Modular assembly between biimidazole complexes and chloride anions. Crystal structures of [Cu(biimidazole)2]Cl2 and [Zn(Cl)(biimidazole)2]Cl

The strong affinity of coordinated biimidazole for chloride ion via N-H⋯Cl− hydrogen bonding has been used as a strategy to build up two different modular assemblies, {[Cu(H2biim)2]Cl2 and [Zn(Cl)(H2biim)2]Cl}, between chloride and biimidazole-metal modules.