Synthesis, Characterization, and Remarkable Functionalities in Hydrogen Production and Dye Adsorption of 1D Coordination Polymers with 3,3′-(Thiophene-2,5-diyl)dibenzoic Acid

Abstract

Four new 1D coordination polymers─formulated as [Mn 2 (μ 3 -tdb)(μ 4 -tdb)(μ-H 2 O)(DMF) 2 ] n (1), [Cu(μ 4 -tdb)(H 2 O)] n (2), {[Zn 2 (μ 3 -tdb)(μ 4 -tdb)(μ-H 2 O)(H 2 O)(DMF)]·DMF} n , (3), and [Cd 2 (μ 4 -tdb)(μ 4 -tdb)(μ-H 2 O)(DMF) 2 ] n (4) (3,3′-(thiophene-2,5-diyl)dibenzoic acid (H 2 tdb))─were synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction techniques. The thermal properties and phase purities of complexes 1-4 were investigated by thermal analyzes (TG, DTA, and DTA) and powder X-ray diffraction (PXRD) techniques. In complexes 1-4, the central metal ions are bridged by tdb ligands and exhibit 1D linear structures. These 1D chains are extended into a 3D framework by π···π-stacking interactions between the thiophene rings. The coordination polymers were evaluated as adsorbents for the adsorption of Victoria blue B (VBB) dye and catalysts for the production of hydrogen gas via the methanolysis reaction of NaBH 4 . The results showed superior performance, reaching quite high values ​​reported in the literature, in the adsorption for VBB dye and catalytic activity for hydrogen production with these coordination polymers. These findings demonstrate strong potential for the development of new-generation materials that could provide innovative solutions for environmentally friendly waste removal and sustainable energy production.