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 2-D Cd coordination polymers based on a flexible tripodal ligand were synthesized.
• The tripodal ligand in both polymer shows two different coordination models.
• A normal open-ended, hollow single-wall metal–organic nanotube is found within the complex 2.
• Thermal behavior and solid-state fluorescent emissions are available.

Two novel d10 metal-based coordination polymers named, [Cd(SCN)2(ttmb)]n (polymer 1), {[Ag4(H2btec)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)(42 · 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.

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