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Olga I. Tarzi, Luciano Di Stéfano, Juan E. Argüello, Gabriela Oksdath-Mansilla and Rosa Erra-Balsells Photochemical and Thermal Stability of Some Dihydroxyacetophenones Used as UV-MALDI-MS Matrices Photochemistry and Photobiology 89

Article first published online: 17 AUG 2013 | DOI: 10.1111/php.12130

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2,4-, 2,5-, 2,6- and 3,5-dihydroxyacetophenone (DHA) used as matrices in matrix-assisted ultraviolet laser desorption/ionization mass spectrometry (UV-MALDI-MS) were studied by steady-state and transient-absorption spectroscopy, together with DFT calculations at the B3LYP level of theory. All compounds have low fluorescence quantum yields, possibly due to an efficient excited-state intramolecular proton transfer (ESIPT). Laser flash photolysis (LFP) results showed for 2,4-DHA a phototautomer detected at λ = 400 nm. Their photochemical stability in solution at different wavelengths and conditions was analyzed by different techniques. Only 3,5-DHA showed decomposition when irradiated, probably because phototautomerization is not possible.

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