Color Tuning of Mechanochromic Luminescent β-Diketones via Boron Coordination and Donor-Acceptor Effects

2018 ◽  
Vol 122 (33) ◽  
pp. 19090-19099 ◽  
Author(s):  
Tristan Butler ◽  
Meng Zhuang ◽  
Cassandra L. Fraser
Keyword(s):  
Color Tuning ◽  
Donor Acceptor

Color tuning donor–acceptor-type azobenzene dyes by controlling the molecular geometry of the donor moiety

2018 ◽  
Vol 150 ◽  
pp. 89-96 ◽  
Author(s):  
Shigeyuki Yamada ◽  
Junko Bessho ◽  
Hitoya Nakasato ◽  
Osamu Tsutsumi
Keyword(s):  
Molecular Geometry ◽  
Color Tuning ◽  
Donor Acceptor ◽  
Donor Moiety

scholarly journals Mechanism of Color and Photoacidity Tuning for the Protonated Green Fluorescent Protein Chromophore

2020 ◽  
Author(s):  
Chi-Yun Lin ◽  
Steven Boxer
Keyword(s):  
Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Stokes Shift ◽  
Site Directed Mutagenesis ◽  
Color Tuning ◽  
Tuning Mechanism ◽  
Donor Acceptor ◽  
Form Model ◽  
Gfp Chromophore ◽  
Green Fluorescent

The neutral or A state of the green fluorescent protein (GFP) chromophore is a remarkable example of a photoacid naturally embedded in the protein environment and accounts for the large Stokes shift of GFP in response to near UV excitation. Its color tuning mechanism has been largely overlooked, as it is less preferable for imaging applications than the redder anionic or B state. Past studies, based on site-directed mutagenesis or solvatochromism of the isolated chromophore, have concluded that its color tuning range is much narrower than its anionic counterpart. However, as we performed extensive investigation on more GFP mutants, we found the color of the neutral chromophore to be much more sensitive to protein electrostatics. Electronic Stark spectroscopy reveals a fundamentally different electrostatic color tuning mechanism for the neutral state of the chromophore that demands a three-form model compared with that of the anionic state, which requires only two forms. Specifically, an underlying zwitterionic charge transfer state is required to explain its sensitivity to electrostatics. As the Stokes shift is tightly linked to the protonated chromophore’s photoacidity and excited-state proton transfer (ESPT), we infer design principles of the GFP chromophore as a photoacid through the color tuning mechanisms of both protonation states. The three-form model could also be applied to similar biological and nonbiological dyes and complements the failure of two-form model for donor–acceptor systems with localized electronic distributions.

Photochromism of metal–organic frameworks based on carbazole-dicarboxylic acid and bipyridine: sensing adjustment by controlling strut-to-strut energy transfer

2020 ◽  
Vol 49 (23) ◽  
pp. 7952-7958 ◽  
Author(s):  
Han Liu ◽  
Yanru Fan ◽  
Xiao Li ◽  
Kuan Gao ◽  
Huijie Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Dicarboxylic Acid ◽  
Metal Organic Frameworks ◽  
Color Tuning ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Judicious Choice

Efficient strut-to-strut energy transfer (antenna behavior) was observed in the well-ordered donor–acceptor system. Color tuning, adjustment of gamut, and regulation of sensitivity can be realized by the judicious choice of the constitutions of MOFs.

Relax: A Sterically Relaxed Donor–Acceptor Approach for Color Tuning in Broadly Absorbing, High Contrast Electrochromic Polymers

2016 ◽  
Vol 49 (17) ◽  
pp. 6350-6359 ◽  
Author(s):  
Justin A. Kerszulis ◽  
Rayford H. Bulloch ◽  
Natasha B. Teran ◽  
Rylan M. W. Wolfe ◽  
John R. Reynolds
Keyword(s):  
High Contrast ◽  
Color Tuning ◽  
Electrochromic Polymers ◽  
Donor Acceptor

scholarly journals Mechanism of Color and Photoacidity Tuning for the Protonated Green Fluorescent Protein Chromophore

2020 ◽  
Author(s):  
Chi-Yun Lin ◽  
Steven Boxer
Keyword(s):  
Green Fluorescent Protein ◽  
Fluorescent Protein ◽  
Stokes Shift ◽  
Site Directed Mutagenesis ◽  
Color Tuning ◽  
Tuning Mechanism ◽  
Donor Acceptor ◽  
Form Model ◽  
Gfp Chromophore ◽  
Green Fluorescent

The neutral or A state of the green fluorescent protein (GFP) chromophore is a remarkable example of a photoacid naturally embedded in the protein environment and accounts for the large Stokes shift of GFP in response to near UV excitation. Its color tuning mechanism has been largely overlooked, as it is less preferable for imaging applications than the redder anionic or B state. Past studies, based on site-directed mutagenesis or solvatochromism of the isolated chromophore, have concluded that its color tuning range is much narrower than its anionic counterpart. However, as we performed extensive investigation on more GFP mutants, we found the color of the neutral chromophore to be much more sensitive to protein electrostatics. Electronic Stark spectroscopy reveals a fundamentally different electrostatic color tuning mechanism for the neutral state of the chromophore that demands a three-form model compared with that of the anionic state, which requires only two forms. Specifically, an underlying zwitterionic charge transfer state is required to explain its sensitivity to electrostatics. As the Stokes shift is tightly linked to the protonated chromophore’s photoacidity and excited-state proton transfer (ESPT), we infer design principles of the GFP chromophore as a photoacid through the color tuning mechanisms of both protonation states. The three-form model could also be applied to similar biological and nonbiological dyes and complements the failure of two-form model for donor–acceptor systems with localized electronic distributions.

Evidence of a donor-acceptor type transition in CuGaSe2

1980 ◽  
Vol 41 (7) ◽  
pp. 707-712 ◽  
Author(s):  
A. Poure ◽  
G. Aguero ◽  
G. Masse ◽  
J.P. Aicardi
Keyword(s):  
Type Transition ◽  
Donor Acceptor
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