Methanol-Triggered Turn-On-Type Photoluminescence in l-Cysteinato Palladium(II) and Platinum(II) Complexes Supported by a Bis(diphenylphosphine) Ligand

Abstract

The selective detection of methanol by photoluminescence under environmental conditions has been a great challenge for materials science. Herein, a reversible, turn-on-type photoluminescence triggered by methanol vapor in square-planar palladium(II) and platinum(II) complexes, newly prepared from [MCl2(1,3-bis(diphenylphosphino)propane)] and L-cysteine, is reported. Both the "turn-on" and "turn-off" states of the complexes were crystallographically characterized, which revealed the presence of intermolecular OH···O and CH···π interactions between methanol and the complex molecules in the turn-on state. These interactions prevent the vibrational quenching of the luminescence, leading to the turn-on-type luminescence in this system.

Strong-Acid-Templated Construction of a Metallosupramolecular Architecture: Reversible Ammonia Adsorption in Aqueous Media in a Single-Crystal-to-Single-Crystal Conversion Manner

“…The reverse conversion was partially achieved when [ 3 ]·2NH 4 ClO 4 was stored under vacuum at room temperature for 2 days. The reversible inclusion of polar solvent molecules, such as water and alcohols, in the nonporous crystal lattice through the single-crystal-to-single-crystal fashion have been reported in several diphosphine based discrete coordination systems. − In these systems, the formation of hydrogen bonds and/or CH···π interactions between host framework and guest solvent molecules promotes the inclusion reaction. On the other hand, the reversible ammonia adsorption in the present system is induced by the unprecedented acid–base neutralization between template acid (HClO 4 ) and guest base (NH 3 ) molecules.…”

Reversible Multiphase Transition in a BioMOF and Its Distinctive Luminescence Turn-On in Alcohol Vapor

“…Compared with traditional analytical methods, such as electrochemical and gas chromatography, the alcohol-vapor-induced luminescence quenching/enhancing has attracted a great deal of attention due to its rapid, facile, and visualizable response . Some metal complexes have been reported to show a luminescence intensity difference when in contact with alcohols, but their sensitivity and selectivity are rather limited. − …”

Chromism of Tartrate-Bridged Clamshell-like Platinum(II) Complex: Intramolecular Pt–Pt Interaction-Induced Luminescence Vapochromism and Intermolecular Interactions-Triggered Thermochromism

“…Luminescence chromism in the solid state is a hot topic in photo- and coordination chemistry. − In particular, Pt II complexes that exhibit chromic behavior in response to external stimuli, such as sorption of volatile organic solvents (vapochromism), ,,,,,,,, heat (thermochromism), , and mechanical forces (mechanochromism), ,,,,,,, have been developed. Most chromic behavior was induced by changes in intermolecular Pt–Pt and/or π–π interactions during crystallographic phase transitions.…”