@Article{JAMS-9-3,
author = {},
title = {Can the Fluorescence Quantum Yield Be Enhanced by Introducing the Benzene Ring to the Blue Fluorescent Protein Chromophore?},
journal = {Journal of Atomic and Molecular Sciences},
year = {2018},
volume = {9},
number = {3},
pages = {42--45},
abstract = {<p style="text-align: justify;">The green fluorescent protein (GFP) has been widely used in biochemical and biological fields for
its strong fluorescence emitting property. The effective fluorescence emitting property lies in its
chromophore P-HBI. Compared with GFP, the low fluorescence quantum yield (0.2 vs. 0.8 of GFP) of the wild
blue fluorescent protein (BFP) restrict its extensive applications. In order to enhance the fluorescent
quantum yield of BFP, numerous attempts have been executed to modify the molecular configuration such
as introducing the intramolecular hydrogen bond (IHB) or benzene ring to the parent structure. In the
present work, we employed the high-level quantum chemistry calculation method CASSCF to investigate the
excited state deactivation mechanism of 4-BFP, which is a newly synthesized BFP chromophore derivative by
introducing a benzene ring to the five-membered heterocycle attempting to increase the fluorescence
quantum yield. By combination of the optimization of stable electronic structures, scanning of potential
energy surfaces and construction of energy profile, we found that the fluorescent quantum yield could not
be enhanced for the 4-BFP molecule. One minimum energy conical intersection was located between the S1
and S0 states, which could act as the gateway for the 4-BFP to funnel to the ground state by the internal
conversion process. The current work could provide fundamental guide for further molecular structure
modification or improvement to enhance the fluorescent quantum yield of BFP analogues.</p>},
issn = {2079-7346},
doi = {https://doi.org/10.4208/jams.102518.113018a},
url = {https://global-sci.com/article/74193/can-the-fluorescence-quantum-yield-be-enhanced-by-introducing-the-benzene-ring-to-the-blue-fluorescent-protein-chromophore}
}