Synthesis and Crystal Structure of a Cobalt(Ⅱ) Complex Based on 2,2'-Bibenzimidazole and N,N-bis(phosphonomethyl)aminoacetic Acid

摘要

The title complex,[Co2(bibzim)(H2bibzim)4]·[Co2(H2bibzim)2(Hbibzim)(HL)]2-2H2O(1)(H2bibzim = 2,2'-bibenzimidazole,H5 L = N,N-bis(phosphonomethyl)aminoacetic acid(HO2CCH2N(CH2PO3H2)2)),was synthesized with hydrothermal reactions.The compound crystallizes in triclinic,space group P1 with α = 13.71020(10),b = 14.9165(5),c = 20.9924(5) A,α= 86.344(9),β = 71.214(8),γ = 73.757(7)°,C162H124Co6N46O18P4,Mr = 3478.52,V= 3900.55(16) A3,Z = 2,Dc = 1.482 g/cm3,μ(MoKα) = 0.747 mm-1,F(000) = 1784,the final R = 0.0777 and wR =0.2091 for 13598 observed reflections(I > 2σ(I)).X-ray diffraction analysis reveals that there are three crystallographically independent Co(Ⅱ) atoms in the complex.The complex consists of binuclear coordination cation,binuclear coordination anion,as well as lattice water molecules,which further aggregate into a 3D framework via hydrogen bonding as well as π-π interactions.