Construction of Three Coordination Compounds Formed by in‐situ Ligand Reaction of 1‐Cyanobenzoimidazole

Solvothermal reactions of 1‐cyanobenzoimidazole, NaN 3 , and hydrated M II Cl 2 ( M = Mn, Zn, Cu) in a mixture of EtOH/H 2 O in the presence of NH 4 Cl afforded a mononuclear complex [Mn(L 1 ) 2 (H 2 O) 4 ] ( 1 ), a 3D polymer [Zn(L 1 )(OH)] n ( 2 ), and a linear polymer {[Cu(Bim)]} n ( 3 ), respectively, where the ligand L 1 is formed in‐situ from [3+2] dipolar cycloaddition of N 3 – with nitrile and the ligand Bim is in‐situ formed from C–N bond cleavage of 1‐cyanobenzoimidazole. (L 1 = 5‐benzoimidazoyltetrazolate, Bim = benzoimidazole). All the compounds were characterized by IR spectroscopy, elemental analysis, and thermo‐gravimetric analysis (TGA), and their structures were determined by X‐ray crystallography. The solid state luminescent properties of 2 and 3 were also investigated at room temperature.