Syntheses, structures, photoluminescence of four dicarboxylate-controlled Zn(II) coordination complexes incorporating flexible 1-(4-pyridylmethyl)- benzimidazole ligand

摘要

Four Zn(II) coordination complexes, namely {[Zn(pmbm)_2(tpa)] ·H_2O}_n (1), {[Zn(pmbm)(phda)]·2(H _2O)}_n (2), [Zn(pmbm)(aze)]_n (3), {[Zn(pmbm)(1,4-ndc)]·2(CH_3OH)}_n (4) [pmbm = 1-(4-pyridylmethyl)-benzimidazole, H_2tpa = terephthalic acid, H _2phda = phenylenediacetic acid, H_2aze = azelaic acid, 1,4- ndcH_2 = 1,4-naphthalenedicarboxylic acid] have been synthesized by solution phase ultrasonic reactions of Zn(AC)_2·2H_2O with pmbm and various dicarboxylates ligands under the ammoniacal condition. All the complexes have been characterized by elemental analyses, IR spectra and X-ray diffraction. Complexes 1 and 2 exhibit one-dimensional chains structure and complex 3 and 4 are two-dimensional sheets structure with (4,4) topology. Complexes 1-4 spanning from one-dimensional chains to two-dimensional sheets suggest that dicarboxylates play significant roles in the formation of such coordination architectures. The photoluminescences of the complexes were also investigated in the solid state at room temperature.