Various Cd(II) coordination polymers induced by carboxylates: multi-functional detection of Fe3+, anions, aspartic acids and bovine serum albumin

摘要

By adjusting carboxylates, six Cd(II) coordination polymers based on a naphthalene-methylene mixed-bridged-amide ligand, [Cd(L)(DNBA)(2)] (1), [Cd-2(L)(2)(BDC)(2)(H2O)(2)]center dot 2H(2)O (2), [Cd(L)(1,4-CHDA)] (3), [Cd(L)(HIPA)(H2O)]center dot H2O (4), [Cd(L)(MIP)]center dot H2O (5), and [Cd(L)(PMA)(0.5)(H2O)]center dot H2O (6) [L = N,N'-bis(4-methylenepyridin-4-yl)-1,4-naphthalene dicarboxamide, HDNBA = 3,5-dinitrobenzoic acid, H2BDC = 1,4-benzenedicarboxylic acid, 1,4-H(2)CHDA = 1,4-cyclohexanedicarboxylic acid, H(2)HIPA = 5-hydroxyisophthalic acid, H2MIP = 5-methylisophthalic acid and H(4)PMA = pyromellitic acid] have been synthesized under hydrothermal conditions. 1 shows a 4-c sql coplanar structure. 2 exhibits a 2-fold vertical interpenetrating structure based on wave-like 4-c sql layers. 3 shows a (3,5)-c pnh network containing a unique mu(3)-L. 4 features a 4-c sql wave-like network. 5 and 6 exhibit 3D structures with 6-c pcu and 4-c mog topologies. The number of carboxyl groups and functional group positions of the carboxylates have an important influence on the structures of the title complexes. The fluorescent responses of 1-6 towards Fe3+, anions, aspartic acid and bovine serum albumin were investigated. Among them, 4 shows sensitivity and selectivity (K-SV = 1.16 x 10(4) L mol(-1) for Fe3+, 1.03 x 10(4) L mol(-1) for CrO42-, 1.08 x 10(4) L mol(-1) for Cr2O72-, 1.17 x 10(4) L mol(-1) for MnO4- and 1.05 x 10(4) L mol(-1) for aspartic acid).