Coligand syntheses, crystal structures, luminescence and photocatalytic properties of five coordination polymers based on rigid tetracarboxylic acids and imidazole linkers.

Five coordination polymers (CPs) with distinct structures, namely, [Cu(H 2 tptc)(1,4-bidb)] n (1), {[Co 2 (tptc)(1,3,5-tib)(H 2 O)]·7H 2 O} n (2), {[Ni(tptc) 0.5 (1,3-bimb)]·H 2 O} n (3), {[Zn(qptc) 0.5 (1,4-bimb)]·3H 2 O} n (4), and {[Zn(qptc) 0.5 (1,3-bimb)]·H 2 O} n (5) (H 4 tptc = terphenyl-3,3′′,5,5′′-tetracarboxylic acid, H 4 qptc = quaterphenyl-3,3′′′,5,5′′′-tetracarboxylic acid, 1,4-bidb = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene, 1,3,5-tib = 1,3,5-tris(1-imidazol-yl)benzene, 1,3-bimb = 1,3-bis(imidazol-1-ylmethyl)benzene, and 1,4-bimb = 1,4-bis(imidazol-1-ylmethyl)benzene), have been synthesized through a mixed ligand strategy. Complex 1 features a new 3D (4,6)-connected net with a Schläfli symbol of (4 2 ·6 4 )(4 2 ·6 8 ·7·8 4 ). Complex 2 displays a 3D 2-fold interpenetrated framework with an unprecedented (3,3,4,4)-connected (6·8 2 ) 2 (6 2 ·8 3 ·10)(6 2 ·8 4 ) topology. Complex 3 exhibits a (3 2 ·6 2 ·7 2 )-kgm layer featuring a 2D + 2D → 3D packing supramolecular structure interweaved through [Ni(1,3-bimb)] lock knots. Complex 4 shows an unprecedented 3D (4,4)-connected 8 6 net. Complex 5 is also a 2D + 2D → 3D supramolecular structure featuring kgm sheets hinged together through [Zn(1,3-bimb)] lock knots. In addition, the luminescence properties of 4 and 5 have been investigated. Moreover, complexes 1–3 show relatively good photocatalytic activities for methylene blue (MB) dye degradation in aqueous solution under UV light. [ABSTRACT FROM AUTHOR]

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