Heteroctanuclear AuAg Cluster Complexes of 4,5-Diethynylacridin-9-One with Luminescent Mechanochromism

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2022 Apr 12

PMID 35408524

Authors

Pei Xie

Jin-Yun Wang

Ya-Zi Huang

Xue-Meng Wu

Zhong-Ning Chen

Affiliations

Soon will be listed here.

Abstract

Two heteroctanuclear AuAg cluster complexes of 4,5-diethynylacridin-9-one (HL) were prepared through the self-assembly reactions of [Au(tht)](CFSO), Ag(tht)(CFSO), HL and PPh or PPhPy (2-(diphenylphosphino)pyridine). The AuAg cluster consists of a [AuL] and four [Ag(PPh)] or [Ag(PPhPy)] units with AuL framework exhibiting a twisted paper clip structure. In CHCl solutions at ambient temperature, both compounds show ligand fluorescence at ca. 463 nm as well as phosphorescence at 650 nm for and 630 nm for resulting from admixture of IL (intraligand) of L ligand, LMCT (from L ligand to AuAg) and MC (metal-cluster) triplet states. Crystals or crystalline powders manifest bright yellow-green phosphorescence with vibronic-structured emission bands at 530 (568sh) nm for complex and 536 (576sh) nm for complex . Upon mechanical grinding, yellow-green emission in the crystalline state is dramatically converted to red luminescence centered at ca. 610 nm with a drastic redshift of the emission after crystal packing is destroyed.

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