Direct synthesis, crystal structure and thermal kinetics of supramolecular complex [Co(H2O)6]•(Hnip)2•(H2nip)2•(DMA)2•(H2O)8 (nip=5-nitroisophthalate, DMA=CH3NHCH3)

The crystal of [Co(H2O)(6)]center dot(HniP)(2)center dot(H(2)nip)(2)center dot(DMA)(2)center dot(H2O)(8) has been cultured using direct method and characterized by X-ray single crystal diffractometry, elemental analysis and FTIR spectroscopy. It crystallizes in triclinic system, P-1 space group with the cell parameters of a = 0.7012(1) nm, b = 1.1378(2) nm, c = 1.6612(3) mn, alpha = 84.92(3)degrees,beta = 85.19(3)degrees, gamma = 85.91(3)degrees, V= 1.3128(5) nm(3), Z=1, D-c = 1.573 g.cm(-3). Final R indices [I > 2 sigma(I)] are: R-1 = 0.0279, wR(2)=0.0765 while R indices for all data are: R-1 = 0.0327, wR(2) = 0.0806. The Co coordination octahedra are each surrounded by two Hnip, two H(2)nip, two DNM and eight water molecules that are linked by hydrogen bonds and pi-pi stacking interactions. Thermal analyses of DSC and TG-DTG have been performed on the complex to predict its thermal decomposition mechanism and determine the most probable kinetic model function using Kissinger, Ozawa, integral and differential methods.