Low-temperature Heat Capacities and Thermodynamic Properties of the Solid State Complexes(C2H10N2)MCl4(s)(M=Cu and Cd) |
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| Authors: | Yanping Cao Jingtao Chen Prof Dr Youying Di Donghua He Wenyan Dan Yupu Liu |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Yulin University, Yulin, Shaanxi 719000, China;2. College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China;3. Department of Chemistry, Shaanxi Educational College, Xi'an, Shaanxi 710061, China |
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| Abstract: | 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(C2H10N2)CuCl4]=1810.19 kJ·mol?1, UPOT(C2H10N2)CdCl4]=1784.39 kJ·mol?1, r(CuCl4)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)CuCl4, s] =213.553+118.578X?5.816X2+4.392X3+0.276X4 and Cp,m(C2H10N2)CdCl4, s] =190.927+98.501X?7.931X2+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. |
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| Keywords: | (C2H10N2)MCl4 (s) (M?Cu and Cd) lattice energy adiabatic calorimetry low‐temperature heat capacity thermodynamic function |
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