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Updated: May 28, 2025

Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots
Published on: May 7, 2019
Significantly enhanced NIR emission of solid-state clusters based on Cu4Pt2 triggered with volatile organic compounds
Xue-Ning Hu1, Xu-Hang Zhong1, Rui-Ru Zhong1
1College of Chemistry and Materials Science, and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry, Jinan University, Guangzhou 510632, P. R. China. sfyuan@jnu.edu.cn.
Novel near-infrared (NIR) emitting metal clusters show enhanced light-up sensing capabilities. This carbazole-alkyne ligand-based bimetallic cluster significantly boosts quantum yield for applications in vapor detection and thermometry.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Near-infrared (NIR) emitting metal clusters offer low toxicity, large Stokes shift, and photostability, making them promising for stimuli-responsive luminescent materials.
- Limited quantum yield (QY) in NIR emission hinders their application, necessitating the development of light-up sensors.
Purpose of the Study:
- To synthesize a novel bimetallic cluster with enhanced NIR emission properties.
- To investigate its potential as a light-up sensor for organic vapors and as a photoluminescent thermometer.
Main Methods:
- Synthesis of a novel carbazole-alkyne ligand-incorporated bimetallic cluster, Cu4Pt2(CZ-PrA)4(dppy)4(PF6)2 (CZ-Cu4Pt2).
- Characterization using temperature-dependent luminescence, UV-vis diffuse reflectance spectroscopy, powder X-ray diffraction, femtosecond transient absorption spectroscopy, and single-crystal X-ray diffraction.
- Evaluation of photoluminescence (PL) intensity changes upon exposure to various organic solvents and formaldehyde (HCHO).
Main Results:
- The synthesized CZ-Cu4Pt2 cluster exhibits NIR emission at 740 nm with a significant blue shift.
- PL intensity increased with decreasing temperature and significantly enhanced upon exposure to solvents like ethyl acetate, HCHO, and chlorobenzene, boosting QY from 16.1% to 46.7%-70.3%.
- HCHO exposure increased emission intensity over 200 times, attributed to solvent-ligand interactions restricting intramolecular rotations and promoting radiative transitions.
Conclusions:
- The novel CZ-Cu4Pt2 bimetallic cluster demonstrates excellent light-up sensing capabilities and stimuli-responsive luminescence.
- Its enhanced NIR emission and sensitivity to organic vapors and temperature suggest significant potential for non-contact fluorescence thermometry and environmental monitoring.
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