Syntheses, structures and fluorescence properties of two novel polymers based on a flexible tripodal ligand 1,3,5-tris((1H-1,2,4-triazol-1-yl)methyl) benzene

Two novel d¹⁰ metal-based coordination polymers named, [Cd(SCN)₂(ttmb)]_n (polymer 1), {[Ag₄(H ₂btec)₂(H₄btec)(ttmb)₂] ·5H₂O}_n (polymer 2) (H₄betc = 1,2,4,5-benzenetetracarboxylic acid, tmb = 1,3,5-tris((1H-1,2,4-triazol-1-yl) methyl)benzene), were synthesized by combining flexible tripodal ligand, ttmb and two different auxiliary ligands (potassium rhodanide and H₄btec), via hydrothermal reactions and structurally characterized. Single-crystal X-ray diffraction analyses reveal that polymer 1 possesses a two dimensional (2D) structure with a binodal (3,4)-connected (4² · 6)(4 ² · 6³ · 8) topological type; whereas, polymer 2 exhibits a three dimensional (3D) supramolecular structure as a result of hydrogen-bonding interactions among the neighboring 2D grid layers. The tripodal ligand in both polymer structures shows two different coordination models indicating, its coordination diversity. The solid-state photoluminescence properties indicate that Polymer 1 shows noticeable fluorescent emissions upon excitation in comparison to that of polymer 2.