首页> 外文会议>12th Symposium on Bioluminescence and Chemiluminescence, Apr 5-9, 2002, Robinson College, University of Cambridge, UK >OPTICAL PROPERTIES OF FIREFLY OXYLUCIFERIN, THE LIGHT EMITTER IN FIREFLY CHEMI- AND BIOLUMINESCENCE
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OPTICAL PROPERTIES OF FIREFLY OXYLUCIFERIN, THE LIGHT EMITTER IN FIREFLY CHEMI- AND BIOLUMINESCENCE

机译:全氧荧光素,全化学发光和生物发光的光学性质

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摘要

The primary reaction step of firefly chemi- and bioluminescence is essentially the oxygenation of luciferin (Ln) at its C4 site to produce the electronically excited oxyluciferin (Oxyln~*). We have already studied the optical absorptions of Ln and its deprotonated forms in a vacuum and in dimethyl sulfoxide (DMSO) in order to clarify the electronic properties of these compounds by molecular orbital (MO) calculations. In the present work, the optical absorptions of firefly Oxyln, including its mono- and dianions (Oxyln~(-1) ;I = 1,2) were obtained by ab initio calculations within the density functional approximation (B3PW91) using the 6-31G~* basis set in the Gaussian 98 program (Gaussian Inc., Pittsburgh, PA, USA (1998)) and the INDO/S method in MOS-F (Fujitsu Ltd., Tokyo, Japan (1999)) prior to studying the formation process of the electronically excited Oxyln~*. Furthermore, the emission spectrum of Oxyln was evaluated by optimizing its energy not in the ground state but in the excited state, using the semi-empirical MNDO-PM5 method in CAChe 5.0.
机译:萤火虫化学发光和生物发光的主要反应步骤实质上是萤光素(Ln)在其C4位的氧化,以产生电子激发的氧化萤光素(Oxyln〜*)。我们已经在真空和二甲基亚砜(DMSO)中研究了Ln及其去质子化形式的光吸收,以通过分子轨道(MO)计算来阐明这些化合物的电子性质。在目前的工作中,萤火虫Oxyln的光学吸收,包括其一价阴离子和二价阴离子(Oxyln〜(-1); I = 1,2),是通过使用6-密度泛函近似(B3PW91)从头算出的。在研究高斯98程序(美国宾夕法尼亚州匹兹堡的高斯公司(1998年))和MOS-F中的INDO / S方法(日本东京的富士通有限公司(1999年))中设置31G〜*基础。电子激发Oxyln〜*的形成过程此外,使用CAChe 5.0中的半经验MNDO-PM5方法,通过优化不是在基态而是在激发态的能量来评估Oxyln的发射光谱。

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