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Study of Microscopic Molecular Environment Through which the Natural Radiative Lifetime is Determined

确定自然辐射寿命的微观分子环境研究

基本信息

批准号：
01470010
负责人：
HIRAYAMA Satoshi
金额：
$ 3.46万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

In order to understand the nature of microscopic molecular environments through which radiative lifetime of organic molecules are determined, the fluorescence lifetimes of a number of anthracene derivatives were measured in a wide variety of specially designed systems. The obtained results are summarized as follows.1. The radiative lifetime is determined for several anthracene derivatives both in supersonic free jets (gas phase) and in solution. The values in the two phases can be related through the refractive index of the solvents used as n^2zeta_f (solution) =zeta_f (gas phase)2. The relation established through a comparison of the radiative lifetimes in the two phases was further examined in solution. The refractive index of the solvent was varied by the application of hydrostatic pressure. For five anthracene derivatives, whose fluorescence quantum yields are practically equal to unity, n^2-relationship was found to be followed excellently over the range of pressure from 0.1 MPa to 400 MPa except for 9, 10-dimethoxyanthracene.3. Microscopic molecular environment created around a central molecule is dependent on the shape of the molecule in the center. This may lead to a n-dependence different from n^2-dependence. To confirm this, the effect of pressure on the fluorescence lifetimes of POPOP, QUI, BBQ and Bis-MSB, all of which are of a long-chain shape. In addition, the fluorescence-lifetime measurements were performed in the rare-gas matrixes or in droplets in order to obtain basic data which are necessary to expand the present study.

为了了解确定有机分子辐射寿命的微观分子环境的性质，在各种专门设计的系统中测量了许多蒽衍生物的荧光寿命。所得结果总结如下：1。测定了几种蒽衍生物在超音速自由射流（气相）和溶液中的辐射寿命。通过溶剂的折射率n^2zeta_f（溶液）=zeta_f（气相）2，可以将两相的值联系起来。通过比较两相的辐射寿命建立的关系在溶液中进一步检验。溶剂的折射率随静水压力的施加而变化。除9,10 -二甲氧基蒽外，在0.1 MPa ~ 400 MPa的压力范围内，5种蒽衍生物的荧光量子产率基本等于1，均遵循良好的n^2关系。在中心分子周围形成的微观分子环境取决于中心分子的形状。这可能导致n相关性不同于n²相关性。为了证实这一点，我们研究了压力对POPOP、QUI、BBQ和Bis-MSB的荧光寿命的影响，它们都是长链形状的。此外，在稀有气体基质或液滴中进行了荧光寿命测量，以获得扩展本研究所需的基本数据。