Study on two coordination compounds using semicarbazide (SCZ) as bidentate ligand: {[hbox{Ni}(hbox{SCZ})_{3}](hbox{NO}_{3})_{2}} and {hbox{Cu}(hbox{SCZ})_{2}hbox{Cl}_{2}}

Two coordination compounds have been synthesized using semicarbazide as ligand- ${[hbox{Ni}(hbox{SCZ})_{3}](hbox{NO}_{3})_{2}}$ (1) and ${hbox{Cu}(hbox{SCZ})_{2}hbox{Cl}_{2}}$ (2). (1) crystallized as the monoclinic, P2(1)/c space group, a = 10.832(2) Å, b = 9.980(2) Å, c = 13.801(3) Å, β = 102.89(3)°; (2) crystallized as the monoclinic, P2(1)/c space group, a = 7.541(1) Å, b = 9.275(1) Å, c = 6.875(1) Å, β = 101.48(1)°. In both compounds, semicarbazides coordinate to nickel(II) or copper(II) centers to form the 5-member ring system. With the intermolecular hydrogen bonds, molecules are linked together to form the three-dimensional packing diagrams. Thermal decomposition mechanisms of both compounds were predicted based on DSC, TG-DTG and FTIR analyses.