Two neutral and dimeric Zn (II) complexes [Zn2 (epbm) 4](1) and [Zn2 (bpbm) 4](2)(Hepbm= 3-ethyl-2-(2-hydroxyphenyl)-3H-benzimidazole, Hbpbm= 3-n-butyl-2-(2-hydroxyphenyl)-3H- benzimidazole) have been prepared and characterized by X-ray crystallography and photoluminescent studies. Time-dependent density functional theory (TDDFT) energy level calculation and molecular orbital calculation show their absorption and luminescence ...