A Simple Chemical Tuning of the Effective Concentration: Selection of Single-, Double-, and Triple-Stranded Binuclear Lanthanide Helicates
作者:Emmanuel Terazzi、Laure Guénée、Bernard Bocquet、Jean-François Lemonnier、Natalia Dalla Favera、Claude Piguet
DOI:10.1002/chem.200902026
日期:2009.11.23
[Ln2(L12 b‐2 H)n] (n=2, 3) complexes is further abruptly modulated along the lanthanide series (Ln=La to Lu), which provides an unprecedented tool for 1) tuning the number of ligand strands in the final helicates, 2) selectively coordinating lanthanides in the various complexes, and 3) controlling the ratio of lanthanide‐containing polymers over discrete assemblies.
更换终端2-苯并咪唑-6-羧基吡啶(两个内部旋转自由度)与2-苯并咪唑-8-羟基喹啉(一个内部的旋转自由度)到节段性双-三齿配体在从去L2和[ L3 -2 H] 2−至[ L12 b -2 H] 2−不会显着影响所得双核镧系三链螺旋络合物[Ln 2(L2)3 ] 6+,[Ln 2(L3-2 H)3 ]和[Ln 2(L12 b -2 H)3](回文螺旋,金属间接触距离≈9Å,螺旋间距≈1.4nm /圈)。但是,它们的热力学组装在溶液中完全不同,这可以通过[ L12 b -2 H] 2−的有效浓度急剧下降两个数量级来证明。[Ln 2(L12 b -2 H)n ](n = 2,3)络合物中的这个关键参数进一步沿着镧系元素序列(Ln = La到Lu)突然调制,这为1)调谐提供了前所未有的工具最终螺旋结构中配体链的数量; 2)选择性配位各种络合物中的镧系元素; 3)控制含镧系元素的聚合物与离散组装体的比例。