β-環糊精與4'-N, N-二甲基氨基黃酮3-甲基丙稀酸酯的超分子相互作用：增強的lCT發射

Supramolecular Interaction of β-CD With 4'-N,N-Dimethylaminoflavone-3-methacrylate: Enhanced ICT State Emisson

10.6623/chem.1998032

晉衛軍(Wei-Jun Jin)；劉萬卉(Wan-Hui Liu)；沈國勵(Guo-Li Shen)；俞汝勤(Ru-Qin Yu)

分子內電荷轉移 ； 熒光 ； β-環糊精 ； 超分子化學 ； Intramolecular charge transfer ； fluorscence ； β-cyclodextrin ； supramolecular chemistry

化學

56卷4期（1998 / 12 / 01）

245 - 250

繁體中文

4'-N, N-二甲氧基黃酮-3-甲基丙烯酸酯(DMAFMA)是量子產率很高的獎光探針試劑。其分子內電荷轉移(lCT)熒光在水中由於不發光的扭曲的分子內電荷轉移態(TICT)的形成幾乎完全猝滅。但在β-CD存在下，通過超分子配合作用ICT獎光顯著增強，並且激發和發射波長發生藍移。擁有疏水微環境的β-CD不僅阻礙非輻射的TICT態的形成，而且有效地保護激發的ICT態。通過檢測ICT發光的變化測定了超分子相互作用的配合常數K_(cpI)、焓變和熵變。

4'-N, N-Dimethylaminoflavone-3-methacrylate is a new fluorescence probe with intramolecular charge transfer (lCT) behavior. Its ICT fluorescence is almost completely quenched in aqueous solu- tions because of the formation of nonradiative twisted ICT (TICT) states and is largely enhanced with the blue-shift of excitation and emission maxima by supramolecular interaction with β-cyclodextrin (β-CD). The β-CD cavity exhibiting hydrophobicity and lower polarity than water protects the excited ICT state and hinders the formation of nonradiative TICT state. The formation constant of complex and Δ H^0 and Δ S^0 of complexation were determined by monitoring ICT emission.