Thermodynamics of bis-dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety

摘要

Firstly in the present research, the heat capacity of bis-dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety (TEMPO-Im-Py)Co(3,6-DBSQ)(2) was measured over the range T = (6 and 347) K by the precise adiabatic vacuum calorimeter. In the temperature interval of T = (220 to 285) K, the phase transition in the crystalline state was observed, and its standard thermodynamic characteristics were determined. The standard thermodynamic functions (p degrees = 0.1 MPa) of (TEMPO-Im-Py)Co (3,6-DBSQ)(2)(cr), namely C-p,m(o), Delta H-T(0)m(o), Delta S-T(0)m(o) and Delta(T)(0)G(m)(o), were calculated using the obtained experimental data from T -> 0 to 350 K. The low-temperature (T < 50 K) heat capacity dependence was analysed on the basis of the Debye heat capacity theory of solids and its multifractal model, so the characteristic temperature and the fractal dimension were determined, and chain-layered structure topology of the studied complex was established. (C) 2019 Elsevier Ltd.