Synthesis, structure, and photoluminescence properties of coordination polymers of 4,4′,4′′,4′′′-tetrakiscarboxyphenylsilane and 3,5-bis(1′,2′,4′-triazol-1′-yl)pyridine

Three coordination polymers (CPs) incorporating both 4,4′,4′′,4′′′-tetrakiscarboxyphenylsilane (H 4 tcps) and 3,5-bis(1′,2′,4′-triazol-1′-yl)pyridine (btap), namely [Co 2 (tcps)(btap)(H 2 O) 3 ] ( 1 ), [Co 3 (Htcps) 2 (btap)(H 2 O) 6 ] ( 2 ) and [Cd 3 (Htcps) 2 (btap)(H 2 O) 6 ] ( 3 ), were synthesized by a solvothermal method. Compound 1 features a 3D (3,4,5)-connected framework with the (6·7 5 ·8 4 )(6 4 ·8 2 )(7 2 ·9) topology. Compounds 2 and 3 are isostructural, which display an unusual 1D + 3D → 3D polythreaded supramolecular architecture with the 1D chain inserted into the channels of the two-fold interpenetrating 3D motif. Hydrogen bonds among the 3D anionic motif and the 1D cationic motif further stabilize the compounds. The structure of compounds 2 and 3 is a 3D 3-connected framework with the point symbol (10 3 ) 4 . The luminescence properties of compound 3 in their solid state and as dispersed in various solvents were investigated. Luminescence studies have revealed that compound 3 exhibits high sensitivity and stable anti-interference towards Fe 3+ and Cu 2+ cations in aqueous solution. Three coordination polymers based on 4,4′,4′′,4′′′-tetrakiscarboxyphenylsilane and 3,5-bis(1′,2′,4′-triazol-1′-yl)pyridine ligands were synthesized. Luminescence studies revealed that [Cd 3 (Htcps) 2 (btap)(H 2 O) 6 ] exhibits a luminescence quenching response towards Fe 3+ and Cu 2+ .