乙腈
化学
碘化物
超分子化学
离子
卤化物
过氧化氢
氯仿
无机化学
甲醇
盐(化学)
晶体结构
结晶学
物理化学
有机化学
作者
Ján Švec,Michal Dušek,Karla Fejfarová,Peter Štacko,Petr Klán,Ángel E. Kaifer,Wei Li,Edita Hudeckova,Vladimír Šindelář
标识
DOI:10.1002/chem.201003683
摘要
Methods for the preparation of anion-free bambus[6]uril (BU6) are presented. They are based on the oxidation of iodide anion, which is bound inside the macrocycle, utilizing dark oxidation by hydrogen peroxide or photooxidation in the presence of titanium dioxide. Anion-free BU6 was found to be insoluble in any of the investigated solvents; however, it dissolves in methanol/chloroform (1:1) or acetonitrile/water (1:1) mixtures in the presence of the tetrabutylammonium salt of a suitable anion. The association constants with halide ions, BF(4)(-), NO(3)(-), and CN(-), were measured by (1)H NMR spectroscopy. The highest association constant (8.9×10(5) M(-1)) was found for the 1:1 complex of BU6 with I(-) in acetonitrile/water mixture. A number of crystal structures of BU6 complexes with various anions were obtained. The influence of the anion size on the macrocycle diameter is discussed together with an unusual arrangement of the macrocycles into separate layers.
科研通智能强力驱动
Strongly Powered by AbleSci AI