The combustion energy of thioproline was determined
by the precision rotating-bomb calorimeter at 298.15 K to be ΔcU= –2469.301.44 kJ mol–1.
From the results and other auxiliary quantities, the standard molar enthalpy
of combustion and the standard molar enthalpy of formation of thioproline
were calculated to be ΔcHmθC4H7NO2S,
(s), 298.15 K= –2469.921.44 kJ mol–1
and ΔfHmθC4H7NO2S, (s), 298.15K= –401.331.54
Authors:L. Xu, Y. De-Jun, L. Qiang-Guo, L. Ai-Tao, Y. Li-Juan, J. Qian-Hong, and L. Yi
The product from reaction of samarium chloride hexahydrate with salicylic acid and Thioproline, [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O, was synthesized and characterized by IR, elemental analysis, molar conductance, and thermogravimetric analysis. The standard
molar enthalpies of solution of [SmCl3·6H2O(s)], [2C7H6O3(s)], [C4H7NO2S(s)] and [Sm(C7H5O3)2·(C4H7NO2S)·H2O(s)] in a mixed solvent of absolute ethyl alcohol, dimethyl sulfoxide(DMSO) and 3 mol L−1 HCl were determined by calorimetry to be ΔsHmΦ[SmCl3 δ6H2O (s), 298.15 K]= −46.68±0.15 kJ mol−1 ΔsHmΦ[2C7H6O3 (s), 298.15 K]= 25.19±0.02 kJ mol−1, ΔsHmΦ[C4H7NO2S (s), 298.15 K]=16.20±0.17 kJ mol−1 and ΔsHmΦ[Sm(C7H5O3)2·(C4H6NO2S)]·2H2O (s), 298.15 K]= −81.24±0.67 kJ mol−1. The enthalpy change of the reaction
was determined to be ΔsHmΦ =123.45±0.71 kJ mol−1. From date in the literature, through Hess’ law, the standard molar enthalpy of formation of Sm(C7H5O3)2(C4H6NO2S)δ2H2O(s) was estimated to be ΔsHmΦ[Sm(C7H5O3)2·(C4H6NO2S)]·2H2O(s), 298.15 K]= −2912.03±3.10 kJ mol−1.
Seven mixed-ligand complexes of cobalt(II), nickel(II) and copper(II) containing benzoylacetone andL-proline (HL1), 2-pyrrolidone-5-carboxylic acid (HL2) orL-thioproline (HL3) were prepared and characterized by means of elemental analysis, IR, electronic spectra, magnetic moment measurements and
molar conductance. Both HL1 and HL2 coordinate with these metal ions in a neutral zwitterionic form (-NH2-CH-COO−), whereas HL3 coordinates as a monobasic chelating agent (O/N). The continuous thermochromism of the nickel(II) complex of HL1 (2) was attributed to a geometry change; it was investigated by DTA, TG, electronic spectra and X-ray powder diffraction