scholarly journals Photocyclization of diarylethenes: the effect of imidazole on the oxidative photodegradation process

2019 ◽  
Vol 18 (5) ◽  
pp. 1101-1109 ◽  
Author(s):  
A. V. Zakharov ◽  
A. G. Lvov ◽  
I. A. Rostovtseva ◽  
A. V. Metelitsa ◽  
A. V. Chernyshev ◽  
...  
Keyword(s):  
Photochromic Compounds ◽  
Side Process

It was found that imidazole prevents the side process of diarylethenes photocyclization and the photodegradation of photochromic compounds.

Thermally irreversible organic photochromic compounds for optical memory

2007 ◽  
Vol 20 (11) ◽  
pp. 1007-1020 ◽  
Author(s):  
V. A. Barachevsky ◽  
Yu. P. Strokach ◽  
Yu. A. Puankov ◽  
M. M. Krayushkin
Keyword(s):  
Optical Memory ◽  
Photochromic Compounds ◽  
Organic Photochromic Compounds

Dealkylation of N-substituted indolinospironaphthoxazine photochromic compounds under UV irradiation

1994 ◽  
Vol 83 (2) ◽  
pp. 147-151 ◽  
Author(s):  
G. Baillet ◽  
M. Campredon ◽  
R. Guglielmetti ◽  
G. Giusti ◽  
C. Aubert
Keyword(s):  
Uv Irradiation ◽  
Photochromic Compounds

NEW ACIDO- AND PHOTOSWITCHABLE CHROMOPHORES FOR SECOND-ORDER NONLINEAR OPTICS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 423-426 ◽  
Author(s):  
L. SANGUINET ◽  
S. AHMED ◽  
J. L. POZZO ◽  
V. RODRIGUEZ ◽  
F. ADAMIETZ
Keyword(s):  
Optical Properties ◽  
Nonlinear Optics ◽  
Nonlinear Optical ◽  
Rayleigh Scattering ◽  
Second Order ◽  
Nonlinear Optical Properties ◽  
Photochromic Compounds ◽  
The Way

New acidochromic and photochromic compounds with nonlinear optical properties have been designed and synthesized. The hyperpolarizabilities of the zwitterionic colored forms have been quantified with polarized hyper-Rayleigh scattering experiments. The static value of oxazolidino-indoline 2 is found to be as high as Disperse Red One. This opens the way to novel multi-addressable NLO-systems.

Research on Photochromic Compounds with Synthesis and Properties of a Novel Unsymmetrical Diarylethene with a Benzothiophene and a Pyrrole Group

2014 ◽  
Vol 1003 ◽  
pp. 23-26
Author(s):  
Hong Jing Jia ◽  
Ying Long Fu ◽  
Cong Bin Fan
Keyword(s):  
Thermal Stability ◽  
Potential Application ◽  
Uv Light ◽  
Optical Storage ◽  
Pmma Film ◽  
Good Thermal Stability ◽  
Photochromic Compounds ◽  
Storage Technology ◽  
Hexane Solution

A new unsymmetrical photochromic diarylethene1o, which is named [1-(2-methyl-benzothiophene)-2-(2-cyano-1,5-dimethyl-4-pyrryl)]perfluorocyclopentene, was synthesized. We used it to accomplish recording by optical storage technology as memory medium. Then its photochromic both in hexane solution and in PMMA film and kinetics experiment were investigated in detail. The result indicated that this diarylethene had good thermal stability and exhibited reversible photochromism, changing the color from colorless to violet in hexane solution upon appropriate irradiation with 297 nm UV light, respectively. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. The results demonstrated that the unsymmetrical diarylethene compound1o, which we have synthesized, had attractive properties for potential application in optical storage.

scholarly journals Fluorescence modulation of cadmium sulfide quantum dots by azobenzene photochromic switches

2016 ◽  
Vol 472 (2186) ◽  
pp. 20150692 ◽  
Author(s):  
Hina Javed ◽  
Kalsoom Fatima ◽  
Zareen Akhter ◽  
Muhammad Arif Nadeem ◽  
Muhammad Siddiq ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Mercaptoacetic Acid ◽  
X Ray Diffraction ◽  
Photochromic Compounds ◽  
Lowest Unoccupied Molecular Orbital ◽  
Modified Surface ◽  
Fluorescence Modulation ◽  
Cds Qds ◽  
Surface Modified

We have investigated the attachment of azobenzene photochromic switches on the modified surface of cadmium sulfide (CdS) quantum dots (QDs). The modification of CdS QDs is done by varying the concentration of the capping agent (mercaptoacetic acid) and NH 3 in order to control the size of the QDs. The X-ray diffraction studies revealed that the crystallite size of CdS QDs ranged from 6 to 10 nm. The azobenzene photochromic derivatives bis(4-hydroxybenzene-1-azo)4,4′(1,1′ diphenylmethane) (I) and 4,4′-diazenyldibenzoic acid (II) were synthesized and attached with surface-modified CdS QDs to make fluorophore–photochrome CdS-(I) and CdS-(II) dyad assemblies. Upon UV irradiation, the photochromic compounds (I) and (II) undergo a reversible trans – cis isomerization. The photo-induced trans – cis transformation helps to transfer photo-excited electrons from the conduction band of the CdS QDs to the lowest unoccupied molecular orbital of cis isomer of photochromic compounds (I) and (II). As a result, the fluorescence of CdS-(I) and CdS-(II) dyads is suppressed approximately five times compared to bare CdS QDs. The fluorescence modulation in such systems could help to design luminescent probes for bioimaging applications.

Calculated Oxidation Potentials Predict Reactivity in Baeyer-Mills Reactions

2021 ◽  
Author(s):  
Robert J. Tombari ◽  
Jeremy Ryan Tuck ◽  
Noah Yardeny ◽  
Phillip W. Gingrich ◽  
Dean J Tantillo ◽  
...  
Keyword(s):  
Common Method ◽  
Photochromic Compounds ◽  
Oxidation Potentials

Azobenzenes are widely used as dyes and photochromic compounds, with the Baeyer-Mills reaction serving as the most common method for their preparation. This transformation is often plagued by low yields...

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