A series of coordination polymers based on a V-shaped multicarboxylate and bisimidazole ligands: Synthesis, characterization and luminescent properties

Abstract

Based on a V-shaped multicarboxylic acid and various bisimidazole ligands, six new coordination polymers, namely, [Zn4(otba) (1,4-bix)4]·3H2O (1), [Ni4(otba)2(1,4-bix)3(H2O)2]·2H2O (2), [Zn2(H2otba)2(bib) (H2O)2] (3), [Cd2(H2otba)2(bib)]·2H2O (4), [Zn3(otba)2(bidpe)2(H2O)2] (5), [Ni2(H2otba)2(bidpe)3(H2O)2]·H2O (6) (H4otba = 3,5,3′,5′-oxytetrabenzoic acid, 1,4-bix = 1,2-bis(imidazol-1-ylmethyl)benzene, bib = 1,4-bis(imidazol-1-yl)benzene and bidpe = 4,4’-bis(imidazol-1-yl)diphenyl ether) have been hydrothermally synthesized and structurally characterized. Compound 1 displays an uncommon hexanodal 3D 4-connected network. Compound 2 features a trinodal 3D (4, 4, 6)-connected framework. Compound 3 shows an interesting polythreaded 1D→3D species. Compound 4 exhibits a binodal 3D (3, 8)-connected network. Compound 5 displays a three-fold interpenetration of trinodal (3, 3, 4)-connected network. Compound 6 shows a five-fold interpenetration of five-connected bilayer network. The luminescent properties of compounds 1, 3, 4 and 5 were also measured.