Self association of α-tocopherol in solutions. Infrared absorption and theoretical study

2016 ◽  
Vol 1109 ◽  
pp. 74-81 ◽  
Author(s):  
E.I. Finkelshtein ◽  
T.A. Morozova ◽  
R.S. Shamsiev ◽  
E.A. Belozertseva ◽  
E.A. Katsman
Keyword(s):  
Infrared Absorption ◽  
Theoretical Study ◽  
Self Association

Bent Cyclopenta-2,4-dienylideneketene: Spectroscopic and ab initio Study of Reactive Intermediate

1998 ◽  
Vol 63 (8) ◽  
pp. 1094-1106 ◽  
Author(s):  
Juliusz G. Radziszewski ◽  
Piotr Kaszynski ◽  
Anders Friderichsen ◽  
Jens Abildgaard
Keyword(s):  
Absorption Spectrum ◽  
Ab Initio ◽  
Phthalic Anhydride ◽  
Infrared Absorption ◽  
Triple Bond ◽  
Theoretical Study ◽  
Infrared Absorption Spectrum ◽  
Matrix Isolation ◽  
Reactive Intermediate ◽  
Ab Initio Study

Results of an experimental and theoretical study of cyclopenta-2,4-dienylideneketene (3), a highly unstable reactive intermediate, are reported. The ketene was prepared, under matrix isolation conditions at 4.2 or 10 K, by laser photocarbonylation of 1,2-didehydrobenzene (1) photogenerated earlier from phthalic anhydride (2). FTIR polarization measurements performed on partially photooriented samples of 3 immobilized in solid neon or argon provide infrared transition moment directions for most of the observed vibrations. Experimental results confirm that the ketene is bent, as predicted by ab initio calculations. Utilizing two isotopically modified 3, 3b and 3c, on the basis of the infrared absorption spectrum alone, we have analyzed and assigned its vibrations in a way, which leaves no doubt about the bent ketene structure. This work was motivated by a long standing confusion surrounding the assignments of the vibrations in 1,2-didehydrobenzene (1), especially of its "triple" bond stretch.

Paddlewheel-type diruthenium(iii,iii) tetrakis(2-aminopyridinate) complexes with NIR absorption features: combined experimental and theoretical study

2019 ◽  
Vol 48 (33) ◽  
pp. 12421-12429
Author(s):  
Yusuke Kataoka ◽  
Nanako Imasaki ◽  
Kazuki Arakawa ◽  
Natsumi Yano ◽  
Hiroshi Sakiyama ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Near Infrared ◽  
Theoretical Study ◽  
Nir Absorption ◽  
Absorption Features

Aminopyridinate-bridged Ru2(iii,iii) complexes with near-infrared absorption features were prepared and characterized by experimental and theoretical techniques.

Linear oligopeptides. 99. An infrared absorption method to titrate quantitatively the extent of self-association in peptides

1984 ◽  
Vol 106 (5) ◽  
pp. 1455-1457 ◽  
Author(s):  
Claudio Toniolo ◽  
Gian Maria Bonora ◽  
Fernando Marchiori ◽  
Gianfranco Borin
Keyword(s):  
Infrared Absorption ◽  
Absorption Method ◽  
Self Association

Theoretical study on residual infrared absorption of Ti: sapphire laser crystals

2021 ◽  
Author(s):  
Qiaorui Gong ◽  
Yilun Yang ◽  
Qiannan Fang ◽  
Shanming Li ◽  
Min Xu ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Theoretical Study ◽  
Sapphire Laser ◽  
Laser Crystals
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