Stable mixed-valent radicals from platinum(II) complexes of a bis(dioxolene) ligand.

Stable mixed-valent radicals from platinum(II) complexes of a bis(dioxolene) ligand.
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DOI:
10.1002/chem.201304848
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发表时间:
2014-05-19
影响因子:
4.3
通讯作者:
Halcrow, Malcolm A.
Halcrow, Malcolm A.
中科院分区:
化学2区
文献类型:
--
作者:
Loughrey, Jonathan J.;Sproules, Stephen;McInnes, Eric J. L.;Hardie, Michaele J.;Halcrow, Malcolm A.

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已用二膦或联吡啶“L”辅助配体制备了三种二铂(II)配合物[{PtL}2(μ-thea)](H4thea=2,3,6,7-四羟基-9,10-二甲基-9,10-二氢-9,10-乙醇蒽)。这些配合物的单电子氧化产生含有混合价[thea]3−配体的自由基阳离子,该配体具有离散的儿茶酚酸酯和半醌酸酯中心,并由四级亚甲基间隔基分隔开。这些自由基的电子特征接近由 UV/Vis/NIR 和 EPR 光谱确定的 Robin–Day II/III 类边界。晶体结构测定和 DFT 计算表明 thea4− 配体的氧化可能导致二氧杂环戊烯 π 系统之间的空间相互作用增加。
Three diplatinum(II) complexes [{PtL}2(μ-thea)] (H4thea=2,3,6,7-tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene) have been prepared, with diphosphine or bipyridyl “L” co-ligands. One-electron oxidation of these complexes gave radical cations containing a mixed-valent [thea]3− ligand with discrete catecholate and semiquinonate centers separated by quaternary methylene spacers. The electronic character of these radicals is near the Robin–Day class II/III border determined by UV/Vis/NIR and EPR spectroscopies. Crystal-structure determinations and a DFT calculation imply that oxidation of the thea4− ligand may lead to an increased through-space interaction between the dioxolene π systems.
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