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Multielectron transfer at heme-functionalized nanocrystalline TiO2: Reductive dechlorination of DDT and CCl4 forms stable carbene compounds

机译:血红素官能化纳米晶TiO2上的多电子转移:DDT和CCl4的还原脱氯形成稳定的卡宾化合物

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摘要

Hemin (chloro(protoporhyrinato)iron(III)) was found to bind to mesoporous nanocrystalline (anatase) TiO2 thin films from dimethyl sulfoxide solution, K-eq = 10(5) M-1 at 298 K. Band gap illumination in methanol reduced hemin to heme and led to the appearance of TiO2 electrons, heme/TiO2(e(-)). Reactions of heme/TiO2(e(-)) with CCl4 or 1,1-bis(p-chlorophenyl)-2,2,2-trichloroethane (DDT) led to the formation of stable carbene products in greater than 60% yield. The spectroscopic data are fully consistent with a dissociative two-electron organohalide reduction mechanism of CCl4 and DDT to yield (protoporhyrinato) (FeCCl2)-C-II and (protoporhyrinato) (FeC)-C-II=C(p-Cl-phenyl)(2) respectively.
机译:已发现,在298 K下,二甲基亚砜溶液(K-eq = 10(5)M-1)的血红素(氯(原卟啉铁)(III))与中孔纳米晶(锐钛矿)TiO2薄膜结合。减少了甲醇中的带隙照明血红素形成血红素,并导致出现TiO2电子,即血红素/ TiO2(e(-))。血红素/ TiO2(e(-))与CCl4或1,1-双(对氯苯基)-2,2,2-三氯乙烷(DDT)的反应导致形成稳定的卡宾产物,收率超过60%。光谱数据与CCl4和DDT的离解性双电子有机卤化物还原机理完全一致,从而生成(原卟啉)(FeCCl2)-C-II和(原卟啉)(FeC)-C-II = C(对氯苯基) )(2)。

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