- Nikhil Kumar: Department of Chemistry , National Institute of Technology Kurukshetra , Kurukshetra 136119 , India.
- Avijit Kumar Paul: Department of Chemistry , National Institute of Technology Kurukshetra , Kurukshetra 136119 , India. ORCID
The rational design and successful synthesis of novel functional metal-organic frameworks relies on careful selection of metals and versatile organic ligands. A newly designed pyrazole-based dicarboxylate ligand, 5-(3,5-dimethyl-1H-pyrazol-1-yl) 1,3-benzenedicarboxylic acid (HL), was utilized to obtain two new Cd-based coordination polymers [Cd(L)(HO)]·HO and [Cd(L)] under similar reaction conditions via solvothermal strategy. Single-crystal X-ray data confirmed that compound exhibits a two-dimensional (2D) skeleton comprising pentagonal bipyramidal Cd-ions and an organic ligand moiety. Compound has also formed a two-dimensional layer arrangement with the connectivity between trigonal bipyramidal Cd-ions and the organic ligand. Topological analysis revealed that compound has formed unique 4.6 net topology while compound has displayed a 4.6 net topology with 2D frameworks. The Lewis acidic nature of both and containing a Cd metal center has been correlated with the coordination number through dye adsorption-desorption and catalysis studies. The selective adsorption of anionic dye and the extent of adsorption are interrelated with the Cd-ion geometry. For the first time, the role of coordinated water molecule has been analyzed through heterogeneous catalysis reaction (i.e., cyanosilylation) with Cd-based 2D-coordination polymers (CPs). The plausible mechanisms have been proposed to explain the subsequent role of coordination number and environment in CPs.