摘要
利用吸收、稳态和时间分辨荧光方法研究了苯腙（PD）和半花菁（DAEP）分子在Z型LB多层膜中的聚集体性质，苯腙和半花菁吸收光谱的红移和兰移，说明它们分别以J和H型聚集体形式存在于LB腹中苯腙和半花菁LB膜的荧光发射带分别在560nm和584nm处，亦分别对于它们溶液的荧光谱显示出红移和兰移的特征．它们的荧光衰减曲线能很好地用双指数模型拟合，在苯腙和半花菁LB多层膜中主要存在着荧光寿命分别在ns和10ps量级的两种组分（单体和二聚体）．
The aggregation behavior of phenylhydrazone (PD) and hemicyanine (DAEP),in Z-type LB multilayers has been studied by absorption, steady state and time-resolved fluorescence spectroscopies. The LB multilayers of pure PD and DAEP shotved J-and Haggregate formations, characterized by a large red-shift (398nm→440nm, △E-2398cm-1 )and blue-shift (510nm→465nm, △E- 1898cm-1 ), respectively. The main fluorescence emission bands were found to be at 560 nm and 584 nm for PD and DAEP multilayers. The fluorescence decny profiles of PD and DAEP in LB filins could be best-fitted by using a biexponential decay niodel. Our results reveal that there mainly exist two species (monomer and dimer) in the LB multilayers with characteristic fluorescence decay time in the order of ns and 10 ps, respectively.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1996年第5期413-417,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学重点基金
关键词
聚集体
时间分辨荧光
苯腙
半花菁
LB膜
Langmuir-Blodgett films, aggregation, time-resolved fluorescence, phenylhydrazone, hemicyanine
