CAJ | 학술논문

采用元素分析、1H核磁共振谱(1H NMR)和电喷雾电离质谱研究了两个大环主体分子β-环糊精(β-CD)和18-冠-6(18C6),结果显示,二者通过简单地混合形成了计量比为1∶1的超分子包合物18C6-β-CD.基于二维核磁共振谱(ROESY)的分析,提出了分子问相互作用的可能位点:18C6更倾向于驻留的β-CD的小口端.用热重分析和气相色谱飞行时间质谱比较了包合作用前后热降解过程包括降解度和降解产物的差异性,研究表明,18C6的存在促使β-CD提前分解,同时,由于分子间相互作用,导致二者分解产物中大碎片的相对含量大幅减小.这些结果显示,一个柔性大环分子18C6和一个刚性大环分子β-CD之间通过分子组装可以形成超分子包合物.
채용원소분석、1H핵자공진보(1H NMR)화전분무전리질보연구료량개대배주체분자β-배호정(β-CD)화18-관-6(18C6),결과현시,이자통과간단지혼합형성료계량비위1∶1적초분자포합물18C6-β-CD.기우이유핵자공진보(ROESY)적분석,제출료분자문상호작용적가능위점:18C6경경향우주류적β-CD적소구단.용열중분석화기상색보비행시간질보비교료포합작용전후열강해과정포괄강해도화강해산물적차이성,연구표명,18C6적존재촉사β-CD제전분해,동시,유우분자간상호작용,도치이자분해산물중대쇄편적상대함량대폭감소.저사결과현시,일개유성대배분자18C6화일개강성대배분자β-CD지간통과분자조장가이형성초분자포합물.
The formation of a 1:1 supramolecular complex between β-cyclodextrin (β-CD) and 18-crown-6 (18C6) by simply mixing them was confirmed by elemental analysis, 1H nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectrometry. The probable interaction sites between these species were determined by two-dimensional rotating frame nuclear Overhauser effect spectroscopy (ROESY), which showed that 18C6 tended to be located on the narrow end of the cavity of β-CD. Also, the degradation process including the degree of degradation and the degradation products of the complex was carefully compared with those of β-CD and 18C6 through thermogravimetric analysis and gas chromatography coupled to time-of-flight mass spectrometry. The experimental data indicated that the presence of 18C6 resulted in an earlier degradation of β-CD. Furthermore, the relative abundance of larger fragments from the degradation process of the two components was reduced drastically because of an intermolecular interaction. These results strongly indicate that a supramolecular complex can be constructed using the flexible macrocyclic molecule 18C6 as a guest and the rigid macrocyclic molecule β-CD as the host via molecular assembly between them.