New 2-methyl benzimidazole based zinc carboxylates: Supramolecular structures, biomimetic proton conductivities and luminescent properties

摘要: Two new supramolecular zinc frameworks, [Zn(2-MeBIM)2(OAc)2]·3H2O (1) and [[Zn(2-MeBIM)(Pht)(H2O)]·2H2O]n (2) (where 2-MeBIM = 2-methyl benzimidazole, OAc = acetate anion Pht = dianion of phthalate), were crystallized, structurally examined. Complex 1 has been characterized to be a discrete molecule, composed OAc 2-MeBIM ligands. Whereas, the 2 is identified 1D coordination polymer, due μ2-1-6 bridging action Pht ligand. Each Zn(II) on chain, further possesses one coordinated water, 2-MeBIM. 2, additionally exhibits carboxylate⋯imidazole–zinc triads as well. Hydrogen bonds align water molecules complexes, through which respective molecular species are integrated into 3D architectures. Supramolecular features complexes resemble those enzymes, involved in proton transport based mechanistic events. Hence they regarded bio-inspired models for conducting applications. AC impedance studies, anticipated, reveal humidity conduction characteristics with magnitudes comparable level other classical electrolytes. Proton fluorescence behaviors discussed relation X-ray structural aspects. Hence, present work, perhaps first time, reports functional bio-relevant environmentally benign model complexes.