Eight-Fold Interpenetrating Diamondoid Coordination Polymers for Sensing Volatile Organic Compounds and Metal Ions

Reactions of divalent metal salts with 4,4-oxybis(N-(pyridine-4-yl)-benzamide), L, and naphthalene-1,4-dicarboxylic acid (1,4-H₂NDC) in various solvents gave [Zn(L)(1,4-NDC)·H₂O]_n, 1, [Cd(L)(1,4-NDC)(H₂O)·MeOH]_n, 2, and [Co(L)(1,4-NDC)(H₂O)_0.5·MeOH]_n, 3, which have been structurally characterized. Complexes 1-3 show eight-fold interpenetrating frameworks with the dia topology, which exhibit porosities substantiated by CO₂ adsorption, whereas 1 and 2 manifest stability in aqueous environments and show high selectivity toward sensing of mesitylene molecules and Fe³⁺ ions with low detection limits and good reusability up to five cycles.