Synthesis, Crystal Structure, Properties and Thermoanalysis of Complexes of Cu（II） and Ni（II） with Taurine-5-chlorosalicylaldelyde Schiff Base

The reactions of transition metal salts with taurine 5-chlorosalicylaldelyde Schiff base gave two complexes [Ni(TCSSB)(H2O)3]·H2O (1) and [Cu(TCSSB)(H2O)2]2·[Cu(TCSSB)2]·6H2O (2) (TCSSB=taurine-5-chlorosali-cylaldelyde Schiff base), which were characterized by elemental analysis and X-ray diffraction analysis. The complex 1 crystallized in monoclinic system with space group P2 1/c, and a=1.4816(2) nm, b=1.3953(2) nm, c=0.7466(1)nm, β=100.499(3)°, V=1.5176(4)nm^3, Z=4, and an infinite 3-D network structure was formed by hydrogen bonds among sulfo group, crystal water and coordinated water. Complex 2 crystallized in triclinic system with space group P-↑1, with the cell parameters: a=0.6413(2) nm, b=1.4596(3) nm, c=1.6188(4) nm, α=102.473(5)°, β=98.979(4)°,V=101.739°, V= 1.4165(6)nm^3, Z=1. The coordination environment between Cu(1) and Cu(2) is different. Cu(1) is slightly distorted square pyramidal while Cu(2) is distorted square-plane. The complex 1 is mononuclear while the complex 2 is made up of two coordinated subunits, namely [Cu(TCSSB)2] and [Cu(TCSSB)(H2O)2]2. Besides that the TG-DTG of the complex 1 was analyzed, the thermal decomposition reaction of the complex was studied under a non-isothermal condition by TG-DTG. The TG and DTG curves indicatethat the complex was decomposed in three stages:[Ni（TCSSB）（H2O）3·H2O（60-104℃)/-H2O→Ni（TCSSB）（H2O）3（110-155℃)/-3H2O→Ni（TCSSB）（425-610℃）/-TCSSB→NiO