{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T06:26:35Z","timestamp":1773037595474,"version":"3.50.1"},"reference-count":63,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemPhysChem"],"published-print":{"date-parts":[[2026,2,25]]},"abstract":"<jats:p>Benzazole derivatives exhibit distinctive photophysical behavior due to excited\u2010state intramolecular proton transfer (ESIPT), making them promising candidates for optoelectronic applications such as organic light\u2010emitting diodes (OLEDs) and fluorescent sensors. Understanding their sublimation energetics, phase behavior, and emissive properties is essential for both fundamental studies and materials design. This article reports an investigation on two benzazole derivatives\u20142\u2010(2\u2010hydroxyphenyl)benzothiazole and 2\u2010(2\u2010hydroxyphenyl)benzoxazole (HBO)\u2014through studies of thermal analysis, vapor pressure measurements, and fluorescence spectroscopy to establish structure\u2013property relationships. Thermal stability and phase transitions are characterized using simultaneous thermogravimetry\u2010differential scanning calorimetry (TG\u2010DSC) and heat\u2010flux DSC. Vapor pressures are determined using both Knudsen effusion mass loss and mass spectrometry. The derived standard molar enthalpies of sublimation, vaporization, and fusion highlight the presence of heteroatom (S versus O) on intermolecular interactions. Solid\u2010state fluorescence measurements reveal strong emission in both compounds, with a large Stokes shift\u2014consistent with ESIPT\u2014and complex spectra attributed to solid\u2010state molecular packing. This comprehensive experimental strategy delivers benchmark thermodynamic and photophysical data, offering new insights into the interplay between molecular structure, thermal behavior, and fluorescence of benzazole derivatives. Such understanding is relevant for the development of advanced optoelectronic materials.<\/jats:p>","DOI":"10.1002\/cphc.202500570","type":"journal-article","created":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T22:53:43Z","timestamp":1765666423000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["On the Vapor Pressures, Phase Transitions, and Solid\u2010State Fluorescence of 2\u2010(2\u2010Hydroxyphenyl)benzoxazole and 2\u2010(2\u2010Hydroxyphenyl)benzothiazole"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1360-5327","authenticated-orcid":false,"given":"Jos\u00e9 M.","family":"Silva Ferraz","sequence":"first","affiliation":[{"name":"Department of Basic and Applied Sciences for Engineering Sapienza University of Rome  Via del Castro Laurenziano 7 00161 Rome Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4839-8279","authenticated-orcid":false,"given":"Ana L. 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