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Nitroaniline

About: Nitroaniline is a research topic. Over the lifetime, 551 publications have been published within this topic receiving 9251 citations.


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TL;DR: In this paper, the second and third order hyperpolarizabilities of the three nitroaniline isomers and of two related molecules were measured and a theory relating this contribution to the first excited state of energy, oscillator strength, and dipole moment of the molecules was presented.
Abstract: We have measured the second and third order hyperpolarizabilities of the three nitroaniline isomers and of two related molecules. For some isomers the intramolecular charge transfer is found to cause a very large enhancement of the second order polarizabilities. We present a theory relating this contribution to the first excited state of energy, oscillator strength, and dipole moment of the molecules. Experimental results are accounted for with an excellent accuracy.

2,026 citations

Journal ArticleDOI
TL;DR: Low-energy metal-to-ligand charge-transfer excitations are associated with the very large molecular nonlinear optical (NLO) coefficients, β, of the complexes [RuII (NH3 )5 (N-R-4,4'-bipyridinium)]3+ (R=methyl, phenyl, or 4-acetylphenyl).
Abstract: Low-energy metal-to-ligand charge-transfer (MLCT) excitations are associated with the very large molecular nonlinear optical (NLO) coefficients, β, of the complexes [RuII(NH3)5(N-R-4,4′-bipyridinium)]3+ (R=methyl, phenyl, or 4-acetylphenyl). Chemical oxidation to the RuIII forms causes bleaching of the MLCT absorptions and marked attenuation of the NLO responses. Both effects are completely reversed upon re-reduction, and the extent of the β switching is about 10- to 20-fold.

263 citations

Journal ArticleDOI
TL;DR: The ultrafast ultrafast relaxation of p -nitroaniline (PNA) in water and acetonitrile is studied experimentally and theoretically in this article, where transient absorption spectra are measured by the pump-supercontinuum probe technique (PSCP) after 50 fs excitation at 400 nm.

175 citations

Journal ArticleDOI
TL;DR: Aniline black coatings were obtained on Fe anodes by electrolyzing a basic solution of aniline in a water-methanol medium as mentioned in this paper, and they may be polymerized to adherent films in the presence of both allylamine and K2CrO4.
Abstract: Aniline Black coatings were obtained on Fe anodes by electrolyzing a basic solution of aniline in a water—methanol medium. Allylamine (an inhibitor of Fe corrosion), although not essential to the process, imparts better efficiency to it. The deposited polymers contain 15–20% azobenzene and exhibit semiconductor properties. The three nitroaniline isomers need a more efficient corrosion-inhibition system. They may be polymerized to adherent films in the presence of both allylamine and K2CrO4.

174 citations

Journal ArticleDOI
TL;DR: The first photoluminescent Cd(II)-organic framework based on a multi-functional ligand, 2-amino-5-sulfobenzoic acid (H25-asba), has been successfully constructed in this article.
Abstract: The first photoluminescent Cd(II)–organic framework {[Cd(5-asba)(bimb)]}n (1) based on a multi-functional ligand, 2-amino-5-sulfobenzoic acid (H25-asba), has been successfully constructed. The structure of 1 was determined by single crystal X-ray diffraction analysis, revealing that 1 exhibits a six-connected α-polonium network with a Schlafli symbol of 412·63. The phase purity of the bulk sample of 1 was further confirmed by elemental analysis and powder X-ray diffraction pattern (PXRD) which was consistent with the simulated phase purity calculated from single crystal X-ray diffraction data. The optical property of 1 was characterized by analysis of the solid state UV-vis diffuse reflectance spectrum, indicating that 1 may be a potential candidate for wide gap semiconductor materials. The photoluminescence properties of 1 well dispersed in various solvents have been investigated in detail, indicating that 1 shows distinct solvent-dependent photoluminescence. 1 belongs to the rare category of MOFs that exhibit multi-responsive photoluminescence sensing properties. It can be used as a rapid and efficient selective fluorescent sensor for Fe3+ ions in environmental and biological systems at about a one ppm level. For the photoluminescence responses of 1 dispersed in aqueous solution with incrementally increased 4-nitroaniline (4-NA) and 2-methyl-4-nitroaniline (2-M-4-NA) concentrations, photoluminescence quenching was detectable even at a very low concentration of 0.52 ppm for 4-NA and 0.68 ppm for 2-M-4-NA, indicating that 1 exhibits extremely high sensitivities for 4-NA and 2-M-4-NA. A further systematic study reveals that 1 shows more efficient sensing of nitroaniline homologues (4-NA and 2-M-4-NA) over other electron-deficient nitroaromatic compounds (NACs). 1 represents the first case of a MOF-based photoluminescent probe for 4-NA and 2-M-4-NA. Furthermore, 1 can discriminate the nitrophenol isomers (2-, 3- and 4-NP) through fluorescence sensing. To our best knowledge, 1 is the first Cd(II) MOF based on the multi-functional ligand H25-asba that can be used as a multi-responsive efficient sensory material for Fe3+ ions and some NACs, especially for nitroaniline homologues (4-NA and 2-M-4-NA).

118 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202311
202211
202116
202015
201917
201818