Modulating the Ground- and Excited-State Oxidation Potentials of Diaminonaphthalene by Sequential N-Methylation
作者:Neil P. Campbell、Amethist S. Finch、Steven E. Rokita
DOI:10.1002/cphc.200900969
日期:2010.6.7
decrease in ground‐state oxidationpotential for derivatives containing monomethylamino substituents. In contrast, steric effects seem to dominate the increase in the ground‐state oxidationpotential of derivatives containing dimethylamino substituents since the conformational constraints created by dimethylation suppress delocalization of the nonbonding electrons. Absorption and emission properties also
Reductive Electron Injection into Duplex DNA by Aromatic Amines
作者:Takeo Ito、Steven E. Rokita
DOI:10.1021/ja045637n
日期:2004.12.1
attached TMDN strongly modulated charge transfer as evident by a 60-fold decrease in reduction of the distal (Br)U when the counterbase A was substituted for C. An inverse relationship between this reduction and quenching of TMDN fluorescence by the counterbase was also discovered and is consistent with a competitionbetween radical recombination and electron migration away from the initial site of its injection
开发了一种基于光诱导反应和随后裂解含有溴脱氧尿苷 ((Br)U) 残基和无碱基位点的双链体 DNA 的检测方法,用于筛选芳香胺通过还原电子供体启动电荷转移的能力。两个候选物 N,N,N',N'-四甲基-1,5-二氨基萘 (TMDN) 和 1,5-二氨基萘 (DAN) 表达了所需的活性,随后制备了寡脱氧核苷酸-TMDN 缀合物以鉴定其他影响电子注入和转移到 DNA 的效率的变量。该系统仅表现出对分子氧的轻度敏感性,但受到高浓度 2-巯基乙醇的强烈抑制。
Intramolecular Acid-Catalyzed Amide Isomerization in Aqueous Solution
作者:Christopher Cox、Thomas Lectka
DOI:10.1021/ol9901265
日期:1999.9.1
[reaction: see text] We report for the first time that stoichiometric and even catalytic quantities of weak acids in aqueoussolution can very efficiently catalyze amide isomerization in a carefully designed system in which a proton donor is situated so that intramolecular hydrogen bonding to the amide nitrogen is highly favored. Our results provide the first experimental verification that hydrogen