Circularly Polarized Phosphorescence from Cocrystallization of Atomic Precise Silver Nanoclusters with Tartaric Acid. Issue 15 (1st May 2022)

• Record Type: Journal Article
• Authors: Feng, Ning; Wang, Zhi; Sun, Di; Sun, Panpan; Xin, Xia; Cheng, Xiaohui; Li, Hongguang
• Is Part Of: Advanced optical materials. Volume 10:Issue 15(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-01
• Subjects: chirality -- circularly polarized -- nanoclusters -- phosphorescence -- supramolecular; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202102319
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Recently, advanced optical materials with circularly polarized phosphorescence (CPP) have attracted much attention. However, such materials are limited due to the difficulty of preparation and the scarcity of precursors. Herein, CPP materials are constructed for the first time using water‐soluble, pseudo‐chiral silver nanoclusters with atomic precision ((NH4 )9 [Ag9 (mba)9 ], H2 mba = 2‐mercaptobenzoic acid, abbreviated to Ag9 ‐NCs hereafter). Induced by the complexation of l ‐ or d ‐tartaric acid (TrA) through hydrogen bonding, Ag9 ‐NCs crystallize from aqueous solutions, during which the chirality of the hybrid is amplified and the phosphorescence of Ag9 ‐NCs is enhanced. It is speculated that the chiral transfer from TrA to Ag9 ‐NCs is the main source of the well‐defined circular dichroism signals with good repeatability. The Ag9 ‐NCs/TrA cocrystals exhibit good CPP performance with dissymmetric factors up to 1.05 × 10 −2, which is the highest value for metal NCs‐based CPP materials. This work is expected to be an inspiration for preparing metal NCs‐based CPP materials by supramolecular strategy. The so‐obtained organic–inorganic CPP materials can find a variety of applications in optoelectronic devices. Abstract : Water‐soluble, pseudo‐chiral silver nanoclusters (Ag9 ‐NCs) with atomic precision can crystallize with tartaric acid (TrA) in water, during which the chirality of TrA successfully transfers to Ag9 ‐NCs and is amplified. The cocrystallization of Ag9 ‐NCs and TrA simultaneously enhances the photoluminescence of Ag9 ‐NCs, giving a circularly polarized phosphorescent material with asymmetry factor up to 1 × 10 −2 .