Scholarlink

Abstract <p>The lithium salt of tetranuclear cobalt complex Li<sub>10</sub>[Co<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>(α-PW<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]·24H<sub>2</sub>O (<b>1</b>), an active homogeneous catalyst for the reaction of water oxidation with the formation of O<sub>2</sub>, has been synthesized and characterized by instrumental methods. Electrospray ionization (ESI) mass spectrometry showed the presence of the most abundant mass spectral peak at <i>m/z</i> 1182.611 due to the [Co<sub>4</sub>(PW<sub>9</sub>O<sub>34</sub>)<sub>2</sub>·HLi<sub>5</sub>]<sup>4–</sup> ion forming a sandwich-type structure. Measurements of temperature-dependent magnetic susceptibility showed the predominance of antiferromagnetic interaction in complex <b>1</b>. The photochemical oxidation reaction of water under irradiation with visible light was studied in the presence of Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub> as an electron scavenger, a bpy<sub>3</sub>RuCl<sub>2</sub> photosensitizer, and a catalyst. The efficiency of the catalytic system under optimal reaction conditions (pH 8, [<b>1</b>] = 5 μmol/L), the catalyst turnover number TON = 330 and the quantum yield of photogenerated oxygen (Ф = 0.46), were higher than those of the sodium salt of a similar catalyst (TON = 220, Ф&#xa0;=&#xa0;0.27).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Photochemical Oxidation of Water Catalyzed by a Tetranuclear Cobalt(II) Complex with Polyoxotungstophosphate Ligands and Lithium Countercations in Artificial Photosynthesis

  • 期刊论文

  • 发表日期：

    2025年2月1日

查看全文
  • Z. M. Dzhabieva,
  • V. Yu. Il’yashchenko,
  • T. A. Savinykh,
  • A. I. Dmitriev,
  • M. V. Zhidkov,
  • Yu. M. Baskakova,
  • T. S. Dzhabiev

摘要

Abstract

The lithium salt of tetranuclear cobalt complex Li10[Co4(H2O)2(α-PW9O34)2]·24H2O (1), an active homogeneous catalyst for the reaction of water oxidation with the formation of O2, has been synthesized and characterized by instrumental methods. Electrospray ionization (ESI) mass spectrometry showed the presence of the most abundant mass spectral peak at m/z 1182.611 due to the [Co4(PW9O34)2·HLi5]4– ion forming a sandwich-type structure. Measurements of temperature-dependent magnetic susceptibility showed the predominance of antiferromagnetic interaction in complex 1. The photochemical oxidation reaction of water under irradiation with visible light was studied in the presence of Na2S2O8 as an electron scavenger, a bpy3RuCl2 photosensitizer, and a catalyst. The efficiency of the catalytic system under optimal reaction conditions (pH 8, [1] = 5 μmol/L), the catalyst turnover number TON = 330 and the quantum yield of photogenerated oxygen (Ф = 0.46), were higher than those of the sodium salt of a similar catalyst (TON = 220, Ф = 0.27).