Dynamic Vapochromic Behaviors of Organic Crystals Based on the Open-Close Motions of S-Shaped Donor-Acceptor Folding Units

2010 ◽  
Vol 16 (16) ◽  
pp. 4793-4802 ◽  
Author(s):  
Eiji Takahashi ◽  
Hikaru Takaya ◽  
Takeshi Naota
Keyword(s):  
Organic Crystals ◽  
Donor Acceptor

Fused, Three-Ring Donor-Acceptor Molecules as Potential Materials for Efficient Second Harmonic Generation

1989 ◽  
Vol 173 ◽  
Author(s):  
Malcolm R. McLean ◽  
Mamoun Badr ◽  
Larry R. Dalton ◽  
Robert L. S. Devine ◽  
William H. Steier
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Crystal Habit ◽  
Organic Crystals ◽  
X Ray Diffraction ◽  
Ring Compounds ◽  
Donor Acceptor ◽  
Linear Optical Properties ◽  
Corona Poling

ABSTRACTA series of fused three-ring compounds have been synthesized and characterized for their possible use as organic crystals for second-harmonic generation. Polymer films doped with these compounds were aligned via corona poling and their second order non-linear optical properties compared with layers doped with stilbene like molecules. Values of ¼β0 have been obtained and the effects of different heteroatoms and substituents on λ max and on ¼β0 were examined. An X-ray diffraction crystal structure on one member of the series, 1,2,4-Trichloro-8-nitro-phenoxazin-3-one (Compound 1), revealed a centrosymmetric crystal habit in a P21/n space group, with a = 9.829(3), b = 8.300(2) and c = 15.542(4) Å. Final R(F) = 0.0939 for 754 reflections where I σ; 3σ(I).

scholarly journals Multi-color mechanochromic luminescence of three polymorphic crystals of a donor–acceptor-type benzothiadiazole derivative

CrystEngComm ◽  
2021 ◽  
Author(s):  
Suguru Ito ◽  
Sayaka Nagai ◽  
Takashi Ubukata ◽  
Takashi Tachikawa
Keyword(s):  
Color Change ◽  
Mechanical Force ◽  
Organic Crystals ◽  
The Past ◽  
Polymorphic Crystals ◽  
Donor Acceptor ◽  
Mechanochromic Luminescence

The past decade has witnessed rapid advances in the development of organic crystals that exhibit mechanochromic luminescence (MCL), i.e., the reversible color change of photoluminescence induced by mechanical force. However,...

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.

Evidence of a donor-acceptor type transition in CuGaSe2

1980 ◽  
Vol 41 (7) ◽  
pp. 707-712 ◽  
Author(s):  
A. Poure ◽  
G. Aguero ◽  
G. Masse ◽  
J.P. Aicardi
Keyword(s):  
Type Transition ◽  
Donor Acceptor

Photoactive donor-acceptor thin films as prospective materials for evaporated bulk heterojunctions of molecular semiconductors

2008 ◽  
Author(s):  
Derck Schlettwein ◽  
Robin Knecht ◽  
Dominik Klaus ◽  
Christopher Keil ◽  
Günter Schnurpfeil
Keyword(s):  
Thin Films ◽  
Bulk Heterojunctions ◽  
Donor Acceptor ◽  
Molecular Semiconductors
Sign in / Sign up

Export Citation Format

Share Document