Iron(iii) complexes of fluorescent hydroxamate ligands: preparation, properties, and cellular processing
作者:Antonia J. Clarke、Natsuho Yamamoto、Paul Jensen、Trevor W. Hambley
DOI:10.1039/b914368h
日期:——
fluorescence occurring over a two hr period. The rapid fluorescence return indicates that the complexes undergo ligand release, either via reduction followed by aquation, or via direct ligand exchange with the reductants. Electrochemical studies demonstrated that both complexes have very negative reduction potentials. Furthermore, [Fe(c343haH)(salen)] was shown to exhibit quasi-reversibility of reduction
研究了含异羟肟酸荧光团的铁(III)配合物作为体外缺氧选择性前药的模型。合成了两个配合物,[Fe(c343haH)(3)]和[Fe(salen)(c343haH)]。异羟肟酸香豆素荧光团的荧光几乎完全与[Fe(c343haH)(3)]中的铁(III)中心猝灭。但是,在水性介质中对[Fe(c343haH)(salen)]的淬灭作用极小,我们建议荧光是由于铁-salen结构中的固有应变而发生的结构重排导致的。还在细胞还原剂抗坏血酸和半胱氨酸存在下测量了荧光。荧光强度随时间增加,在两个小时内出现最快速的荧光返回。快速的荧光返回表明复合物经历了配体释放,要么通过还原然后水合,要么通过与还原剂的直接配体交换。电化学研究表明,两种配合物均具有非常负的还原电位。此外,[Fe(c343haH)(salen)]显示出还原的准可逆性。在A2780细胞中监测游离异羟肟酸酯配体和复合物的分布。随时间变化,游离配体