Low-temperature molar heat capacities and thermodynamic properties of a new rare earth complex Er2(μ 2-Gly)6(H2O)4•Na2(ClO4)8(H2O)2•4H2O

A hydrous complex of erbium coordinated with glycine sodium perchloric acid, Er-2(mu (2)-Gly)(6)(H2O)(4)center dot Na-2(ClO4)(8)(H2O)(2)center dot 4H(2)O (Gly = glycine), was synthesized firstly and characterized by X-ray single-crystal diffraction. The complex crystallizes centrosymmetrically in the triclinic P-1 space group [a = 9.2959 (5), b = 12.1756 (7) , c = 13.9928 (7) , V = 1367.67 (13) (3), Z = 1]. The low-temperature molar heat capacities and thermodynamic properties of the complex were studied with adiabatic calorimetry. The thermodynamic functions, [H (T)-H (298.15)] and [S (T)-S (298.15)], were derived in the temperature range from 80 to 370 K with a temperature interval of 5 K. Thermal decomposition behavior of the complex in nitrogen atmosphere was studied by thermogravimetric analysis and differential scanning calorimetry.