60-09-3Relevant articles and documents
Solvent effects and energy transfer processes in luminescent composite
Menandro, Alessandra S.,Oliveira, Hueder P. M.,Péres, Laura O.,Siqueira, Leonardo J. A.
, (2020)
The combination of conjugated polymers and photochromic molecules can result in a composite, which can yield a new photoresponsive material. The efficiency of these materials is due to the process of energy transfer. In this work, the conjugated polymer poly (3-hexylthiophene-co-1,4-phenylene) (PTPh) was synthesized by Suzuki route and the photochromic molecule 4-aminoazobenzene (Azo), synthesized by diazonium salt coupling, were mixed forming a luminescent composite. This new material was obtained in four different solvents, in order to evaluate its influence. When the Azo is added in a solution of PTPh, it was observed a decrease of the emission spectra of the copolymer, indicating the suppression of PTPh due to F?ster's energy transfer from PTPh to Azo. The larger energy transfer has been found in ethanol. Density Functional Theory (DFT) calculations have been performed for Azo, an oligomeric model for the PTPh and a complex formed by the Azo and the oligomeric model for PTPh, with two different functionals. Computational results indicate the occurrence of C-H---π and N-H---S interactions in the optimized structure of PTPh/Azo complex. The LUMO orbital of the PTPh/Azo complex is mainly located in the Azo moiety, suggesting that Azo might receive energy from the polymer. Therefore, the joint computational-experimental study enables the understanding of the energy transfer that takes place in the PTPh/Azo systems.
Synthesis and experimental investigations on the photoconductivity of p-aminoazobenzene based non-conjugated polybenzoxazine system
Pillai, Jisha J.,Abbas, Anshad,Narayanan, Sona,Sreekumar,Kartha, C. Sudha,Joseph, Rani
, p. 330 - 337 (2018)
In this paper, we report the study of a novel p-aminoazobenzene based non-conjugated, benzoxazine polymer, poly([4-(6-tert-butyl-4H-benzo[e][1,3]oxazin-3-yl)phenyl]-phenyldiazene) (AZO-PBZ) synthesized using solvent free, thermally activated cationic ring opening polymerization. The thermal, photophysical, electrochemical, and photoconducting properties of the polymer were investigated. The optical absorption band edges of AZO-PBZ thin film was observed at 555 nm. Photoinduced charge transfer nature of AZO-PBZ was studied by analyzing the fluorescence spectra and performing photoconductivity experiments. Incorporation of [6, 6]-phenyl-C61-butyric acid methyl ester denoted as PCBM into the polymer leads to quenching of the fluorescent intensity and exhibits significant photoconductivity. The photocurrent through the PCBM blend films was measured as a function of electric field to recognize the field dependence on carrier generation. Internal photocurrent efficiency of the polymer:PCBM blend samples was found to be in the order of 10?5 and photoconductive sensitivity was of the order of 10?11 S W?1cm, which is adequate for photorefractivity.
Calculated oxidation potentials predict reactivity in Baeyer-Mills reactions
Gingrich, Phillip W.,Olson, David E.,Tantillo, Dean J.,Tombari, Robert J.,Tuck, Jeremy R.,Yardeny, Noah
supporting information, p. 7575 - 7580 (2021/09/22)
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 due to the formation of undesired azoxybenzene. Here, we explore electronic effects dictating the formation of the azoxybenzene side-product. Using calculated oxidation potentials, we were able to predict reaction outcomes and improve reaction efficiency simply by modulating the oxidation potential of the arylamine component.
Cannabinoid receptor light-operated ligand and preparation method and application thereof
-
Paragraph 0066; 0073; 0106-0112, (2021/01/24)
The invention relates to the technical field of biology, in particular to a novel cannabinoid receptor light-operated ligand and a preparation method and application thereof. Disclosed is the cannabinoid receptor light-operated ligand or the isomer prodrug, the solvate and the pharmaceutically acceptable salt of the cannabinoid receptor light-operated ligand, wherein the structural formula of thecannabinoid receptor light-operated ligand is A-linker-B; A is a transmembrane domain ligand structure, and B is a light-operated element; Linker is a subunit which is linear and has no activity on acannabinoid receptor light-operated ligand. According to the invention, the cannabinoid receptor ligand is integrated with azobenzene through a proper connector, so that the ligand configuration is changed under an illumination condition, and the activation or inhibition state of the cannabinoid receptor is regulated and controlled.
Azo aryl urea derivative, and preparation method and application thereof
-
, (2020/06/17)
The invention relates to an azo aryl urea derivative, and a preparation and an application thereof, and concretely discloses a compound represented by formula (I), or an optical isomer, a cis-trans-isomer or a pharmaceutically acceptable salt thereof, and a preparation method thereof. Definitions of substituent groups in the general formula are described in the specification and claims. The invention further discloses a composition containing the above compound, and an application thereof. The compound has excellent anticancer activity on HepG2 liver cancer cells, MGC803 gastric cancer cells,HCT116 colon cancer and the like.