Catalytic Photooxidation of 4-Methoxybenzyl Alcohol with a Flavin-Zinc(<scp>II</scp>)-Cyclen Complex
作者:Radek Cibulka、Rudolf Vasold、Burkhard König
DOI:10.1002/chem.200400232
日期:2004.12.17
the flavin chromophore. This intramolecular process provides a much higher photooxidation efficiency, with quantum yields 30 times those of the comparable intermolecular process with a flavin chromophore without a binding site. For the reaction in buffered aqueous solution a quantum yield of Phi = 0.4 is observed. The turnover number in acetonitrile is increased (up to 20) by high benzylalcohol concentrations
Design, Synthesis, and Evaluation of a Biomimetic Artificial Photolyase Model
作者:Olaf Wiest、Christopher B. Harrison、Nicolas J. Saettel、Radek Cibulka、Mirjam Sax、Burkhard König
DOI:10.1021/jo0494329
日期:2004.11.1
photolyase models that recognize pyrimidine dimers in protic and aprotic organicsolvents as well as in water through a combination of charge and hydrogen-bonding interactions and use a mimic of the flavine to achieve repair through reductive photoinduced electron transfer are presented. Fluorescence and NMR titration studies show that it forms a 1:1 complex with pyrimidine dimers with binding constants
提出了两种新的人工光解酶模型,它们通过结合电荷和氢键相互作用识别质子和非质子有机溶剂以及水中的嘧啶二聚体,并利用黄酮的模拟物通过还原性光诱导的电子转移实现修复。荧光和NMR滴定研究表明,它与嘧啶二聚体形成1:1的络合物,结合常数约为10 3 M - 1在乙腈或甲醇中时,在pH 7.2的水中的结合常数略低。用可见光激发该络合物通过光诱导的电子转移催化导致嘧啶二聚体的清洁和快速环还原。在水中的反应明显快于在有机溶剂中的反应。由于产物抑制,反应在较高转化率下减慢。