Synthesis and crystal structure of a mixed-metal complex [Co(C_6H_4O_2N)_2(H_2O)_4]

The complex with chemical formula of [Co(C6H4O2N)2(H2O)4] was obtained by the reaction of CoCl2·6H2O and isonicotinic acid through hydrothermal method,and had been structurally characterized by X-ray single-crystal diffraction analysis.The complex belongs to the triclinic system,space group P-1,a=0.637 36(19)nm,b=0.692 1(2)nm,c=0.9282(3)nm,α=96.051(3)°,β=104.703(3)°,γ=113.084(3)°,V=0.354 54(18)nm3,Z=1,Dc=1.757 g/cm3,Mr=375.20,F(000)=193,μ(MoKα)=1.257 mm-1,R1=0.083 4,wR2=0.230 2[I2σ(I)].The crystal is composed of zwitter ion with six-coordinated distorted octahedral structure.Zwitter ions were interact by hydrogen bond and face to face π-π stacking.