摘要
合成、鉴定了具有离子识别功能的题示光敏离子载体（６，７－二甲氧基－４－亚甲基香豆素基）单氮杂－１８－冠－６ （ＤＭＣ－ＭＡＣ（Ｏ５）），研究了它在水中的吸收和荧光光谱，基于不同ｐＨ值水溶液中荧光光谱的变化，计算得该试剂激发态分子的酸性常数ｐＫａ＝ ６．００。基于在不同溶剂中荧光光谱的变化，由Ｓｏｌｖａｃｈｒｏｍ ｉｃ法，利用Ｌｉｐｐｅｒｔ方程并借助Ａｌｃｈｅｍ ｙ ２０００量化计算软件，采用分子力学模型（ＭＭ３），估算得该分子的基态和激发态偶极矩，分别为２．７５Ｄ和７．８４Ｄ。ＤＭＣ－ＭＡＣ（Ｏ５）保留了６，７－二甲氧基香豆素（ＤＭＣ）优良的发光性能，为其离子识别功能的研究奠定了良好的基础。
The reagent 6,7 dimethoxy 4 methene coumarin monoaza 18 crown 6 (DMC MAC(O 5)) whose function as an ionic recognition was synthesized and characterized. Its acidic dissociation constant at excited state was determined based on the changes of the fluorescence spectra in water. According to the Stokes shift of fluorescence spectra in different solvents,the dipole moments of ground state and excited state were estimated based on the molecular mechanics model using Alchemy 2000 software and Solvachromic method using the Lippert equation. It′s values are 2 75D and 7 84D, respectively.
出处
《分析试验室》
CAS
CSCD
1999年第6期5-9,共5页
Chinese Journal of Analysis Laboratory
基金
国家自然科学基金
关键词
光谱性质
酸性常数
偶极柜
冠醚
离子识别
dimethoxy 4 methene coumarin monoaza 18 crown 6 (DMC MAC(O5 ))
synthesis
spectroscopic property
acid dissociation constant
dipole moment
