | Chen J.-T.,Shaanxi Educational College | Di Y.-Y.,Liaocheng University | And 3 more authors.
Journal of the Chemical Society of Pakistan | Year: 2011

A novel complex (C10H16NO)2CdCl 4·C10H16NOCl·H2O(s) was synthesized by the method of liquid phase reflux synthesis. FTIR, chemical and elemental analysis, and X-ray crystallography were applied to characterize the crystal structure and composition of the complex. The crystal structure of the complex belongs to triclinic system with space group P1 and cell parameters a=0.55703(6) nm, b=1.39937(15) nm, c=1.40559(16) nm; α =117.819(2)°, β =98.8510(10)°, γ =96.5770(10)°, respectively. The compound is a salt, which consists of three [C10H16NO]+ cations, a [CdCl4]2- anion, a Cl- anion and a water molecule. On account of electrostatic attraction and four types of intramolecular hydrogen bonds an infinite network supermolecule is formed. Low-temperature heat capacities of the compound were measured by a precise automated adiabatic calorimeter over the temperature range from78 to 365 K. A polynomial equation of heat capacities against the temperature in the region of (78-365) K was fitted by least square method. Based on the fitted polynomial equation, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated at intervals of 5 K. Source


Dan W.-Y.,Liaocheng University | Chen J.-T.,Shaanxi Educational College | Di Y.-Y.,Liaocheng University | Wang Q.,Liaocheng University | And 3 more authors.
Journal of Chemical Thermodynamics | Year: 2011

A novel complex, bis(trans-bis(N,N-dimethyl-(1-(R)-phenyl-2-(S)-methyl-2- aminoethoxy-N,O))-copper(II)) heptahydrate (abbreviated as Cu2(C 11H16NO)4·7H2O(cr)), was synthesized by the method of liquid phase reflux. The composition and structure of the complex were characterized by chemical analysis, elemental analysis, FTIR, and X-ray crystallography. A reasonable thermochemical cycle was designed based on the preparation reaction of the coordination compound, and standard molar enthalpies of dissolution of reactants and products were measured by an isoperibol solution-reaction calorimeter. Finally, the standard molar enthalpy of formation of the complex Cu2(C11H16NO) 4·7H2O(cr) was determined to be -(4525.22 ± 13.71) kJ · mol-1 in accordance with Hess's law. © 2010 Elsevier Ltd. All rights reserved. Source


Dan W.,Liaocheng University | Chen J.,Liaocheng University | Chen J.,Shaanxi Educational College | Di Y.,Liaocheng University | And 4 more authors.
Chinese Journal of Chemistry | Year: 2010

The complex (C11H18NO)2CuCl 4(s), which may be a potential effective drug, was synthesized. X-ray crystallography, elemental analysis, and chemical analysis were used to characterize the structure and composition of the complex. Lattice energy and ionic radius of the anion of the complex were derived from the crystal data of the title compound. In addition, a reasonable thermochemical cycle was designed, and standard molar enthalpies of dissolution for reactants and products of the synthesis reaction of the complex were measured by an isoperibol solution-reaction calorimeter. The enthalpy change of the reaction was calculated to be ΔrH  m=(2.69 ± 0.02) kJ•mol 1from the data of the above standard molar enthalpies of dissolution. Finally, the standard molar enthalpy of formation of the title compound was determined to be ΔfHm  [(C11H18NO)2CuCl4, s] =-(1822.96 ± 6.80) kJ•mol 1in accordance with Hess law. © 2010 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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