Liao Jen-Hai, Chen Chao-Tsen, Fang Jim-Min
Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China.
Org Lett. 2002 Feb 21;4(4):561-4. doi: 10.1021/ol0171564.
[structure: see text] The neutral receptor N,N'-bis[3,5-di[(1-pyrenylmethyl)carbamoyl]benzyl] pyridine-2,6-dicarbamide (2) provides a pseudo-tetrahedron cleft and multiple hydrogen bondings to form a 1:1 complex with phosphate ion in a highly selective manner, by comparison with other anions (F(-), Cl(-), Br(-), SCN(-), AcO(-), NO(3)(-), ClO(4)(-), and HSO(4)(-)). The binding strength can be inferred from the emission intensity ratio of the pyrene monomer (lambda(max) 377 nm) to the excimer (lambda(max) 477 nm). Fluorescence titration, X-ray analysis, and NMR studies support a proposed complexation model.
[结构：见正文] 中性受体N,N'-双[3,5-二[(1-芘甲基)氨基甲酰基]苄基]吡啶-2,6-二甲酰胺（2）提供了一个假四面体裂缝和多个氢键，以与磷酸根离子形成1:1的络合物，与其他阴离子（F(-)、Cl(-)、Br(-)、SCN(-)、AcO(-)、NO(3)(-)、ClO(4)(-)和HSO(4)(-)）相比具有高度选择性。结合强度可从芘单体（λmax 377 nm）与准分子（λmax 477 nm）的发射强度比推断出来。荧光滴定、X射线分析和核磁共振研究支持所提出的络合模型。
