Syntheses, structures and properties of zinc(II) and cadmium(II) coordination polymers with mixed organic ligands

• Zn(II) and Cd(II) frameworks with mixed organic ligands have been synthesized.
• The frameworks show different 2D and 3D structures.
• Gas and dye adsorption properties of the frameworks were investigated.

Three new coordination polymers [Zn(tib)(BPDS)] (1), [Zn(tib) (BPDS) (H2O)]·6H2O (2) and [Zn2(tib) (TPDC-4CH3)2]·DMF·10H2O (3) (DMF = N, N-dimethylformamide), and a previously reported one [Cd(tib)2]·2NO3·4DMF (4) were synthesized by hydro/solvothermal reactions of corresponding metal salt with mixed organic ligands of 1, 3, 5-tris(1-imidazolyl)benzene (tib) and 4, 4'-biphenyldisulfonic acid (H2BPDS)/2′, 3′, 5′, 6′-tetramethylterphenyl-4, 4″-dicarboxylic acid (H2TPDC-4CH3). The complexes were characterized by elemental, thermogravimetric analyses, IR, single crystal and powder X-ray diffractions. 1 and 2 are 2D networks with {4·82} and {63} topologies, which are further assembled into 3D architectures through hydrogen bonding interactions. In 3, both tib and TPDC-4CH32− act as bidentate bridging ligands and link Zn(II) centers to form a 3-fold interpenetrating 3D framework, while 4 is a (3, 6)-connected binodal 3D net with the Schläfli symbol of {4·62}2{42·610·83}. Gas and dye sorption and photoluminescence properties of the complexes were investigated.

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