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Characterization of the Elusive Rhodizonate Ring-Contraction Decarbonylation C_5O_4(OH)CO_2Me~(2-) Intermediate to Croconate

机译:难以确定的对重氮酸盐的难以捉摸的重氮唑烷环缩羰基C_5O_4(OH)CO_2Me〜(2-)

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摘要

Redox-active ligands and the related transition-metal complexes have attracted significant interest, especially for the exploitation of new functional room-temperature/airstable magnetic materials.~([1]) A redox study of the binuclear chloranilate, CA~(2-), [(TPyA)CoCA~(2-)Co(TPyA)]~(n+) (n = 2; TPyA = tris(2-pyridylmethyl)amine) complex, led to the reduction of a reduced, CA~(3-), upon oxidation of the dinuclear complex to n = 3.~([2,3,4]) Redox-induced electron transfer (RIET), in which a one-electron oxidation leads to a one-electron reduction, was also observed for the 2,5-ditert-butyl-3,6-dihydroxy-l,4-benzoquinonate (BDQ)~([5]) and 2,3,5,6-tetrahydroxy-l,4-benzo-quinonate~([6]) analogues. Hence, multielectron transfer occurs, such that [(TPyA)Co~(II)CA~(2-)Co~(II)(TPyA)]~(2+) undergoes two one-electron oxidations, and a one-electron reduction to form [(TPyA)Co~(III)-CA·(3-)Co~(III)(TPyA)]~(3+). RIET may contribute to more complex multielectron transfer reactions of contemporary importance, for example, nitrogen fixation, photosynthesis, water splitting, and CO_2 reduction.
机译:氧化还原活性配体和相关的过渡金属络合物引起了人们的极大兴趣,特别是对于开发新型的功能性室温/空气稳定的磁性材料。〜([1])对双核氯苯甲酸酯,CA〜(2- ),[(TPyA)CoCA〜(2-)Co(TPyA)]〜(n +)(n = 2; TPyA =三(2-吡啶基甲基)胺)络合物导致还原的CA〜(3 -),将双核络合物氧化为n = 3.〜([2,3,4])氧化还原诱导的电子转移(RIET),其中单电子氧化导致单电子还原。观察到3,6-二羟基-1,4-二羟基-1,4-苯并喹啉酸酯(BDQ)〜([5])和2,3,5,6-四羟基-1,4-苯并喹啉酸酯〜 ([6])类似物。因此,发生多电子转移,使得[(TPyA)Co〜(II)CA〜(2-)Co〜(II)(TPyA)]〜(2+)经历两次单电子氧化和一次电子还原形成[(TPyA)Co〜(III)-CA·(3-)Co〜(III)(TPyA)]〜(3+)。 RIET可能有助于更复杂的当代电子转移反应,例如固氮,光合作用,水分解和CO_2还原。

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