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)(H₂O)₂]_n (5-tert-H₂IPA = 5-tert-butylisophthalic acid), 1, {[Co(L)(5-NO₂-IPA)]⋅2H₂O}_n (5-NO₂-H₂IPA = 5-nitroisophthalic acid), 2, {[Co(L)_0.5(5-NH₂-IPA)]⋅MeOH}_n (5-NH₂-H₂IPA = 5-aminoisophthalic acid), 3, {[Co(L)(MBA)]⋅2H₂O}_n (H₂MBA = diphenylmethane-4,4′–dicarboxylic acid), 4, {[Co(L)(SDA)]⋅H₂O}_n (H₂SDA = 4,4-sulfonyldibenzoic acid), 5, {[Co₂(L)₂(1,4-NDC)₂(H₂O)₂]⋅5H₂O}_n (1,4-H₂NDC = naphthalene-1,4-dicarboxylic acid), 6, {[Cd(L)(1,4-NDC)(H₂O)]⋅2H₂O}_n, 7, and {[Zn₂(L)₂(1,4-NDC)₂]⋅2H₂O}_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 (10²⋅12)(10)₂(4⋅10⋅12⁴)(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.