2,3-Anthraceno[2.2.2]cryptand. Mutual interactions between the receptor and the signal transducing subunit
作者:Jean-Pierre Desvergne、Nacer Lahrahar、Matthias Gotta、York Zimmermann、Henri Bouas-Laurent
DOI:10.1039/b501093b
日期:——
As a complement to the study of 9,10- and 1,4-anthracenocryptands, 2,3-anthraceno[2.2.2]cryptand (1) was synthesized in order to examine the mutual influence of the two components: the cation-binding subunit and the pendent aromatic moiety. It was shown that the receptor subunit induces small perturbations to the absorption spectrum and the fine structure fluorescence spectrum of 1 that are typical of those of 2,3-disubstituted anthracene reference molecules. Conversely, the stability constants towards metal cations (Ks), determined from the electronic spectra using the LETAGROP programme, were found to be altered by the incorporated aromatic component, namely lowered by several orders of magnitude compared with those of [2.2.2]cryptand. For instance, logKs values in CH3CN for 1 were found to be: K+(8); Tl+(10); for [2.2.2]cryptand: K+(11); Tl+(12). The observed decrease of binding ability can be attributed to a relative lack of flexibility of the receptor and some hindrance to cation solvation due to the aromatic component.
作为 9,10- 和 1,4- 蒽隐配体研究的补充,合成了 2,3-蒽[2.2.2] 隐配体 (1),以检查两种组分的相互影响: 阳离子结合亚基和悬挂的芳香部分。结果表明,受体亚基对 1 的吸收光谱和精细结构荧光光谱产生小扰动,这是 2,3-二取代蒽参考分子的典型特征。相反,使用 LETAGROP 程序根据电子光谱确定的金属阳离子 (Ks) 的稳定常数被发现因掺入的芳香族成分而改变,即与 [2.2.2]cryptand 相比降低了几个数量级。例如,CH3CN 中 1 的 logKs 值为:K+(8); Tl+(10);对于[2.2.2]密码子:K+(11); Tl+(12)。观察到的结合能力下降可归因于受体相对缺乏灵活性以及芳香族成分对阳离子溶剂化的一些阻碍。