Synthesis and crystal structure of bis-(2-aminobenzimidazolium) catena -[metavanadate(V)].

The structure of polymeric catena -poly[2-amino-benzimidazolium [[dioxidovanadium(V)]-μ-oxido]], {(C 7 H 8 N 3 ) 2 [V 2 O 6 ]} n , has monoclinic symmetry. The title compound is of inter-est with respect to anti-cancer activity. In the crystal structure, infinite linear zigzag vanadate (V 2 O 6 ) 2- chains, constructed from corner-sharing VO 4 tetra-hedra and that run parallel to the a axis, are present. Two different protonated 2-amino-benzimidazole mol-ecules are located between the (V 2 O 6 ) 2- chains and form classical N-H⋯O hydrogen bonds with the vanadate oxygen atoms, which contribute to the cohesion of the structure.