十六烷基三甲基溴化铵在葫芦[6]脲水溶液中的胶束化行为及分子间包络行为

Micellization and molecular envelope behavior of cetyltriethylammonium bromide in cucurbit[6]uril Aqueous Solution

通过表面张力、核磁共振以及热重分析等手段研究了葫芦脲[6]对十六烷基三甲基溴化铵(CTAB)在水溶液体系中胶束化行为的影响规律及分子间包络行为。计算了体系的临界胶束浓度及CTAB与CB[6]形成的包络物的包络计量比和包络常数,其包络计量比和包结常数分别为1:1和2.8×103L/mol。结果表明,CB[6]对CTAB的胶束化有较显著的影响,CB[6]的加入延迟了CTAB胶束的生成。核磁共振及热重分析进一步证明了主客体的包络行为及包络增加了包络物的热稳定性。

Surface tension, 1 HNMR and Thermogravimetric Analysis were performed to exam the micelliza tion behavior of cucurbitF6]uril （CB [6]） and cetyltriethylammonium bromide in sodium chloride solution. The apparent critical micelle concentrations,the stoichoimetry and the equilibrium constants for the inclu sion compounds of CTAB with CB [6]were determined. The influence of CB I-6] and its complex on the mi cellization process of CTAB was also analyzed. The results indicate that the addition of CB[6] inflicted pronounced impact upon micellization of CTAB, retarding the formation of CTAB micelles;in addition,CBE6] was found to form inclusion compounds with CTAB with the stoichoimetry of 1 ： 1 and the equilibrium constants of 2.8 X 103 L/tool. 1HNMR spectroscopy and Thermogravimetric Analysis study further evidenced the inclusion behavior and the increase of the thermal stability of CTAB was due to the host-guest complexation.