摘要
在外部重原子微拢剂溴代环己烷存在下，β－ＣＤ／碘代乙基联苯体系可发射一定强度的室温磷光信号，若丁醇作为第四组分存在，则能显著提高体系的室温磷光发射强度。研究了该体系室温磷光发射的适宜条件和多种醇、不同环糊精及其衍生物的影响。认为β－ＣＤ／碘代乙基联苯／溴代环己烷／丁醇体系属于一种超分子组合的发光体系，醇的作用属典型的分子调控作用。β－ＣＤ／碘代乙基联苯／溴代环己烷形成主、客三元包结物，而醇则利用其羟基与ＣＤ端口羟基形成氢键，其烷基键借助于疏水相互作用力，覆盖在ＣＤ上、下端口，对外部氧向ＣＤ腔内的扩散起着隔离作用，减少了三线态氧对发光体激发三线态的猝灭。
Е? cyclodextrin(β CD)can induce 4 iodo 4' ethyl biphenyl(IEBP)to emit room temperature phosphorescence(RTP)in the presence of bromocyclohexane(BCH).If butyl alcohol(BuOH)is presented as a fourth component at the same time,RTP intensity of the system is enhanced obviously.Effects of different alcohols,CDs and derivatives of β CD on RTP emission of the system are studied.The results show that a ternary host guest inclusion complex is formed among β CD,IEBP and BCH,but the alcohol hydroxyl bonds to the rim of the CD cavities by hydrogen bonding and the alkyl end of alcohol flips over the two tops of the CD due to hydrophobic interaction force.Accordingly,the alcohol acts as a lid for CD cup,thereby shielding IEBP from oxygen and decreasing the collision quenching of oxygen,and decreasing the micro polarity of the CD cavity and the formation constant of ternary inclusion complex increases.As a result,the RTP of the system is enhanced.As far as we can see that the system studied is a typical supramolecular assembly one and the BuOH acts as a molecular regulation for RTP emitting.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1998年第5期617-621,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
关键词
室温磷光
环糊精
碘代乙基联苯
溴代环己烷
醇
Supramolecular assembly room temperature phosphorescence
Cyclodextrin
4 iodo 4' ethyl biphenyl
Bromocyclohexane
Alcohol
