Substituted p-Benzoquinones Having High Electron Affinity as Photosystem II Electron Acceptors

1980 ◽  
Vol 35 (1-2) ◽  
pp. 136-138 ◽  
Author(s):  
H. Daniell ◽  
G. Kulandaivelu ◽  
U. Chandra Singh
Keyword(s):  
Photosystem Ii ◽  
Electron Affinity ◽  
Photosynthetic Electron Transport ◽  
Electron Acceptors ◽  
High Electron ◽  
Whole Cells ◽  
High Electron Affinity ◽  
Transport Chain ◽  
Alkoxy Groups ◽  
Fold Stimulation

Abstract Substituted Benzoquinones, Photosystem II Acceptors Benzoquinones (BQ) substituted with alkyl or alkoxy groups 2,5-dimethoxy-3,6-dichloro-p-benzoquinone (DCDMQ), 2,3,5,6-tetramethoxy-p-benzoquinone (TMQ) have been tested for their electron affinity and site of action in the photosynthetic electron transport chain in whole cells and chloroplasts. Both the substituted compounds were found to be good electron acceptors of photosystem II. DCDMQ showed higher electron affinity than BQ as demonstrated by its two fold stimulation of O2 evolution in chloroplasts and efficiency in quenching DCMU fluorescence. TMQ on the other hand showed low electron affinity.

scholarly journals The Role of Selected Wavelengths of Light in the Activity of Photosystem II in Gloeobacter violaceus

2021 ◽  
Vol 22 (8) ◽  
pp. 4021
Author(s):  
Monika Kula-Maximenko ◽  
Kamil Jan Zieliński ◽  
Ireneusz Ślesak
Keyword(s):  
Photosystem Ii ◽  
Spectral Composition ◽  
Photosynthetic Electron Transport ◽  
Metabolic Energy ◽  
Light Conditions ◽  
Gloeobacter Violaceus ◽  
Transport Chain ◽  
Cyanobacterial Culture ◽  
Photosynthetic Antennas

Gloeobacter violaceus is a cyanobacteria species with a lack of thylakoids, while photosynthetic antennas, i.e., phycobilisomes (PBSs), photosystem II (PSII), and I (PSI), are located in the cytoplasmic membrane. We verified the hypothesis that blue–red (BR) light supplemented with a far-red (FR), ultraviolet A (UVA), and green (G) light can affect the photosynthetic electron transport chain in PSII and explain the differences in the growth of the G. violaceus culture. The cyanobacteria were cultured under different light conditions. The largest increase in G. violaceus biomass was observed only under BR + FR and BR + G light. Moreover, the shape of the G. violaceus cells was modified by the spectrum with the addition of G light. Furthermore, it was found that both the spectral composition of light and age of the cyanobacterial culture affect the different content of phycobiliproteins in the photosynthetic antennas (PBS). Most likely, in cells grown under light conditions with the addition of FR and G light, the average antenna size increased due to the inactivation of some reaction centers in PSII. Moreover, the role of PSI and gloeorhodopsin as supplementary sources of metabolic energy in the G. violaceus growth is discussed.

Optical excitations of poly(3-butylthiophene) and high electron affinity substituted poly(3-butylthiophene)

1995 ◽  
Vol 69 (1-3) ◽  
pp. 321-324 ◽  
Author(s):  
Y. Greenwald ◽  
X. Wei ◽  
S. Jeglinski ◽  
J. Poplawski ◽  
E. Ehrenfreund ◽  
...  
Keyword(s):  
Electron Affinity ◽  
High Electron ◽  
High Electron Affinity ◽  
Optical Excitations

Synthesis and characterization of solution processable, high electron affinity molecular dopants

2021 ◽  
Author(s):  
Jan Saska ◽  
Nikolay E. Shevchenko ◽  
Goktug Gonel ◽  
Zaira I. Bedolla-Valdez ◽  
Rachel M. Talbot ◽  
...  
Keyword(s):  
Electron Affinity ◽  
Ionization Energy ◽  
Synthesis And Characterization ◽  
High Electron ◽  
High Electron Affinity ◽  
High Ionization ◽  
Solution Processable

New organic-soluble dopants have record high electron affinity values and show outstanding doping performance with high ionization energy co-polymers.

High Electron Affinity Molecular Dopant CN6-CP for Efficient Organic Light-Emitting Diodes

2019 ◽  
Vol 11 (12) ◽  
pp. 11660-11666 ◽  
Author(s):  
Yuan Liu ◽  
Bernhard Nell ◽  
Katrin Ortstein ◽  
Zhongbin Wu ◽  
Yevhen Karpov ◽  
...  
Keyword(s):  
Electron Affinity ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
High Electron ◽  
Light Emitting ◽  
Organic Light ◽  
High Electron Affinity

Comparative investigation of surface transfer doping of hydrogen terminated diamond by high electron affinity insulators

2016 ◽  
Vol 120 (2) ◽  
pp. 025104 ◽  
Author(s):  
C. Verona ◽  
W. Ciccognani ◽  
S. Colangeli ◽  
E. Limiti ◽  
Marco Marinelli ◽  
...  
Keyword(s):  
Electron Affinity ◽  
Comparative Investigation ◽  
High Electron ◽  
High Electron Affinity

Synthesis and Properties of Novel High-Electron-Affinity Polymers for Electroluminescent Devices

1997 ◽  
pp. 322-344 ◽  
Author(s):  
Xiao-Chang Li ◽  
Andrew C. Grimsdale ◽  
Raoul Cervini ◽  
Andrew B. Holmes ◽  
Stephen C. Moratti ◽  
...  
Keyword(s):  
Electron Affinity ◽  
High Electron ◽  
Electroluminescent Devices ◽  
High Electron Affinity

Naphthalimide incorporating oxadiazole: potential electroluminescent materials with high electron affinity

2003 ◽  
Vol 137 (1-3) ◽  
pp. 1129-1130 ◽  
Author(s):  
Weihong Zhu ◽  
Liqiang Fan ◽  
Rong Yao ◽  
Fang Wu ◽  
He Tian
Keyword(s):  
Electron Affinity ◽  
High Electron ◽  
High Electron Affinity

Efficient interchain photoluminescence in a high-electron-affinity conjugated polymer

1995 ◽  
Vol 52 (16) ◽  
pp. R11573-R11576 ◽  
Author(s):  
I. D. W. Samuel ◽  
G. Rumbles ◽  
C. J. Collison
Keyword(s):  
Electron Affinity ◽  
Conjugated Polymer ◽  
High Electron ◽  
High Electron Affinity

Tuning the optoelectronic properties of core-substituted naphthalene diimides by the selective conversion of imides to monothioimides

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 46534-46539 ◽  
Author(s):  
F. S. Etheridge ◽  
R. Fernando ◽  
J. A. Golen ◽  
A. L. Rheingold ◽  
G. Sauve
Keyword(s):  
Electron Affinity ◽  
Optoelectronic Properties ◽  
High Electron ◽  
Optical Gap ◽  
Selective Conversion ◽  
Naphthalene Diimide ◽  
High Electron Affinity ◽  
Naphthalene Diimides

Molecules with a low optical gap and high electron affinity were obtained via selective thionation of the distal carbonyls of 2,6-dialkylamino core-substituted naphthalene diimide.

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