Approximations for the electric dipole circular dichroism of long helical polymers

1988 ◽  
Vol 92 (21) ◽  
pp. 5891-5895
Author(s):  
David A. Rabenold
Keyword(s):  
Circular Dichroism ◽  
Electric Dipole ◽  
Helical Polymers ◽  
Circular Dichroïsm

Circular dichroism of helical polymers: a short-wavelength formulation

1990 ◽  
Vol 94 (16) ◽  
pp. 6171-6175
Author(s):  
David A. Rabenold
Keyword(s):  
Circular Dichroism ◽  
Short Wavelength ◽  
Helical Polymers ◽  
Circular Dichroïsm

Circular dichroism of oriented molecules. Electric dipole/magnetic dipole and electric dipole/electric quadrupole contribution for cholest-4-en-3-one

1993 ◽  
Vol 4 (3) ◽  
pp. 517-528 ◽  
Author(s):  
Hans-Georg Kuball ◽  
Bernd Schultheis ◽  
Melanie Klasen ◽  
Jadwiga Frelek ◽  
Alfred Schönhofer
Keyword(s):  
Circular Dichroism ◽  
Magnetic Dipole ◽  
Electric Dipole ◽  
Electric Quadrupole ◽  
Oriented Molecules ◽  
Circular Dichroïsm

scholarly journals X-ray Natural Circular Dichroism

2014 ◽  
Vol 70 (a1) ◽  
pp. C1518-C1518
Author(s):  
Andrei Rogalev ◽  
Alexei Bosak ◽  
Fabrice Wilhelm ◽  
Jose Goulon
Keyword(s):  
Circular Dichroism ◽  
Absolute Configuration ◽  
Electric Dipole ◽  
Electric Quadrupole ◽  
Interference Term ◽  
Opposite Parity ◽  
X Ray ◽  
Determination Of Absolute Configuration ◽  
Circular Dichroïsm

Natural Circular Dichroism was only recently discovered in the x-ray range[1]. This effect stems from the interference terms which mix multipole transition moments of opposite parity: the Electric Dipole-Electric Quadrupole (E1.E2) and the Electric Dipole-Magnetic Dipole (E1.M1) exist only in structures with broken space inversion symmetry. The scalar E1.M1 term known to be responsible for Circular Dichroism at optical wavelengths is usually considered to be vanishingly small for core level spectroscopies. The E1.E2 interference term, on the contrary, can be large in the X-ray region, but it is a parity odd second rank tensor and therefore observable only in 13 non-centrosymmetric crystal classes. X-ray Natural Circular Dichroism has now been detected in the XANES region for several uniaxial and biaxial crystals. It can give access to the absolute configuration of chiral absorbing centers. On the other hand, Chiral-EXAFS, i.e. the analog of Magnetic-EXAFS for Natural Circular Dichroism has also been measured recently using a uniaxial optically active crystal of paratellurite (TeO2). Chiral-EXAFS originates from symmetry allowed multiple scattering paths. In this presentation, we wish to report on recent advances in X-ray natural circular dichroism and its applications. Determination of absolute configuration is illustrated with measurements of both E1.E2 and E1.M1 terms in chiral alpha-Ni(H2O)6·SO4 single crystals. Manifestation of X-ray optical acitivity in magnetoelectric crystals will be illustrated with various dichroisms measured at the Fe K-edge in multiferroic GaFeO3 crystal. Finally, we will review briefly the perspectives open by our experiments.

Synthesis and properties of optically active helical polymers from (S)-3-functional-3′-vinyl-BINOL derivatives

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 41103-41107 ◽  
Author(s):  
Chunhui Zhao ◽  
Kunbing Ouyang ◽  
Jin Zhang ◽  
Nianfa Yang
Keyword(s):  
Circular Dichroism ◽  
Optical Rotation ◽  
Optically Active ◽  
Circular Dichroism Spectra ◽  
Specific Optical Rotation ◽  
Helical Polymers ◽  
Vinyl Polymers ◽  
Circular Dichroïsm

Helical vinyl polymers bearing N-heterocycles substituent BINOL derivatives were synthesized. The specific optical rotation and circular dichroism spectra data show the obtained polymers can keep a prevailing helicity of backbone in solution.

Classical theory of circular dichroism in infinite helical polymers

1977 ◽  
Vol 66 (8) ◽  
pp. 3491-3497 ◽  
Author(s):  
Alan I. Levin ◽  
Ignacio Tinoco
Keyword(s):  
Circular Dichroism ◽  
Classical Theory ◽  
Helical Polymers ◽  
Circular Dichroïsm

Prediction of pure electric-dipole two-photon absorption circular dichroism in lanthanide compounds

2000 ◽  
Vol 256 (2) ◽  
pp. 207-212 ◽  
Author(s):  
S. Naguleswaran ◽  
M.F. Reid ◽  
G.E. Stedman
Keyword(s):  
Circular Dichroism ◽  
Electric Dipole ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Circular Dichroïsm

scholarly journals Overtone spectra of helical polymers: Infrared absorption and vibrational circular dichroism

1986 ◽  
Vol 84 (6) ◽  
pp. 3545-3552 ◽  
Author(s):  
I. J. Lalov ◽  
D. A. Svetogorski ◽  
N. P. Turkedjiev
Keyword(s):  
Circular Dichroism ◽  
Infrared Absorption ◽  
Vibrational Circular Dichroism ◽  
Helical Polymers ◽  
Circular Dichroïsm

Circular dichroism band shapes for helical polymers

1988 ◽  
Vol 92 (17) ◽  
pp. 4863-4868 ◽  
Author(s):  
David A. Rabenold
Keyword(s):  
Circular Dichroism ◽  
Helical Polymers ◽  
Circular Dichroism Band ◽  
Circular Dichroïsm

ChemInform Abstract: Circular Dichroism of Oriented Molecules. Electric Dipole/Magnetic Dipole and Electric Dipole/Electric Quadrupole Contribution for Cholest-4-en-3-one.

ChemInform ◽  
2010 ◽  
Vol 24 (30) ◽  
pp. no-no
Author(s):  
H.-G. KUBALL ◽  
B. SCHULTHEIS ◽  
M. KLASEN ◽  
J. FRELEK ◽  
A. SCHOENHOFER
Keyword(s):  
Circular Dichroism ◽  
Magnetic Dipole ◽  
Electric Dipole ◽  
Electric Quadrupole ◽  
Oriented Molecules ◽  
Circular Dichroïsm
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