Syntheses, structures and properties of eight coordination polymers based on bis(imidazole) and biscarboxylate ligands

Abstract

Eight coordination polymers {[Co(bib)(ndc)]·0.5H2O}n (1), {[Co(bib)0.5(aip)]·H2O}n (2), [Co(bib)(adc)]n (3), {[Co2(bib)(adc)2]·0.5H2O}n (4), {[Ni2(bib)(adc)2]·0.5H2O}n (5), [Ni(bib)(hip)]n (6), [Cd2(bib)(bdc)2]n (7) and [Cd2(bib)(bda)2]n (8) were synthesized by the hydrothermal reaction (bib=1,4-bis(2-methyl-imidazol-1-yl)butane, ndc=1,4-naphthalenedicarboxylate, aip=5-aminoisophthalate, adc=1,3-adamantanedicarboxylate, hip=5-hydroxyisophthalate, bdc=1,2-benzenedicarboxylate, bda=1,4-benzenediacetate). 1 consists of an unusual 4-fold interpenetrating 4-connected 3D dia network. 2 exhibits an unusual (3,4)-connected 2D network with the point symbol of (6·82)(64·8·10). 3 is an undulated 2D (4,4) network. 4 and 5 are isostructural showing the 1D triple-stranded chain with double adc and one bib bridges. 6 shows a special 2D (6,3) network, with six Ni(II) atoms at six corners and four hip and two double bib at six edges. 7 exhibits an unusual 6-connected self-catenated 3D network based on Cd2(COO)2 dimer. 8 exhibits a 3-fold interpenetrating 3D pcu network based on Cd2(COO)2 dimer. The diverse structures reveal that the metal centers and biscarboxylate building blocks play a significant role in the construction of the observed motifs. 1–4 exhibit good photocatalytic activity for the degradation of methyl orange. 7 and 8 exhibit the strong blue luminescence emissions.