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Immobilizing Triphenylamine with Photoredox Inert Sr2+ Forming Sr-MOF with Controlled Electron Migration for Photocatalytic Oxidation of Thiols to Disulfides
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  • Ying-Xia Wang,
  • Fang Zheng,
  • Dong-Xia Song,
  • Bao-Yue Niu,
  • Lu-Qian Deng,
  • Xian-Ming Zhang
Ying-Xia Wang
Shanxi Normal University
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Fang Zheng
Shanxi Normal University
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Dong-Xia Song
Shanxi Normal University
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Bao-Yue Niu
Shanxi Normal University
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Lu-Qian Deng
Shanxi Normal University
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Xian-Ming Zhang
Shanxi Normal University

Corresponding Author:[email protected]

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Abstract

The photocatalytic oxidative coupling of thiols is one of the most popular methods to synthesis the disulfides. Triphenylamine and its derivatives (TPAs) are promising for the above reaction, but suffer from the easy polymerization and difficult separation. To overcome these obstacles while controlling the photogenerated electrons transfer directly to target substrates, herein, we constructed one TPA-based metal-organic framework (MOF), (Me2NH2)[Sr(TCPBA)]·2DMA·3H2O (1), by direct self-assembly of tris(4′-carboxybiphenyl)amine (H3TCPBA) and photoredox inert strontium ion (Sr2+). DFT calculations revealed that the valence band maximum (VBM) and the conduction band minimum (CBM) are mainly located on TCBPA3-, successfully inhibiting the undesirable electron migration to metal nodes. Experimental results indicated that 1 displays superior performance than homogeneous H3TCPBA, which may result from the abundant π···π and C-H···π interactions between the well-arranged TCBPA3- and the build-in electric field between the anionic framework and the Me2NH2+. This work highlights that immobilizing TPAs into MOFs is one promising approach to design heterogeneous photocatalysts for the synthesis of disulfides by oxidative coupling of thiols.