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Enhanced singlet oxygen generation by hybrid Mn-doped nanocomposites for selective photo-oxidation of benzylic alcohols

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Abstract

Transition-metal ions doped nanocrystals (NCs), specifically Mn-doped NCs, hold great potential in the field of photocatalysis, especially, to improve photocatalytic performance for singlet oxygen (1O2) generation. Here, we report the design of a novel Mn-doped NC-based nanocomposites, specifically, silica-coated Mn-doped CdS/ZnS NCs decorated with Pt NCs (denoted as Mn-NCs@SiO2-Pt), which enhance photocatalytic 1O2 generation. Owing to the long-lived Mn excited state (on the order of ms), the energy-transfer between Mn-NCs and molecular oxygen is facilitated with the assistance of the Pt NCs adhered to the Mn-NC@SiO2 surface. Therefore, the Mn-NCs@SiO2-Pt composites, integrate the advantages of Mn-doped NCs, a protective silica layer, and Pt NCs to exhibit excellent catalytic activity and selectivity for the selective oxidation of primary benzylic alcohols to aldehydes through an 1O2 engaged oxidation process under visible-light irradiation. This work paves the way for enhancing catalytic performance via facilitated energy transfer relaxation by utilizing the long-lived excited-state of Mn2+ dopant ions in nanocomposites.

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Acknowledgements

W. Z. acknowledges the support from the start-up grant of Syracuse University, ACS-PRF (No. 59861-DNI5) and NSF CHE MSN (No. 05539CON04700). W. Z. appreciates the valuable discussion on the reaction mechanism with Prof. Timothy Korter.

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Authors and Affiliations

  1. Department of Chemistry, Syracuse University, Syracuse, NY, 13244, USA

    Zhi-Jun Li, Andrew Hunter Davis, Elan Hofman & Weiwei Zheng

  2. Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, NY, 13210, USA

    Shuya Li & Gyu Leem

  3. The Michael M. Szwarc Polymer Research Institute, Syracuse, NY, 13210, USA

    Gyu Leem

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  1. Zhi-Jun Li
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  2. Shuya Li
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Li, ZJ., Li, S., Davis, A.H. et al. Enhanced singlet oxygen generation by hybrid Mn-doped nanocomposites for selective photo-oxidation of benzylic alcohols. Nano Res. 13, 1668–1676 (2020). https://doi.org/10.1007/s12274-020-2790-0

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