Unveiling Electronic Transitions in Three Novel Chiral Azo-Compounds Using Linear and Nonlinear Circular Dichroism: A Theoretical−Experimental Study

2011 ◽  
Vol 115 (7) ◽  
pp. 1186-1193 ◽  
Author(s):  
Carlos Toro ◽  
Rémy Passier ◽  
Carlos Diaz ◽  
Tero Tuuttila ◽  
Kari Rissanen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Circular Dichroism ◽  
Azo Compounds ◽  
Electronic Transitions ◽  
Linear And Nonlinear ◽  
Circular Dichroïsm

Optical Activity of Symmetric Compounds in Chiral Media. I. Induced Circular Dichroism of Unbound Substrates

1971 ◽  
Vol 49 (4) ◽  
pp. 624-631 ◽  
Author(s):  
L. D. Hayward ◽  
R. N. Totty
Keyword(s):  
Circular Dichroism ◽  
Carbonyl Compounds ◽  
Optical Rotation ◽  
Optically Active ◽  
Asymmetric Induction ◽  
Azo Compounds ◽  
Induced Circular Dichroism ◽  
Chiral Media ◽  
Circular Dichroïsm ◽  
Rotational Strengths

In the presence of chiral environment compounds, C, optical rotation is induced in symmetric substrates, S, and may be detected as circular dichroism in the electronic spectra of the solutions. Thus the n − π* transitions of symmetric and racemic carbonyl compounds, and of symmetric nitro and azo compounds, become optically active when these S are dissolved in chiral hydrocarbons, ketones, or carbinols, or in solutions of these C in achiral solvents. The rotational strengths of the induced circular dichroism bands of S are solvent, temperature, and concentration dependent. Only limited correlation of the sign and magnitude of the induced bands with the stereochemistry of C and S is evident on the data so far accumulated. Halogenated achiral solvents enhance the intensity, and, in some cases reverse the sign of the induced bands.A new mechanism of asymmetric induction is proposed in which specific bonding of C with S is not prerequisite.

Circular Dichroism Studies on Chiral 1,3,4,5-Tetrahydro-2H-1,5- benzodiazepin-2-ones

1995 ◽  
Vol 50 (12) ◽  
pp. 1869-1882 ◽  
Author(s):  
Khalid Mohammed Khan ◽  
Farnaz Malik ◽  
Mashooda Hasan ◽  
Shahnaz Perveen ◽  
Günther Snatzke ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Electronic Transitions ◽  
Circular Dichroïsm

From forty one chiral benzodiazepin-2-ones the UV and CD data are reported and the bands discussed with respect to corresponding electronic transitions respectively stereochemical features.

Linear and nonlinear circular dichroism of R-(+)-3-methylcyclopentanone

2006 ◽  
Vol 125 (14) ◽  
pp. 144304 ◽  
Author(s):  
R. Li ◽  
R. Sullivan ◽  
W. Al-Basheer ◽  
R. M. Pagni ◽  
R. N. Compton
Keyword(s):  
Circular Dichroism ◽  
Linear And Nonlinear ◽  
Circular Dichroïsm

Experimental study of the photoinduction mechanism in silicon-doped yttrium iron garnet by means of "first-order" circular dichroism

1975 ◽  
Vol 12 (9) ◽  
pp. 3840-3844 ◽  
Author(s):  
B. Antonini ◽  
A. Paoletti ◽  
P. Paroli ◽  
A. Tucciarone ◽  
J. F. Dillon ◽  
...  
Keyword(s):  
Experimental Study ◽  
Circular Dichroism ◽  
Yttrium Iron Garnet ◽  
Yttrium Iron ◽  
First Order ◽  
Silicon Doped ◽  
Iron Garnet ◽  
Circular Dichroïsm

scholarly journals Magnetic circular dichroism of UCl6− in the ligand-to-metal charge-transfer spectral region

2017 ◽  
Vol 19 (26) ◽  
pp. 17300-17313 ◽  
Author(s):  
Frédéric Gendron ◽  
Valerie E. Fleischauer ◽  
Thomas J. Duignan ◽  
Brian L. Scott ◽  
Matthias W. Löble ◽  
...  
Keyword(s):  
Experimental Study ◽  
Circular Dichroism ◽  
Charge Transfer ◽  
Ab Initio ◽  
Spectral Region ◽  
Magnetic Circular Dichroism ◽  
Metal Charge ◽  
Circular Dichroïsm ◽  
Metal Charge Transfer ◽  
Complex Ion

We present a combined ab initio theoretical and experimental study of the magnetic circular dichroism (MCD) spectrum of the octahedral UCl6− complex ion in the UV-Vis spectral region.

The chiroptical properties of the strychnine alkaloids: strychnine, β-colubrine, brucine, and their dihydro derivatives

1978 ◽  
Vol 56 (9) ◽  
pp. 1222-1230 ◽  
Author(s):  
Julian W. Show ◽  
Thomas M. Hooker Jr.
Keyword(s):  
Circular Dichroism ◽  
Spectroscopic Properties ◽  
Ultraviolet Absorption ◽  
Electronic Transitions ◽  
Ultraviolet Region ◽  
Circular Dichroism Spectra ◽  
Experimental Conditions ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

Ultraviolet absorption and circular dichroism spectra of the strychnine alkaloids strychnine, β-colubrine, brucine, dihydrostrychnine, dihydro-β-colubrine, and dihydrobrucine have been investigated under various experimental conditions. It appears that at least five electronic transitions are required to account for the spectroscopic properties of these molecules in the ultraviolet region above 190 nm. Transitions, which are tentatively assigned as the 1Lb, 1La, 1Bb, and 1Ba in the notation due to Platt, and an n → π* transition apparently make significant contributions to the spectra of ail of the molecules studied.

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