Method for photocatalytic cyclization reaction using core-shell quantum dots as triplet sensitizer

By using ZnSe@ZnS core-shell quantum dots as triplet sensitizers, the toxicity problem of heavy metal quantum dots was solved, achieving a highly efficient and low-toxicity organic reaction with significantly improved fluorescence quenching efficiency and reaction yield.

CN117924007BActive Publication Date: 2026-07-24DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2022-10-14
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing blue quantum dot photosensitizers often contain heavy metals, leading to toxicity issues and limiting their application in organic catalytic reactions.

Method used

ZnSe@ZnS core-shell quantum dots were used as triplet state sensitizers to chelate 4-biphenylcarboxylic acid molecules on the surface. The Pasternò–Büchi or styrene cycloaddition organic reaction was carried out by excitation with 400-420nm visible light. The photocatalytic cyclization reaction was carried out by using ZnSe@ZnS core-shell quantum dots as sensitizers.

Benefits of technology

It achieves a highly efficient and low-toxicity organic reaction with a fluorescence quenching efficiency of over 89% and a reaction yield of 68%, thus solving the toxicity problem of heavy metal quantum dots.

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Abstract

The application relates to a method for synthesizing organic compounds by visible light catalysis based on low-toxicity ZnSe@ZnS core-shell quantum dots. ZnSe@ZnS quantum dots are used as a sensitizer, the surface of the quantum dots is chelated with 4-biphenylcarboxylic acid (BIP) molecules, and an organic molecule to be reacted is added to the solution to construct a quantum dot sensitized energy transfer cycloaddition system. The photocatalytic energy transfer cycloaddition product can be obtained under 405nm visible light excitation. In the system, the energy transfer and transmission process is studied through a transient absorption spectrum.
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