Preparation, structure, and thermochemical properties of a copper(II) Schiff-base complex

• Published in: Journal of thermal analysis and calorimetry Vol. 119; no. 2; pp. 1285 - 1292
• Main Authors: Li, Chuan-Hua, Jiang, Jian-Hong, Yang, Ping, Tao, Li-Ming, Li, Xu, Xiao, Sheng-Xiong, Peng, Xiu, Tao, Xu, Xie, Jin-Qi, Zhu, Yi, Xie, Ming-An, Li, Qiang-Guo
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2015; Springer
• Subjects: Analysis; Analytical Chemistry; Calorimetry; Chemistry; Chemistry and Materials Science; Copper compounds; Copper industry; Diffraction; Enthalpy; Inorganic Chemistry; Ligands; Mathematical analysis; Measurement Science and Instrumentation; Methyl alcohol; Physical Chemistry; Polymer Sciences; Thermochemical properties; Thermodynamics; X-rays; Thermochemical cycle; Copper(II) Schiff-base complex; Hess’s law; Standard molar enthalpy of formation; Dissolution-reaction calorimeter
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-014-4232-2

A copper(II) Schiff-base complex [CuL·2MeOH·H 2 O] was prepared by reaction of the ligand [H 2 L =  N , N′ - o -phenylene-bis(3-methoxysalicylideneimine)] and Cu(OAc) 2 ·H 2 O 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 N 2 O 2 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: Δ f H m θ [H 2 L(s), 298.15 K] = −(384.2 ± 9.10) kJ mol −1 and Δ f H m θ [CuL·2MeOH·H 2 O (s), 298.15 K] = −(1072.6 ± 9.2) kJ mol −1 .