Sensitization of Europium(III) Luminescence by Benzophenone-Containing Ligands: Regioisomers, Rearrangements and Chelate Ring Size, and Their Influence on Quantum Yields
作者:Andrew J. Wilkinson、Davide Maffeo、Andrew Beeby、Clive E. Foster、J. A. Gareth Williams
DOI:10.1021/ic701113c
日期:2007.10.1
these three isomeric complexes differ from one another in the substitution position of the BP unit, namely para, meta, and ortho for L1, L2, and L3 respectively. The quantum yields of europium luminescence sensitized via the chromophore are found to be highly dependent upon the position of substitution, being 20 times smaller for the ortho compared to the para-substituted complex. A related para-substituted
已研究了一系列基于大环氮杂羧酸酯结构DO3A的of(III)配合物,并通过含有酰胺键的连接基(H3DO3A = 1,4,7,10-四氮杂环十二烷-1,4)掺入了大环N10处的二苯甲酮。 ,7-三-乙酸)。配合物[EuL(1-3)]包含N10-CH2CONH-BP连接子(BP =二苯甲酮),在酰胺氧螯合后,可形成含金属离子的五元螯合环;这三种异构体在BP单元的取代位置上彼此不同,分别是L1,L2和L3的对位,间位和邻位。发现通过发色团敏化的lu发光的量子产率高度依赖于取代的位置,与对位取代的配合物相比,邻位的量子产率要小20倍。通过对氮杂大环与含BP的丙烯酰胺的不寻常的迈克尔反应制备的相关对位取代BP复合物[EuL(4)]在连接基中引入了一个额外的亚甲基单元,即N10-CH2CH2CONH-BP。尽管有更长的连接子,但该络合物等于[EuL(1)]所达到的发光量子产率(在298 K的H2O中,Phi(lum)分别为0