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Photophysical and photochemical processes of several aramatic molecules

几种芳族化合物分子的光物理和光化学过程

基本信息

批准号：
09640599
负责人：
HIKIDA Takumi
金额：
$ 2.24万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640599/
关键词：
supercritical fluid aromatic molecule phosphorescence guantum field lifetime excimer dimer 超臨界流体りん光寿命

项目摘要

Photophysical and photochemical processes of several aromatic molecules were studied in supercritical fluids by means of time-resolved and steady- state measurements.The emission intensity decay curve of pyrene in the CO_2 supercritical fluid showed a 12 ns rise and a 100 ns decay. The former is that of the excimer lifetime, while the later is the lifetime of excited pyrene. The monomer fluorescence intensity was proportional to the concentrations of pyrene while that of excimer emission was nearly constant regardless of the concentrations.Absorption spectra of tetracene in the CO_2 supercritical fluid showed a new absorption band at around 525 nm which was assigned to that of the ground state dimer. The emission intensity decay measured at 550 nm were analyzed in terms of biexponential function, 12 ns and 22 ns. The lifetime of 12-13 ns is those of monomer and 22 ns is the dimer lifetime.The emission spectra of Cl-naphthalene in the CO_2 supercritical fluid consisted of the weak phosphorescence emission at around 430-600 nm as well as the ordinary monomer fluorescence appearing at around 300-400 nm. The fluorescence quantum yield was about 0.5 while that of the phosphorescence was about 10^<-5>. The emission intensity decay measured at 350 nm was 5 ns, while that measured at 500 nm was about 100 ns.

用时间分辨和稳态测量的方法研究了几种芳香族分子在超临界流体中的光物理和光化学过程。在超临界CO2流体中，芘的发光强度衰减曲线表现为12 ns上升和100 ns衰减。前者是激基缔合物的寿命，后者是激发的芘的寿命。在CO_2超临界流体中，四苯的吸收光谱在525 nm附近有一个新的吸收峰，该吸收峰归属于基态二聚体的吸收峰。用12 ns和22 ns的双指数函数分析了在550 nm处测得的发射强度衰减。在CO_2超临界流体中，氯-萘的发射光谱由430-600 nm的微弱磷光发射和300-400 nm的普通单体荧光组成。荧光量子产率约为0.5，而磷光量子产率约为10^~(-5)&gt；在350 nm处测得的发射强度衰减为5 ns，而在500 nm处测得的发射强度衰减约为100 ns。