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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A fluorescent bis(benzoxazole) ligand: Toward binuclear Zn(II)-Zn(ii) assembly
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A fluorescent bis(benzoxazole) ligand: Toward binuclear Zn(II)-Zn(ii) assembly

机译:荧光双(苯并恶唑)配体:向双核Zn(II)-Zn(ii)组装

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摘要

A bis(benzoxazole) ligand (HL) has been synthesized, and its reaction with Zn(OAc)_2 has led to fluorescent complexes via formation of binuclear Zn(II)-Zn(ii) cores. The ligand-to-metal ratio of the complexes varies from 1:1 to 2:1, depending on the reaction conditions. A large binding constant K = 8.3 × 10~(20) [M~(-3)] has been determined for the reaction L + Zn~(2+)→L_2:Zn_2~(2+). The result indicates that the bis(benzoxazole) ligand is a useful building block to construct a binuclear core. On the basis of X-ray analysis, the binuclear Zn(ii)-Zn(ii) distance in the complexes is determined to be ~3.22 ?, which is quite comparable to that found in the enzymes (3.3 ?). Absorption and fluorescence study shows that a subtle chemical environmental change within the binuclear core can induce a large optical response.
机译:已经合成了双(苯并恶唑)配体(HL),其与Zn(OAc)_2的反应通过形成双核Zn(II)-Zn(ii)核导致了荧光络合物。配合物的金属与配体的比例在1:1至2:1之间变化,具体取决于反应条件。对于反应L + Zn〜(2+)→L_2:Zn_2〜(2+),已确定大的结合常数K = 8.3×10〜(20)[M〜(-3)]。结果表明,双(苯并恶唑)配体是构建双核核心的有用构件。根据X射线分析,确定配合物中双核Zn(ii)-Zn(ii)的距离为〜3.22 ?,与酶(3.3?)相当。吸收和荧光研究表明,双核核内的细微化学环境变化可引起较大的光学响应。

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