Abstract
A copper(II) Schiff-base complex [CuL·2MeOH·H2O] was prepared by reaction of the ligand [H2L = N, N′-o-phenylene-bis(3-methoxysalicylideneimine)] and Cu(OAc)2·H2O in methanol at 328.15 K. X-ray diffraction analysis revealed that the title complex was crystallized in the triclinic crystal system with space group P–1, in which copper(II) ion was located in the N2O2 ligand binding sites. According to two designed thermochemical cycles, the dissolution enthalpies of relevant substances of two reactions in the calorimetric solvents were determined by a solution-reaction isoperibol calorimeter, respectively. Combined with some other auxiliary thermodynamic data, the standard molar enthalpies of formation of the ligand and the complex were calculated to be: \( \Delta_{\text{f}} H_{\text{m}}^{\theta } \)[H2L(s), 298.15 K] = −(384.2 ± 9.10) kJ mol−1 and \( \Delta_{\text{f}} H_{\text{m}}^{\theta } \)[CuL·2MeOH·H2O (s), 298.15 K] = −(1072.6 ± 9.2) kJ mol−1.
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Acknowledgements
The authors thank the National Natural Science Foundation of China (No. 21273190), Science and Technology Plan Projects of Hunan Province, China (Nos. 2014FJ3011, 2013FJ3033), the Hunan Provincial Natural Science Foundation of China (No. 11JJ3019), the College Student Innovative Experimental Project of Xiangnan University (The Design for Drainage-oil Test Pen), the Hunan Provincial Colleges and Universities “twelve-five planning” Professional Comprehensive Reform Pilot Project (No. 2012-266), the Construction Project of Hunan Provincial Colleges and Universities Teaching Practice (No. 2013-295), the Scientific Research Foundation of Xiangnan University (Nos. 2013YJ36, 2013YJ37, 2013YJ38), and the Construct Program of the Key Discipline in Hunan Province for financial support.
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Li, CH., Jiang, JH., Yang, P. et al. Preparation, structure, and thermochemical properties of a copper(II) Schiff-base complex. J Therm Anal Calorim 119, 1285–1292 (2015). https://doi.org/10.1007/s10973-014-4232-2
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DOI: https://doi.org/10.1007/s10973-014-4232-2