Twofold Helical Molecular Assemblies in Organic Crystals: Chirality Generation and Handedness Determination

2015 ◽  
pp. 371-392 ◽  
Author(s):  
Mikiji Miyata ◽  
Ichiro Hisaki
Keyword(s):  
Organic Crystals ◽  
Molecular Assemblies

Interpretation of irradiation-induced changes in electron diffractograms and images of extinction contours at low temperatures

1984 ◽  
Vol 42 ◽  
pp. 268-269
Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich
Keyword(s):  
Low Temperatures ◽  
Carbon Films ◽  
Organic Crystals ◽  
Wide Spread ◽  
Lens System ◽  
Preparation Conditions ◽  
Thin Carbon ◽  
Electron Diffractograms ◽  
Diffraction Patterns ◽  
Induced Changes

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.

NONLINEAR CONDUCTIVITY IN QUASI-ONE-DIMENSIONAL ORGANIC CRYSTALS

1981 ◽  
Vol 42 (C7) ◽  
pp. C7-315-C7-322 ◽  
Author(s):  
E. M. Conwell ◽  
N. C. Banik
Keyword(s):  
Organic Crystals ◽  
Nonlinear Conductivity ◽  
One Dimensional

Organic Crystals, Germanates, Semiconductors

1980 ◽  
Author(s):  
L. N. Demianets ◽  
G. A. Emelchenko ◽  
J. Hesse ◽  
N. Karl ◽  
A. N. Lobachev ◽  
...  
Keyword(s):  
Organic Crystals

scholarly journals A Soft On/Off Switch Based on the Electrochemically Reversible H-J Interconversion of a Floating Porphyrin Membrane

2021 ◽  
Author(s):  
Andrés F. Molina-Osorio ◽  
Sho Yamamoto ◽  
Iván Robayo-Molina ◽  
Alonso Gamero-Quijano ◽  
Hirohisa Nagatani ◽  
...  
Keyword(s):  
Molecular Assemblies ◽  
External Stimuli

Soft molecular assemblies that respond reversibly to external stimuli are attractive materials as on/off switches, in optoelectronic, memory and sensor technologies. In this Edge Article, we present the reversible structural...

scholarly journals An octanol hinge opens the door to water transport

2021 ◽  
Author(s):  
Zhu Liu ◽  
Aurora E. Clark
Keyword(s):  
Water Transport ◽  
Phase Boundaries ◽  
Molecular Assemblies

Despite their pharmacological relevance, the mechanism of transport across water/octanol phase boundaries has remained unexplored. Octanol molecular assemblies are demonstrated to reversibly bind water and swing like the hinge of a door.

A chiral–racemic lyotropic chromonic liquid crystal system

Soft Matter ◽  
2021 ◽  
Author(s):  
Jordan K. Ando ◽  
Peter J. Collings
Keyword(s):  
Liquid Crystal ◽  
Optical Microscopy ◽  
Orientational Order ◽  
Molecular Assemblies ◽  
Polarized Optical Microscopy ◽  
Crystal System ◽  
System P ◽  
Liquid Crystal System

A lyotropic chromonic liquid crystal consists of oriented molecular assemblies in solution. If the molecules are chiral, the helical pattern of orientational order is revealed by the stripes seen with polarized optical microscopy.

Shining Light on Growth-Dependent Surface Chemistry of Organic Crystals: A Polarized Raman Spectroscopic and Computational Study of Aspirin

2019 ◽  
Vol 19 (2) ◽  
pp. 1288-1298 ◽  
Author(s):  
Anuradha R. Pallipurath ◽  
Jonathan M. Skelton ◽  
Andrea Erxleben ◽  
Patrick McArdle
Keyword(s):  
Surface Chemistry ◽  
Computational Study ◽  
Organic Crystals ◽  
Raman Spectroscopic ◽  
Polarized Raman
Sign in / Sign up

Export Citation Format

Share Document