Theoretical study of the opsin shift of deprotonated retinal schiff base in the M state of bacteriorhodopsin

2010 ◽  
Vol 12 (40) ◽  
pp. 13107 ◽  
Author(s):  
Kazuhiro J. Fujimoto ◽  
Kota Asai ◽  
Jun-ya Hasegawa
Keyword(s):  
Schiff Base ◽  
Theoretical Study ◽  
Opsin Shift

Theoretical study on the mechanism for the ESDPT process of asymmetric Schiff base ligand

2021 ◽  
Author(s):  
Zhengran Wang ◽  
Qiao Zhou ◽  
Bifa Cao ◽  
Bo Li ◽  
Lixia Zhu ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Theoretical Study

Photochemistry of a Retinal Protonated Schiff-Base Analogue Mimicking the Opsin Shift of Bacteriorhodopsin

2007 ◽  
Vol 111 (9) ◽  
pp. 2327-2334 ◽  
Author(s):  
Oshrat Bismuth ◽  
Noga Friedman ◽  
Mordechai Sheves ◽  
Sanford Ruhman
Keyword(s):  
Schiff Base ◽  
Opsin Shift

Synthesis, characterization, theoretical study and biological activity of Schiff base nanomaterial analogues

2019 ◽  
Vol 1181 ◽  
pp. 645-659 ◽  
Author(s):  
G.G. Mohamed ◽  
W.H. Mahmoud ◽  
M.A. Diab ◽  
A.Z. El-Sonbati ◽  
S.Y. Abbas
Keyword(s):  
Biological Activity ◽  
Schiff Base ◽  
Theoretical Study

SYNTHESIS AND CHARACTERIZATION OF THREE NOVEL SCHIFF BASE COMPOUNDS: EXPERIMENTAL AND THEORETICAL STUDY

2015 ◽  
Vol 119 (3) ◽  
pp. 476-476
Author(s):  
P. T. Taslı ◽  
A. Bayrakdar ◽  
O. O. Karakus ◽  
H. H. Kart ◽  
Y. Koc
Keyword(s):  
Schiff Base ◽  
Theoretical Study ◽  
Synthesis And Characterization

Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base

2020 ◽  
Vol 1 (01) ◽  
pp. 5-16
Author(s):  
Alaa A. Rashad ◽  
Farah Muaiad ◽  
Ahmed Ahmed ◽  
EkhlasA. Salman ◽  
Evon Akram
Keyword(s):  
Schiff Base ◽  
Surface Morphology ◽  
Theoretical Study ◽  
Energy Gap ◽  
Photophysical Properties ◽  
Schiff Base Complex ◽  
Tetrahedral Geometry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Square Planar

 Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using  PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between  4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and 2-hydroxy-1-naphthaldehyde, then Schiff base reacted with Co2+, Ni2+,  and Cu2+ ions,   the synthesized 1, 2, 4-triazole Schiff base, and its complexes were characterized by infrared spectra, magnetic susceptibility, conductivity measurements, photophysical properties, and surface morphology measured by atomic force microscopy. The practical results were reinforced with a theoretical study for these Schiff base complexes. Then the proposed structures of the prepared complexes. Results: 1, 2, 4-triazole Schiff base act as a chelate ligand. The coordination has occurred through the oxygen of the phenolic group O-H and the nitrogen of the imine group N=C of Schiff base with divalent metal ions. Cobalt complex has a tetrahedral geometry, while the nickel and copper complexes have square planar geometries. The stability of all compounds was studied by calculating the energy gap by diffuse reflectance spectroscopy and theoretical calculations. Copper Schiff base is a more stable complex due to the lower value of the energy gap, and the copper Schiff base complex is more semiconductivity than the other complexes. Surface morphology, properties of chelating  Schiff base ligand and its complexes measured by atomic force microscopy, cobalt Schiff base complex is higher roughness. The bond length of (-C=N-), (-C-O-),(M-O), and (M-N)  are affected in the coordination with metal ions, the bond length of the square planar geometry more affected than tetrahedral geometry. Conclusion: All compounds were prepared successfully, characterized, and photophysical properties were studied.  

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