Synthesis, Crystal Structure and Nonisothermal Kinetics of Complex Co(tda)(5-mphen)(H2O)

The title complex, formulated as Co(tda)(5-mphen)(H2O)(H(2)tda=thiodiglycolic acid, 5-mphen= 5-methyl-1,10-phenanthroline), was synthesized and characterized by elemental analysis, IR spectroscopy, X-ray single crystal diffraction, and TG-DTG techniques. The complex crystallized in monoclinic space group C2/c, with parameters of a=1.8142(2) nm, b=0.7825](9) nm, c=2.4624(3) nm, beta=93.809(2)degrees, V=3.4880(7) nm(3), Z 8, D,=1.579 g/cm(3), the final R indices[I>2 sigma(I)] are R-1=0.0469, wR(2)=0.1021, R indices for all data are R-1=0.0835, wR(2)=0.1169. The central Co2+ cation is coordinated in a distorted octahedral geometry with the ligand tda, 5-mphen, and water molecule. The coordination complex possesses a three-dimensional framework by means of hydrogen bonds and;pi-pi stacking interactions. According to TG-DTG curves, the possible thermal decomposition mechanisms, the possible kinetic parameters, and equation of dehydration stage of the complex are obtained, that is, E-a=110.98 kJ/mol, Ig(A/s(-1))=8.554, d alpha/dT= 10(8.5546)/beta.3(1-alpha)[-In(1-alpha)](2/3.)exp(-13349/T), respectively.