The fundamental vibrational modes of a series of six halophthalonitriles have been studied using Raman and infrared spectroscopy. The vibrational assignment of experimental wave numbers obtained from solid samples was aided using quantum chemical computations. Semi-empirical methods and the local SVWN functional were used to obtain vibrational wave numbers and atomic displacement representations of the fundamental molecular vibrations. The study of a series of molecules with similar structure permits the identification of characteristic wave numbers and the effect of the halosubstitution in the molecular structure. (C) 1998 Elsevier Science B.V. All rights reserved.
[EN] SINGLE-STEP PROCESS FOR THE PREPARATION OF ARYL OLEFINS<br/>[FR] PROCÉDÉ EN UNE ÉTAPE POUR LA PRÉPARATION D'ARYLOLÉFINES
申请人:COUNCIL SCIENT IND RES
公开号:WO2014073003A1
公开(公告)日:2014-05-15
The present invention relates to the single-step process for the synthesis of aryl olefin compounds of Formula (1) by reacting aryl aldehydes with alkyl aldehydes in presence of malononitrile and acid or base or salt, optionally in presence of solvent.
Presence and Absence of Excited State Intramolecular Charge Transfer with the Six Isomers of Dicyano-<i>N</i>,<i>N</i>-dimethylaniline and Dicyano-(<i>N</i>-methyl-<i>N</i>-isopropyl)aniline
作者:Victor A. Galievsky、Sergey I. Druzhinin、Attila Demeter、Sergey A. Kovalenko、Tamara Senyushkina、Peter Mayer、Klaas A. Zachariasse
DOI:10.1021/jp2045614
日期:2011.10.13
occurs with 25DCMIA, notwithstanding its large ΔE(S1,S2), is due to the substantial amino twist angle θ = 42.6°, which leads to partial electronic decoupling of the D and A subgroups. The dipole moments μe(ICT) range between 18 D for 34DCMIA and 12 D for 25DCMIA, larger than the corresponding μe(LE) of 16 and 11 D. The difference between μe(ICT) and μe(LE) is smaller than with DMABN (17 and 10 D) because
Electrooptic chromophores with large optical birefringence for applications at high speed and short wavelengths
申请人:McGinniss D. Vincent
公开号:US20060106262A1
公开(公告)日:2006-05-18
Disclosed is a series of materials, which exhibit large birefringence under the influence of an applied electric field. These materials are capable of switching this large birefringence with a characteristic time on the order of 1 microsecond or less. In addition, these materials have good optical loss at this wavelength, and are stable under irradiation. These materials are suitable for fabrication of optical devices such a variable optical attenuators, switches, and modulators that respond in these time frames or slower. These materials are also suitable for use across a wide range of wavelengths. As a second component of this invention, some of these novel materials exhibit these desired optical properties (large birefringence, low loss, stability under illumination) at wavelengths as short as about 400 nm. These materials are suitable for fabrication of optical devices operating at or about 405 nm, where conventional EO materials strongly absorb and/or quickly degrade.