Syntheses, structures, topologies, and luminescence properties of four coordination polymers based on bifunctional 6-(4-pyridyl)-terephthalic acid and bis(imidazole) bridging linkers

摘要: Four mixed-ligand coordination networks, namely, {[Cu(pta)(1,4-bimb)0.5(H2O)0.5]·H2O}n (1), {[Co(pta) (4,4′-bimbp) (H2O)]·H2O}n (2),{[Cd(pta)(1,4-bidb)0.5]·2H2O}n (3), and {[Zn(pta)(1,3-bimb)0.5]·1.5H2O}n (4), were obtained under the solvothermal reactions in presence of bis(imidazole) linkers (H2pta = 6-(4-pyridyl)-terephthalic acid, 1,4-bidb 1,4-bis(imidazol-1-yl)-2,5-dimethyl benzene, 1,3-bimb 1,3-bis(imidazol-1-ylmethyl)benzene, 1,4-bimb 1,4-bis(imidazol-1-ylmethyl)benzene, 4,4′-bimbp 4,4′-bis(imidazol-1-ylmethyl)biphenyl). Their structures determined by single-crystal X-ray diffraction analyses further characterized elemental analyses, IR spectra, powder (PXRD), thermogravimetric (TG) analyses. Complex 1 displays a novel (3,4,4)-connected topology with Schlafli symbol (4.82)2(42.82.102)(8.104.12). 2 features 2D (3,5)-connected (42.67.8)(42.6)-3,5L2 sheet. Complexes 3 4 both exhibit 3-fold 3D → parallel entangled (3,4)-connected net symbols (4.6.8)(4.62.63)-fsc-3,4-C2/c (4.6.8)(4.62.83)-3,4T1 for 4, respectively. Moreover, solid state luminescence luminescent lifetime have been investigated.