The First Circular Dichroism Observation for Organic Radical Cations: Chiroptical Properties of Neomenthyloxy- and Isobornyloxyanisole Radical Cations

2002 ◽  
Vol 7 (2-3) ◽  
pp. 115-118 ◽  
Author(s):  
Tadashi Mori ◽  
Junya Shinkuma ◽  
Masafumi Sato ◽  
Hideaki Saito ◽  
Takehiko Wada ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Radical Cations ◽  
Organic Radical ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

The near infra red (NIR) chiroptical properties of nickel dithiolene complexes

2015 ◽  
Vol 39 (1) ◽  
pp. 122-129 ◽  
Author(s):  
Yann Le Gal ◽  
Antoine Vacher ◽  
Vincent Dorcet ◽  
Marc Fourmigué ◽  
Jeanne Crassous ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Thin Layer ◽  
Chiroptical Properties ◽  
Infra Red ◽  
Redox Switching ◽  
Circular Dichroïsm

Circular dichroism (CD) thin layer spectro-electrochemical experiments reveal a redox switching of CD-active bands in the NIR region.

Electronic and Vibrational Circular Dichroism of Model β-Lactams: 3-Methyl- and 4-Methylazetidin-2-one

1996 ◽  
Vol 50 (5) ◽  
pp. 630-641 ◽  
Author(s):  
Jennifer McCann ◽  
Arvi Rauk ◽  
Gennadii V. Shustov ◽  
Hal Wieser ◽  
Danya Yang
Keyword(s):  
Circular Dichroism ◽  
Ab Initio ◽  
Electronic Transition ◽  
Vibrational Circular Dichroism ◽  
Protic Solvent ◽  
Free Energies ◽  
Chiroptical Properties ◽  
Circular Dichroïsm ◽  
Rotational Strengths ◽  
Simple Modeling

The chiroptical properties of the simplest chiral β-lactams, 3- and 4-methylazetidin-2-one, 1 and 2, respectively, were investigated. The experimental vibrational circular dichroism (VCD) and electronic circular dichroism (ECD) spectra were measured and compared with ab initio predictions. Both compounds were found to form dimers with calculated binding enthalpies and free energies of about −51 kJ/mol and −6 to −8 kJ/mol, respectively. The experimentally measured IR and VCD spectra were measured in concentrated nonpolar (CCl4) solution and are in agreement with the predicted IR and VCD spectra of the dimeric forms, 12 and 22, but not the monomers. The most intense dimer VCD bands originate from in-plane N-H wags, which perturb the H-bonded cyclic array. At the more dilute concentrations employed for the ECD spectra, the experimental ECD spectra in heptane were interpreted satisfactorily as arising from a mixture consisting predominantly of monomers. In protic solvent (H2O, MeOH), the ECD spectra are consistent with H-bonded monomers. Simple modeling suggests that the rotational strengths of the first electronic transition gain most of their intensity from the nonplanarity of the amide chromophore, the contributions of which follow a spiral rule previously enunciated.

Chiroptical properties of 12,15-dichloro[3.0]orthometacyclophane—correlations between molecular structure and circular dichroism spectra of a biphenylophane

1999 ◽  
Vol 10 (11) ◽  
pp. 2153-2164 ◽  
Author(s):  
Christoph Niederalt ◽  
Stefan Grimme ◽  
Sigrid D Peyerimhoff ◽  
Adam Sobanski ◽  
Fritz Vögtle ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Circular Dichroism ◽  
Circular Dichroism Spectra ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

Circular dichroism, XCV. Chiroptical properties of stereoisomeric conjugated oximes, I

1991 ◽  
Vol 1991 (1) ◽  
pp. 89-91 ◽  
Author(s):  
Jadwiga Frelek ◽  
Liang Huang ◽  
Francis Kerek ◽  
Günther Snatzke ◽  
Wojciech J. Szczepek
Keyword(s):  
Circular Dichroism ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

Chiroptical Properties of cisoid Enones from Circular Dichroism (CD) and Anisotropic Circular Dichroism (ACD) Spectroscopy

2002 ◽  
Vol 8 (8) ◽  
pp. 1899 ◽  
Author(s):  
Jadwiga Frelek ◽  
Wojciech J. Szczepek ◽  
Stephan Neubrech ◽  
Bernd Schultheis ◽  
Joachim Brechtel ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

Circular dichroism of alkaloids of colchicine type and their derivatives

1982 ◽  
Vol 47 (8) ◽  
pp. 2258-2279 ◽  
Author(s):  
Jaromír Hrbek ◽  
Ladislav Hruban ◽  
Vilím Šimánek ◽  
František Šantavý ◽  
Günther Snatzke ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Cd Spectra ◽  
Chiroptical Properties ◽  
Circular Dichroïsm

The CD spectra of 48 colchicine alkaloids and of some of their derivatives were given. The effects of the substituents and of the basic skeleton on the chiroptical properties of the measured compounds were discussed.

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