The Synthesis of Cucurbit[n] Uril and the Interaction between Cucurbit[n] Uril and Surfactant CTAB
|Course||Polymer Chemistry and Physics|
|Keywords||Glycoluril The gourd [ n ] urea Surface - active agent (CTAB) NMR Surface tension Conductivity The role of the envelope|
Gourd [n] urea (cucurbit [n] uril) is the second crown ether cyclodextrin and calixarene after high-profile of a new class of macrocyclic host molecule compounds. It is a gourd-shaped molecules of the macrocyclic cavity, open at both ends. This unique structure makes it through the intermolecular forces envelope and identify molecules and ions, has a great development prospects in the field of molecular assembly, catalysis, molecular recognition, medicine, sewage treatment simulation enzyme and drug oriented. In this paper, IR, nuclear magnetic resonance spectroscopy, surface tension, conductivity, and thermal gravimetric analysis means of a detailed study of the interaction between the the CUCURBITURIL surfactant, an increase of new host compounds in the molecular envelope and recognition more in-depth understanding and knowledge. As part of the National Natural Science Foundation of China (20703023), the main contents of this paper are as follows: Summary of the Chapter CUCURBITURIL series of compounds, the structural properties of the derivatives and related research progress. Chapter II, using the acid catalyzed method Synthesis glycoluril discussed the reaction conditions such as the molar ratio of urea / glyoxal, reaction time, pH value of synthetic glycoluril, and the glycoluril the structure NMR characterization. The third Chapter synthetic gourd [n] urea (n = 5,6,7), according to their solubility in different solvents its separation and structural characterization. The Chapter by surface tension, such as nuclear magnetic resonance, and thermal gravimetric analysis means CUCURBITURIL  cetyl trimethyl ammonium bromide (CTAB) micellar solution system behavior were investigated and intermolecular The behavior of the envelope. Calculate the critical micelle concentration of the system and the CTAB with CB  was formed envelope envelope measurement ratio and a constant envelope, the envelope stoichiometry and inclusion constants were 1:1 and 2.8 × 103L/mol . The results showed that the CB  CTAB micellization have a more significant impact, the addition of CB  delay CTAB micelle formation. Nuclear magnetic resonance, and thermal gravimetric analysis further proved that the main object of the behavior of the envelope and the envelope increases the thermal stability of the envelope. Chapter by surface tension and conductivity of the gourd [n] urea (n = 5,7) in the solution of cetyl trimethyl ammonium bromide micellar behavior were investigated and molecular envelope behavior. Calculate the system critical micelle concentration and CTAB CB  and CB  the formation of inclusion complexes envelope the stoichiometry and envelope constant CB  and CTAB envelope measurement ratio and inclusion constants, respectively 1: l 3.3 × 103L/mol, of CB  and CTAB envelope measurement ratio and the inclusion constant 1:1 and 2.5 × 103L/mol The results showed that the CB  and CB  have a more significant impact CTAB micellization of CB  and CB  delay CTAB micelle formation. cavity Cucurbituril of CTAB inclusion complexes are relatively more stable, more suitable envelope CTAB, CTAB selective better. Chapter 6 Conclusions and Prospects.