Structural and Chiroptical Properties of Acyclic and Macrocyclic 1,5-Bis(oxazoline) Ligands and Their Copper(I) and Silver(I) Complexes
作者:Miklos Hollosi、Zsuzsa Majer、Elemér Vass、Zlata Raza、Vladislav Tomišić、Tomislav Portada、Ivo Piantanida、Mladen Žinić、Vitomir Šunjić
DOI:10.1002/1099-0682(200207)2002:7<1738::aid-ejic1738>3.0.co;2-o
日期:2002.7
Symmetric acyclic ligands 1a-1e, macrocyclic ligands 2a-2d and 3, and their copper(I) and silver(I) complexes were studied by UV, NMR and CD spectroscopy. The stability constants of the metal-1a and -1b complexes with 1:1 and 1:2 stoichiometries in acetonitrile were determined by spectrometric titrations. Evidence of tetrahedral coordination for complex [Ag(1a)2]+ was obtained from the complexation induced
通过UV、NMR和CD光谱研究了C2对称无环配体1a-1e、大环配体2a-2d和3以及它们的铜(I)和银(I)配合物。通过光谱滴定确定在乙腈中具有 1:1 和 1:2 化学计量的金属-1a 和 -1b 配合物的稳定性常数。复合物 [Ag(1a)2]+ 的四面体协调证据是从复合诱导位移 (CIS) 和 NOE 效应中获得的,并通过分子建模得到证实。在立体中心(1a、c 和 2)上具有苯环的配体在 1Bb 带区域表现出强烈的棉花效应(CE),而在立体中心(1b、3)上具有苄基的配体中不存在这种效应。这种效应归因于两个芳香族发色团在立体中心上的激子耦合 (EC)。