Experimental Evidence of the Sx State and Fluorescence Emission from the Intramolecular Charge Transfer States in Fucoxanthin

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2024-11-18 DOI:10.1039/d4cp03749a

Zhengtang Liu, Wenjun Ni, Yin Huang, Gagik G. Gurzadyan, Xin Chen

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Abstract

Fucoxanthin, a typical carotenoid that absorbs in the blue end of visible light, whose detailed electronic structures remain to be clarified. It is well known that carotenoids harvest energy from sunlight and transfer it to chlorophylls (Chls) and/or bacteriochlorophylls (BChls) through its excited states as the intermediate states, however, some excited states still need evidence to be definitely confirmed. Through steady-state fluorescence emission spectroscopy and femtosecond time-resolved fluorescence up-conversion technique, we provide new evidence for the identification of the excited Sx state in fucoxanthin, a representative of carotenoids. The fluorescence emission from the intramolecular charge transfer (ICT) states was also observed and identified for first time according to our limited survey. Our findings suggest that fucoxanthin absorbs the blue light and transfer most of energy to BChls via S_x and ICT1 states for certain bacteria, but release them via ICT1 state to protect aginst light damage for algea.

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岩藻黄素分子内电荷转移态的 Sx 态和荧光发射的实验证据

类胡萝卜素（Fucoxanthin）是一种典型的类胡萝卜素，可吸收可见光的蓝光，其详细的电子结构仍有待澄清。众所周知，类胡萝卜素从太阳光中获取能量，并通过其激发态作为中间态将能量转移到叶绿素（Chls）和/或细菌叶绿素（BChls），然而，一些激发态仍需要证据来明确证实。通过稳态荧光发射光谱和飞秒时间分辨荧光上转换技术，我们为类胡萝卜素的代表--岩藻黄素中激发态Sx的确定提供了新的证据。根据我们有限的调查，我们还首次观测并确定了分子内电荷转移（ICT）态的荧光发射。我们的研究结果表明，对于某些细菌来说，狐黄素吸收蓝光并通过Sx态和ICT1态将大部分能量转移给BChls，而对于藻类来说，狐黄素则通过ICT1态释放能量以抵御光损伤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.