Lightfastness of Deuterated Ultraviolet Light Absorbers
| Autor: | Akira Miyazawa, Yuji Kawanishi, Taichi Abe |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Polymers and Plastics
Materials Science (miscellaneous) Analytical chemistry Quantum yield Lightfastness Molar absorptivity medicine.disease_cause Photochemistry chemistry.chemical_compound chemistry Deuterium Kinetic isotope effect Benzophenone medicine Ultraviolet light Chemical Engineering (miscellaneous) Ultraviolet General Environmental Science |
| Zdroj: | KOBUNSHI RONBUNSHU. 68:664-667 |
| ISSN: | 1881-5685 0386-2186 |
| DOI: | 10.1295/koron.68.664 |
| Popis: | We report the lightfastness of deuterated and undeuterated ultraviolet absorbers (UVAs). The durability of following species: 2-phenylpyridine (1H, 1D); 2,2′-bipyridine (2H, 2D); benzophenone (3H, 3D); phenylbenzoate (4H, 4D); 2-(2-benzotriazolyl)-p-cresol (5H, 5D) has been evaluated under UV light (254 or 355 nm) irradiation by means of UV-vis photoabsorption spectrometry. While all these compounds show a low photoreaction quantum yield (10−6 to 10−4), each deuterium labeled substance has a 1.2-1.5 times longer lifetime compared to the unlabeled one. Lightfastness of UVAs can be increased by deuteration through a positive isotope effect without changing its photo absorption wavelength and molecular extinction coefficient. |
| Databáze: | OpenAIRE |
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