Metal and Ligand Effect on the Structural Diversity of Divalent Coordination Polymers with Mixed Ligands: Evaluation for Photodegradation

Eight coordination polymers constructed from divalent metal salts, N,N(′)-bis(pyridin-3-ylmethyl)terephthalamide (L), and various dicarboxylic acids are reported, affording [Co(L)(5-ter-IPA)(H(2)O)(2)](n) (5-tert-H(2)IPA = 5-tert-butylisophthalic acid), 1, {[Co(L)(5-NO(2)-IPA)]⋅2H(2)O}(n) (5-NO(2)-H(2)IPA = 5-nitroisophthalic acid), 2, {[Co(L)(0.5)(5-NH(2)-IPA)]⋅MeOH}(n) (5-NH(2)-H(2)IPA = 5-aminoisophthalic acid), 3, {[Co(L)(MBA)]⋅2H(2)O}(n) (H(2)MBA = diphenylmethane-4,4′–dicarboxylic acid), 4, {[Co(L)(SDA)]⋅H(2)O}(n) (H(2)SDA = 4,4-sulfonyldibenzoic acid), 5, {[Co(2)(L)(2)(1,4-NDC)(2)(H(2)O)(2)]⋅5H(2)O}(n) (1,4-H(2)NDC = naphthalene-1,4-dicarboxylic acid), 6, {[Cd(L)(1,4-NDC)(H(2)O)]⋅2H(2)O}(n), 7, and {[Zn(2)(L)(2)(1,4-NDC)(2)]⋅2H(2)O}(n), 8, which were structurally characterized by using single-crystal X-ray diffraction. The structural types of 1–8 are subject to the metal and ligand identities, showing a 2D layer with the hcb, a 3D framework with the pcu, a 2D layer with the sql, a polycatenation of 2-fold interpenetrated 2D layer with the sql, a 2-fold interpenetrated 2D layer with the 2,6L1, a 3D framework with the cds, a 2D layer with the 2,4L1, and a 2D layer with the (10(2)⋅12)(10)(2)(4⋅10⋅12(4))(4) topologies, respectively. The investigation on the photodegradation of methylene blue (MB) by using complexes 1–3 reveals that the degradation efficiency may increase with increasing surface areas.