The Influence of the Amide Linkage in the Fe<sup>III</sup>-Binding Properties of Catechol-Modified Rosamine Derivatives
作者:Carla Queirós、Andreia Leite、Maria G. M. Couto、Luís Cunha-Silva、Giampaolo Barone、Baltazar de Castro、Maria Rangel、André M. N. Silva、Ana M. G. Silva
DOI:10.1002/chem.201502093
日期:2015.10.26
rosamine platforms through an amide linkage and were synthesized by using microwave‐assisted coupling reactions of carboxyl‐ or amine‐substituted rosamines with the corresponding catechol units and subsequent deprotection. RosCat1 possesses a reverse amide, whereas RosCat2 has the usual oriented amide bond (HNCO vs. CONH, respectively). The ligands were characterized by means of NMR spectroscopy, mass‐spectrometry
两种新的荧光配体RosCat1和RosCat2包含通过酰胺键连接至rosamine平台的邻苯二酚受体,并通过微波辅助的羧基或胺取代的rosamines与相应的邻苯二酚单元的偶合反应并随后脱保护而合成。RosCat1具有反向酰胺,而RosCat2具有通常的定向酰胺键(分别为HNCO与CONH)。通过NMR光谱,质谱,DFT计算和RosCat1的X射线晶体学研究对配体进行了表征。在不同的溶剂中评估了酰胺键对荧光配体的光物理性质的影响,结果表明RosCat1的荧光量子产率更高。这些配体与Fe III中心的配位化学已经通过质谱分析和半经验计算得到了合理化。通过螯合三个RosCat1或RosCat2配体获得八面体Fe III复合物。有趣的是,RosCat1中非常规的酰胺连接性通过“水杨酸酯型”配位模式在螯合物上形成了一个八元环。