Selective Complexation in Three Component Cocrystals Composed of Pyrogallol[4]arene and Fluorescent Probes Pyrene and 1-(2-Pyridylazo)-2-naphthol
作者:Constance R. Pfeiffer、Drew A. Fowler、Jerry L. Atwood
DOI:10.1021/acs.cgd.5b00609
日期:2015.8.5
Cocrystals composed of a pyrogallol[4]arene molecule (one of C-propylpyrogallol[4]arene in ethanol and one of C-hexylpyrogallol[4]arene in isopropanol) and a pyrene molecule were crystallized and investigated with the aim to develop trends based on solvent and aliphatic tail length of the pyrogallol[4]arene. These new trends along with previously determined trends for the fluorescent probe 1-(2-pyridylazo)-2-naphthol (PAN), were then used to crystallize a cocrystal composed of C-hexylpyrogallol[4]arene and two fluorescent probes, pyrene and PAN. Within a two-component cocrystal of pyrene or PAN, the probe molecules are complexed in both the endo (inside the pyrogallol[4]arene bowl) and exo (outside the pyrogallol[4]arene bowl) positions. However, in the three component system, selective complexation of the probes is demonstrated whereby the PAN molecules prefer to be endo and the pyrene molecules occupy exo positions.
由一个羟基香豆素[4]烯分子(在乙醇中的C-丙基羟基香豆素[4]烯和在异丙醇中的C-己基羟基香豆素[4]烯)与一个芘分子组成的共晶体被结晶并研究,目的是基于羟基香豆素[4]烯的溶剂和脂肪链长度发展趋势。这些新的趋势连同先前为荧光探针1-(2-吡啶基氮)-2-萘醇(PAN)确定的趋势一起,用于结晶由C-己基羟基香豆素[4]烯和两个荧光探针(芘和PAN)组成的共晶体。在由芘或PAN组成的双组分共晶体中,探针分子在内(羟基香豆素[4]烯碗内)和外(羟基香豆素[4]烯碗外)位置均被配位。然而,在三组分体系中,显示了探针的选择性配位,其中PAN分子更倾向于处于内位置,而芘分子则占据外位置。