CAJ | 학술논문

利用紫外吸收光谱法、荧光光谱法、等温量热滴定法、氢核磁共振技术等研究了八元瓜环（Q [8]）与富电子客体吲哚乙酸（IAA）及缺电子客体甲基紫精（MV2＋）在水溶液中的超分子相互作用，探讨了主客体作用体系的作用机制，作用位点，作用模式及热力学等性质。紫外吸收光谱及荧光发射光谱研究结果表明Q [8]与IAA及Q[8]与MV2＋在水溶液中均形成了包结计量比为1∶1的主客体配合物，等温量热滴定法研究结果显示Q[8]／IAA及Q[8]／MV2＋体系的ΔH＜0，ΔG＜0，表明上述超分子体系是发进行且是放热反应。当在Q[8]／IAA二元体系中加入MV2＋时，MV2＋能与Q[8]／IAA体系在水溶液中形成1∶1∶1型三元主客体配合物，IAA的吲哚环及亚甲基部位受到了瓜环的屏蔽作用进入了Q[8]的空腔，MV2＋吡啶环部位也进入Q[8]的空腔，也即IAA及MV2＋均相互协同进入Q[8]空腔而与Q[8]形成了主客体配合物，原因可能是由于富电子客体IA A与缺电子客体M V2＋之间的电荷相互转移诱导作用引起的。上述研究结果为瓜环在富电子客体及缺电子客体超分子自组装方面的应用提供了一定的理论依据。
이용자외흡수광보법、형광광보법、등온량열적정법、경핵자공진기술등연구료팔원과배（Q [8]）여부전자객체신타을산（IAA）급결전자객체갑기자정（MV2＋）재수용액중적초분자상호작용，탐토료주객체작용체계적작용궤제，작용위점，작용모식급열역학등성질。자외흡수광보급형광발사광보연구결과표명Q [8]여IAA급Q[8]여MV2＋재수용액중균형성료포결계량비위1∶1적주객체배합물，등온량열적정법연구결과현시Q[8]／IAA급Q[8]／MV2＋체계적ΔH＜0，ΔG＜0，표명상술초분자체계시발진행차시방열반응。당재Q[8]／IAA이원체계중가입MV2＋시，MV2＋능여Q[8]／IAA체계재수용액중형성1∶1∶1형삼원주객체배합물，IAA적신타배급아갑기부위수도료과배적병폐작용진입료Q[8]적공강，MV2＋필정배부위야진입Q[8]적공강，야즉IAA급MV2＋균상호협동진입Q[8]공강이여Q[8]형성료주객체배합물，원인가능시유우부전자객체IA A여결전자객체M V2＋지간적전하상호전이유도작용인기적。상술연구결과위과배재부전자객체급결전자객체초분자자조장방면적응용제공료일정적이론의거。
The interaction between Q[8] withβ‐indoleacetic acid and the methylviologen was studied in aqueous solution with e‐lectronic absorption spectroscopy (UV‐Vis) ,fluorescence spectroscopy ,1 H NMR spectroscopy and isothermal titration calorim‐etry (ITC) in details .The authors explored the mode of action ,action site and thermodynamic properties of the host‐guest sys‐tem .The electronic absorption and fluorescence spectroscopy data showed that the Q[8]/IAA system and Q[8]/MV2+ system informed 1∶1 inclusion complexes in aqueous solution .ITC results showed that the changes of Gibbs free energy and enthalpy are all negative ,it suggested that complex formation was spontaneous and exothermic reaction .Moreover ,ITC results for the Q [8] and IAA with MV2+ indicate that the association constants of the Q[8]‐IAA and Q[8]‐MV2+ complexes were (3.22 ± 0.96) × 105 L?mol-1 and (3.90 ± 0.91)× 106 L?mol-1 ,respectively .Therefore ,the interaction between Q[8] and IAA with the MV2+ was a competitive process .This likely occurs because the MV2+ and IAA molecules attempt to occupy the Q[8] cavity , which reduces the fluorescence and absorption spectra intensity of Q[8]‐IAA because of the formation of a new inclusion complex between Q[8] and IAA with MV2+ .In addition ,with the addition of MV2+ to a Q[8]/IAA complex ,1 H NMR results showed that the indole moieties of β‐indoleacetic acid and bipyridyl group of methylviologen can be incorporated into Q [8] cavities be‐cause of electronic transfer MV2+ with PQ in a Q[8] cavity with ternary complexes .These results provides the potential applica‐tions for the supramolecular self‐assembly in cucurbit[n]urils field .