Chiral nano-silver cluster material with high stability, strong luminescence and high quantum yield

Abstract

The invention discloses a chiral nano-silver cluster material with a high stability, a strong luminescence and a high quantum yield, and belongs to the field of intersection of coordination chemistryand nano-materials. The enantiomer of the chiral nano-silver cluster adopts a chiral ligand (S / R)-4-phenylthiazolidine-2-thione (PL / PD) as a protective ligand, and the chiral silver nano-cluster material with the high yield and excellent luminescent properties is synthesized by a simple room temperature volatilization one-pot process. The chemical formula of the enantiomeric cluster is C54H48Ag6N6S12 (called Ag6PL6 / PD6 for short), the enantiomeric cluster belongs to the monoclinic system, and the space group is the chiral space group P213. The cluster has strong brown-yellow fluorescence at room temperature, and the fluorescence quantum yield reaches up to 97%, and is the highest quantum yield of reported silver nanoclusters with a precise atom structure; the structure of the material canbe stabilized at 160 DEG C, and still maintains luminescence; and the chiral structure and strong luminescent properties of the material make the cluster structure have a strong circularly polarized luminescence (CPL) property. The silver nano-cluster has the advantages of chiral structure, high stability, strong luminescence and high quantum yield, so the silver nano-cluster has excellent application prospects in fields of luminescent materials and chiral optical materials.

Description

technical field [0001] The invention belongs to the intersection field of coordination chemistry and nanometer materials, and mainly synthesizes a chiral nanometer silver cluster material with high stability, strong luminescence and high quantum yield. Background technique [0002] Atomically precise silver nanoclusters are a class of clusters with precise atomic structures whose outer layer is protected by organic ligands and whose inner core is formed by 3 or more metal silver atoms through argentophilic interaction. compound. Nanocluster is a state of matter between atoms, molecules and bulk materials, and is a bridge connecting atoms, molecules and macroscopic substances. Its size is generally on the order of nanometers, and it is often accompanied by quantum confinement effects. Many new phenomena and properties. Its excellent photophysical properties and its potential applications in catalysis, bioimaging and other fields have become a research hotspot in materials a...

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