Ultraviolet stabilizers of the 2-(hydroxyphenyl)benzotriazole class: influence of substituents on structure and spectra

Pronounced Conformational Preference of the 3?-?-Cumyl Substituent in 2-(2?-Methoxy-3?-?-Cumylphenyl)benzotriazole

“…In contrast, calculations on the methyl ether 2-(2Ј-methoxyphenyl)benzotriazole revealed that the relative energies of the three lowest energy conformers (as determined by ab initio calculations) were poorly reproduced. Therefore, we used a combination of solid-state x-ray diffraction data 4 and ab initio calculations (using Spartan 5 software) to determine higher quality molecular mechanical parameters for the system. The ab initio calculations were performed on the unsubstituted 2-(2Ј-methoxyphenyl)benzotriazole.…”

2‐Acetylindan‐1,3‐dione and its Cu2+ and Zn2+ complexes as promising sunscreen agents

“…Extensive studies on photochemical and photophysical properties of molecules showing excited state intramolecular proton transfer (ESIPT), such as o ‐hydroxybenzophenones [8–11], methylsalicylates [12–17], 2‐(2′‐hydroxyaryl)‐benzotriazoles [18–21] and 2‐(2′‐hydroxyaryl)‐1,3,5‐triazines [22, 30, 31] have been performed. It is accepted that the presence of strong intramolecular hydrogen bond (IMHB) in the compounds mentioned above ensures increased photostability.…”

Comparative investigation of the ultraviolet stabilization of polycarbonate/poly(acrylonitrile–butadiene–styrene) with different ultraviolet absorbers

“…From the literature,14 it is seen that the important step in the UV protection by a UVA is the excited‐state intramolecular proton transfer followed by radiationless deactivation processes. The structural element that is responsible for the electronic deactivation is the internal hydrogen bond.…”

“…The most important types that are commercially used are hydroxybenzophenones, hydroxyphenyl benotriazoles, cyanoacrylates, oxanilides, and more recently, commercialized hydroxylphenyl triazines. The UV absorption of these materials depends, besides on their type, on their chemical substitution 14…”