896-06-0Relevant articles and documents
Observation of the complex spectra for the supramolecular system involving silver nanoparticles-biaryl Schiff bases containing the nitro group
Cao, Chao-Tun,Cheng, Shi-Mao,Cao, Chenzhong
, (2020/02/11)
A series of biaryl Schiff bases containing the nitro groups, 4-XArCH═NArNO2-4′ (XBANO2-4′) and 4-NO2ArCH═NArY-4′ (4-NO2BAY), were synthesized. Also, the fish sperm DNA (fsDNA) and silver nanoparticles (AgNPs) solutions were prepared. By mixing these compounds with fsDNA or AgNPs solution and determining the ultraviolet absorption spectra of the mixture solutions, an interesting phenomenon was found: a new absorption peak λmax,lim appeared in the (XBANO2-4′)-AgNPs solution, which was longer than the wavelength of λmax of XBANO2-4′ solution. The new absorption peak in the (XBANO2-4′)-AgNPs solution was the complex spectrum originating from the electron transfer between XBANO2-4′ and AgNPs. Whereas this phenomenon was not observed in the (4-NO2BAY)-AgNPs solutions, a quantitative correlation analysis was carried out with the measured spectral data, and the results show that the wave number νmax,lim of the λmax,lim is mainly affected by the excited-state substituent constant (Formula presented.) rather than the ground Hammett constant σ of the X group. The redshift magnitude Δνmax,WSL, namely, Δνmax,WSL = (1/λmax) ? (1/λmax,lim), of the wavelength λmax,lim is related to the highest occupied molecular orbital and lowest unoccupied molecular orbital of XBANO2-4′. The discovery of this new phenomenon is helpful to understanding the interaction between AgNPs-organic compound supramolecular systems.
ELECTRONIC ABSORPTION SPECTRA OF AROMATIC SCHIFF BASES. PART III. p-PHENYLENEDIAMINE DERIVATIVES
Gawinecki, Ryszard,Muzalewski, Feliks
, p. 1091 - 1098 (2007/10/02)
The effect of para substituents in the benzylidene-p-dimethylaminoaniline and dibenzylidene-p-phenylenediamine molecules on their UV-VIS spectra has been studied.A linear relationship has been found between position of the most long-wavelength absorption
SEMICONDUCTIVITY OF ORGANIC SUBSTANCES-15
ELEY DD,NEWMAN OMG
, p. 1106 - 1112 (2007/10/05)
Part 15 treats compounds related to stilbene. Dark conductivity in diphenylbutadiene and four analogs of stilbene has been examined. The compounds were chosen to reveal the possible effects of a donor and an acceptor group attached to opposite ends of the