scholarly journals Enantioenrichments of α -Amino Acids With High-Intensity Excimer Laser

1999 ◽  
Vol 18 (3) ◽  
pp. 143-154 ◽  
Author(s):  
Yuichi Shimizu
Keyword(s):  
Amino Acids ◽  
Intermolecular Interaction ◽  
Functional Groups ◽  
Excimer Laser ◽  
High Intensity ◽  
Chemical Structure ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
First Time

It has been found that the irradiation with highly intense circularly polarized light (CPL) from an XeF (351 nm) laser can induce the enantiodifferentiation of racemic methionine with reasonable enantiocontrol by switching the sense of the CPL. Also, a similar result was obtained for threonine and it was newly revealed that the enantioenrichment is largely affected by the chemical structure, especially the functional groups, of α-amino acids, to cause photodecomposition such as decarboxylation and deamination. Furthermore, it was shown for the first time that the irradiation of a proline (Pro)-valine (Val) mixture with the CPL induces their enantioselective decomposition simultaneously, suggesting the occurrence of intermolecular interaction between Pro and Val.

Isopinocampheyl-based C-BODIPYs: A model strategy to construct cost-effective boron-chelate emitters of circularly polarized light

2021 ◽  
Author(s):  
Josue Jiménez ◽  
Florencio Moreno Jiménez ◽  
Teresa Arbeloa López ◽  
Trevor A. Cabreros ◽  
Gilles Muller ◽  
...  
Keyword(s):  
Polarized Light ◽  
Cost Effective ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
First Time ◽  
Boron Chelate

Efficient circularly polarized luminescence (CPL) brightness from 4,4-diisopinocampheylBODIPY is detected for the first time. This finding demonstrates the workability of a new design, based on using chiral-pool derived chloro(diisopinocampheyl)borane, to...

TWO-DIMENSIONAL CIRCULARLY-POLARIZED-LIGHT PHOTOELECTRON DIFFRACTION FOR THE ANALYSIS OF MAGNETIC AND ELECTRONIC PROPERTIES ON SURFACES

2000 ◽  
Vol 07 (05n06) ◽  
pp. 643-647 ◽  
Author(s):  
K. ENOMOTO ◽  
Y. MIYATAKE ◽  
K. FUKUMOTO ◽  
A. KOBAYASHI ◽  
K. HATTORI ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Polarized Light ◽  
Emission Angle ◽  
Two Dimensional ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Photoelectron Diffraction ◽  
Angle Dependence ◽  
First Time ◽  
Good Agreement

Circular dichroism has been measured in the photoelectron diffraction of bulk W 4f photoelectrons from the W(110)(1×1) clean surface. The forward focusing peaks along the symmetric axis in the diffraction pattern showed an azimuthal rotation similar to those reported in a prior experiment on Si(001) and chemically shifted W 4f photoelectrons from the W(110)(1×1)-O surface. The emission angle dependence of the rotation angles has been measured and analyzed for the first time and the angles observed are in good agreement with those calculated using the formula Δ ϕ=m/kR sin 2θ derived previously by Daimon et al. [Jpn. J. Phys.32, L1480 (1993)] considering the angular dependence of m. This property gives a basis for the analysis of structure or various magnetic and electronic properties on surfaces.

Mechanism of pH-Dependent Photolysis of Aliphatic Amino Acids and Enantiomeric Enrichment of Racemic Leucine by Circularly Polarized Light

2001 ◽  
Vol 3 (6) ◽  
pp. 921-924 ◽  
Author(s):  
Hideo Nishino ◽  
Atsuko Kosaka ◽  
Guy A. Hembury ◽  
Hiroshi Shitomi ◽  
Hideo Onuki ◽  
...  
Keyword(s):  
Amino Acids ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Enantiomeric Enrichment ◽  
Ph Dependent

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Blue Circularly Polarized Luminescent Amorphous Molecules with Single-handed Propeller Chirality Induced by Circularly Polarized Light Irradiation

2021 ◽  
Author(s):  
Zhaoming Zhang ◽  
Takunori Harada ◽  
Adriana Pietropaolo ◽  
Yuting Wang ◽  
Yue Wang ◽  
...  
Keyword(s):  
Polarized Light ◽  
Light Irradiation ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Trigonal Symmetry ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Preferred-handed propeller conformation was induced by circularly polarized light irradiation to three amorphous molecules with trigonal symmetry, and the molecules with induced chirality efficiently exhibited blue circularly polarized luminescence. In...

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