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The study focused on the following positional isomers: 2\u2010hydroxy\u20103\u2010nitrobenzoic acid, 2\u2010hydroxy\u20104\u2010nitrobenzoic acid, 2\u2010hydroxy\u20105\u2010nitrobenzoic acid, 3\u2010hydroxy\u20102\u2010nitrobenzoic acid, 3\u2010hydroxy\u20104\u2010nitrobenzoic\u00a0acid, 3\u2010hydroxy\u20105\u2010nitrobenzoic acid, 4\u2010hydroxy\u20103\u2010nitrobenzoic acid, and 5\u2010hydroxy\u20102\u2010nitrobenzoic acid. Most isomers exhibited strong solid\u2010state absorption at the excitation wavelengths commonly used in UV\u2010MALDI technique (&gt;90% at 337 and 355\u2009nm), high photostability, no detectable luminescence, and highly efficient excitation energy dissipation as prompt heat, resembling the behavior of calorimetric references under both N\n                    <jats:sub>2<\/jats:sub>\n                    \u2010 and air\u2010saturated conditions, suggesting a potential role in facilitating desorption\/ionization processes in UV\u2010MALDI. These findings provide valuable insight into the performance of HNBAs as matrix candidates.\n                  <\/jats:p>","DOI":"10.1111\/php.70070","type":"journal-article","created":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T07:57:22Z","timestamp":1767686242000},"page":"1169-1184","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photophysics of hydroxy\u2010nitrobenzoic acid\n                    <scp>UV<\/scp>\n                    \u2010\n                    <scp>MALDI<\/scp>\n                    matrices investigated via spectroscopic, photoacoustic, and luminescence techniques"],"prefix":"10.1111","volume":"102","author":[{"given":"Oscar E.","family":"Silva Rodriguez","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabell\u00f3n II, 3er P. 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