Sessler Jonathan L, Kim Sung Kuk, Gross Dustin E, Lee Chang-Hee, Kim Jong Seung, Lynch Vincent M
Department of Chemistry and Biochemistry, 1 University Station-A5300, The University of Texas at Austin, Austin, Texas 78712-0165, USA.
J Am Chem Soc. 2008 Oct 1;130(39):13162-6. doi: 10.1021/ja804976f. Epub 2008 Sep 6.
An ion-pair receptor, 1, containing both cation- and anion-recognizing sites, has been synthesized and characterized. Single-crystal X-ray diffraction structural studies and (1)H NMR spectroscopic analyses confirmed that 1 forms stable 1:1 complexes with CsF in solution and in the solid state in spite of the large separation enforced between the receptor-bound anion and cation. In 9:1 CDCl3/CD3OD, binding of fluoride anion within the calix[4]pyrrole core of 1 was not observed in the absence of a cobound cesium cation; however, it was seen in this solvent mixture under conditions where a Cs(+) cation was bound to the crown ether-strapped calix[4]arene subunit.
已合成并表征了一种同时含有阳离子和阴离子识别位点的离子对受体1。单晶X射线衍射结构研究和¹H NMR光谱分析证实,尽管受体结合的阴离子和阳离子之间存在较大间距,但1在溶液和固态中均能与CsF形成稳定的1:1配合物。在9:1的CDCl₃/CD₃OD中,在没有共结合铯阳离子的情况下,未观察到氟阴离子在1的杯[4]吡咯核心内的结合;然而,在Cs⁺阳离子与冠醚连接的杯[4]芳烃亚基结合的条件下,在这种溶剂混合物中观察到了这种结合。