Triblock copolymer-based luminescent organic–inorganic hybrids triggered by heating and fluoroquinolone antibiotics

Abstract

The work introduces smart organic-inorganic hybrids with temperature- and substrate-induced quenching and sensitization of hexamolybdenum iodine cluster-centered luminescence based on iodine cluster salt [K(diglyme) (CH3CN)]2[Mo6I14] (1) and triblock copolymer (PEO)13(PPO)30(PEO)13 (L64). Formation of supramolecular assembly of [Mo6I14]2−, K+, and L64 molecules at fixed concentration conditions is manifested by specific cluster-centered luminescence. These supramolecular assemblies exhibit reversible luminescence quenching when temperature or concentration of L64 increases. The temperature-induced reversible aggregation of the L64-based organic-inorganic hybrids is followed by the reversible quenching of the cluster-centered luminescence. The ion-pairing equilibrium between the cluster anions and fluoroquinolones is shifted by the aggregation of the L64-based hybrids, which results in more enhanced quenching of the luminescence. These tendencies provide the route to sense the triblock copolymer-based phase transitions through the response of the cluster-centered luminescence.