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A new set of Cd(<scp>ii</scp>)-coordination polymers with mixed ligands of dicarboxylate and pyridyl substituted diaminotriazine: selective sorption towards CO<sub>2</sub>and cationic dyes
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Citations
57
References
2017
Year
On the basis of a mixed ligand system of L(NH<sub>2</sub>)<sub>2</sub> (6-(pyridin-4-yl)-1,3,5-triazine-2,4-diamine) and dicarboxylic acids, three new Cd(ii) coordination polymers viz. {[Cd<sub>0.5</sub>(tdc)<sub>0.5</sub>(L(NH<sub>2</sub>)<sub>2</sub>)<sub>0.5</sub>(H<sub>2</sub>O)]·DMF·H<sub>2</sub>O}<sub>n</sub> (1), {[Cd<sub>0.5</sub>(bdc)<sub>0.5</sub>(L(NH<sub>2</sub>)<sub>2</sub>)(H<sub>2</sub>O)]·DMF·H<sub>2</sub>O}<sub>n</sub> (2), and {[Cd(ipa)(L(NH<sub>2</sub>)<sub>2</sub>)(DMF)]·H<sub>2</sub>O}<sub>n</sub> (3) (tdcH<sub>2</sub> = thiophene-2,5-dicarboxylic acid, bdcH<sub>2</sub> = benzene-1,4-dicarboxylic acid, ipaH<sub>2</sub> = benzene-1,3-dicarboxylic acid) were synthesized under diverse reaction conditions and characterized by single crystal X-ray diffraction, PXRD, elemental analysis, IR spectroscopy and TGA. While 1 and 2 revealed 1D chain structures, 3 acquired a 2D square net structural arrangement. Gas adsorption measurements of the desolvated framework 3 showed a moderate uptake of CO<sub>2</sub> under ambient conditions with good selectivity over N<sub>2</sub> and CH<sub>4</sub>. The solid state luminescence properties were studied for all three coordination polymers. Moreover, a dye adsorption study on 3 exhibited selective adsorption towards a cationic dye.
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