Photochemistry with circularly polarized light. Synthesis of optically active hexahelicene

1971 ◽  
Vol 93 (9) ◽  
pp. 2353-2354 ◽  
Author(s):  
Henri Kagan ◽  
A. Moradpour ◽  
J. F. Nicoud ◽  
Gilbert Balavoine ◽  
G. Tsoucaris
Keyword(s):  
Polarized Light ◽  
Optically Active ◽  
Circularly Polarized Light ◽  
Circularly Polarized

scholarly journals Synthesis and efficient circularly polarized light emission of an optically active hyperbranched poly(fluorenevinylene) derivative

2011 ◽  
Vol 47 (13) ◽  
pp. 3799 ◽  
Author(s):  
Juin-Meng Yu ◽  
Takeshi Sakamoto ◽  
Kento Watanabe ◽  
Seiichi Furumi ◽  
Nobuyuki Tamaoki ◽  
...  
Keyword(s):  
Light Emission ◽  
Polarized Light ◽  
Optically Active ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Hyperbranched Poly

scholarly journals Predominantly left-handed circular polarization in comets: Does it indicate L-enantiomeric excess in cometary organics?

2008 ◽  
Vol 4 (S251) ◽  
pp. 311-312 ◽  
Author(s):  
V. Rosenbush ◽  
N. Kiselev ◽  
L. Kolokolova
Keyword(s):  
Light Scattering ◽  
Circular Polarization ◽  
Enantiomeric Excess ◽  
Polarized Light ◽  
Optically Active ◽  
Active Materials ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Cometary Dust ◽  
Left Handed

AbstractPolarimetric observations demonstrated that all comets with significant values of circular polarization show predominantly left–handed circularly polarized light. We discuss the presence of homochiral organics in cometary materials as a source of the observed circular polarization. We have studied the effect of chirality on light–scattering properties of cometary dust considering particles that possess optical activity. Our investigations show that the cometary dust may include optically active materials which can be prebiological homochiral organics.

Optically Active Covalent Organic Frameworks and Hyperbranched Polymers with Chirality Induced by Circularly Polarized Light

2021 ◽  
Author(s):  
Yuting Wang ◽  
Koji Yazawa ◽  
Qingyu Wang ◽  
Takunori Harada ◽  
Shuhei SHIMODA ◽  
...  
Keyword(s):  
Polarized Light ◽  
Hyperbranched Polymers ◽  
Optically Active ◽  
Covalent Organic Frameworks ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Axial Chirality

Axial chirality was induced by circularly polarized light (CPL) irradiation to insoluble polymeric covalent organic frameworks (COF’s) as well as soluble hyperbranched polymers (HBP’s) composed of bezene-1,3,5-triyl groups as trigonal...

A quantum electrodynamical theory of differential scattering based on a model with two chromophores I. Differential Rayleigh scattering of circularly polarized light

1978 ◽  
Vol 358 (1694) ◽  
pp. 297-310 ◽  
Keyword(s):  
Quantum Electrodynamics ◽  
Rayleigh Scattering ◽  
Polarized Light ◽  
Incident Radiation ◽  
Optically Active ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Out Of Plane ◽  
Chiral Systems ◽  
Higher Order Corrections

Chiral systems can scatter circularly polarized photons at rates dependent on the handedness of the incident radiation. Differential intensities of Raman scattering by optically active organic molecules have been observed recently. The present work deals with the theory of both Rayleigh and Raman differential scattering by using quantum electrodynamics. The calculations of differential intensities are based on a two-chromophore model in which the chromophores, assumed to be achiral in isolation, become optically active due to their dissymmetric arrangement. Results are reported for both ‘in-plane’ and ‘out-of-plane’ polarizations of the scattered radiation. They apply to an arbitrary scattering geometry and group separation. The limiting near- and far-zone behaviour is analysed in detail. In this paper (part I), the basic theory common to Rayleigh and Raman differential scattering is presented and is then applied to the Rayleigh process. The application to the Raman process is given in part II. In the Rayleigh case, the dominant contribution to the differential effect arises from interference of second-order probability amplitudes. This term varies linearly with the inter-chromophore separation in the near-zone, but inversely in the far-zone. Higher-order corrections to the differential intensities involve coupling between the chromophores; the leading correction, involving the interference of the second- and fourth-order amplitudes, has been computed.

Optically active triptycenes containing hexa-peri-hexabenzocoronene units

2019 ◽  
Vol 55 (76) ◽  
pp. 11386-11389 ◽  
Author(s):  
Yuya Wada ◽  
Ken-ichi Shinohara ◽  
Tomoyuki Ikai
Keyword(s):  
Polarized Light ◽  
Optically Active ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left And Right

We have successfully generated both left- and right-handed circularly polarized light using crystals prepared from a racemic triptycene containing hexa-peri-hexabenzocoronene units.

SECOND HARMONIC GENERATION UPON THERMAL POLING AND LIGHT-INDUCED CHIRALITY IN THE AMORPHOUS p(DR1M) AZOBENZENE POLYMER FILMS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 427-431 ◽  
Author(s):  
V. RODRIGUEZ ◽  
F. ADAMIETZ ◽  
L. SANGUINET ◽  
TH. BUFFETEAU ◽  
C. SOURISSEAU
Keyword(s):  
Second Harmonic ◽  
Polarized Light ◽  
Optically Active ◽  
Side Chain ◽  
Circularly Polarized Light ◽  
Thermal Poling ◽  
Circularly Polarized ◽  
Crystal Polymer ◽  
Azobenzene Polymer ◽  
Poling Direction

We report experimental evidence for an efficient nonlinear optical polar ordering induced by wire poling under high field conditions in thin films of the amorphous p(DR1M) side-chain azobenzene homopolymer. Unusual enhancements of the absorption coefficient and d33 susceptibility along the poling direction are observed. Preliminary circular dichroism experiments have revealed the formation of a weak optically active supramolecular structure which becomes strongly active after irradiating the poled material with a circularly polarized light. Similar to a liquid-crystal polymer mesophase, it is thus possible to control the chirality in this efficiently poled amorphous achiral azobenzene polymer, in which circularly polarized irradiations with opposite handedness produce enantiomeric structures.

Sign in / Sign up

Export Citation Format

Share Document