Ligand-Triggered Platinum(II) Metallacycle with Mechanochromic and Vapochromic Responses

Abstract

Supramolecular coordination complexes with solidstate stimuli-responsive characteristics are highly desirable but are rarely reported. Herein, we describe two coordination-driven selfassembled monoanthracene or dianthracene-based hexagonal metallacycles by subtle structure modification. Notably, the dianthracenecontaining hexagon 1 exhibits tricolor mechanochromic and vapochromic characteristics, while the monoanthracene-containing hexagon 4 does not show obvious changes toward mechanical force. Further studies have indicated that changes in hexagon 1, especially the ulterior anthracene of hexagon 1 in the molecular stacking through intermolecular interactions toward external stimuli, are responsible for the above behavioral differences. Furthermore, the present work also demonstrates a novel light-harvesting strategy for achieving high-contrast mechanochromic fluorescence involving solidstate energy transfer from hexagon 1 to an organic carbazole derivant 6 without mechanofluorochromism or tetraphenylethylene derivant 7 exhibiting inconspicuous mechanofluorochromism.

Recent Advances in Mechanochromism of Metal-Organic Compounds

“…Luminescent materials have always been valued by researchers due to their widely use in data storage, optoelectronic devices, biological imaging and other fields (Zhu et al, 2016;Shi et al, 2018;Wang et al, 2021;Jackson et al, 2021;Yin et al, 2021;Min et al, 2022). Metal-organic compounds (MOC), composed of metal ions and organic ligands, are expected to exhibit more interesting photophysical properties.…”

Up-Converting Nanocrystals Modified With Fluorescent Markers for the Detection of Amino Acids: Preparation, Characterization, and Sensing Performance

“…For example, Chen and Sun have reported a promising photodynamic therapy using a water-soluble aggregation-induced emission photosensitizer activated by an acidic tumor microenvironment ( Min et al, 2002 ). Additionally, there are ligand-triggered Pt(II) metallacycles with mechanochromic and vapochromic responses which could find wide and attractive application in biological and mechanical sensing fields ( Chen et al, 2019 ; Yin et al, 2021 ). More optoelectronic systems have been reported for chemosensing applications ( Chen et al, 2021a ; Chen et al, 2021b ; Sun et al, 2021 ).…”

The Synthesis of Picolinamide-Supported Tetracoordinated Organoboron Complexes with Aggregation-Induced Emission Property

“…Since the conceptualization of the aggregation-induced emission (AIE) effect by the Tang group in 2001 ( Luo et al, 2001 ; Mei et al, 2015 ), many types of AIE-active compounds/units have been developed. In recent years, a number of AIE-active tetracoordinated organoboron complexes have been synthesized and applied as aggregate-state emitters ( Virgili et al, 2013 ; Liu et al, 2019 ; Nitti et al, 2020 ; Ito et al, 2021 ; Yin et al, 2021 ; Min et al, 2022 ). These AIE-active complexes, which are usually obtained via linking AIE-active units such as tetraphenylethylene (TPE) or introducing rotational aryls onto the chelating backbones, mostly contain BF 2 segments.…”