{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:09:57Z","timestamp":1760058597499,"version":"build-2065373602"},"reference-count":48,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,4,8]],"date-time":"2025-04-08T00:00:00Z","timestamp":1744070400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The polymorphism of the ultraviolet luminescent security ink Orlyum White 520T (N-(2-(4-oxo-4H-benzo[d][3,1]-oxazin-2-yl)phenyl)naphthalene-2-sulfonamide) is revealed, obtaining two new polymorphic forms with enhanced stability. Beyond the known form (lit. mp. 184.8\u2013185.2 \u00b0C, Form III, YOCTAO), we succeeded in gaining two new polymorphic forms, Form II and Form I, with higher melting points of 195\u2013196 and 197\u2013198 \u00b0C, respectively. Their elemental composition, 1H and 13C NMR spectra have been found to be identical, while their powder XRD patterns and FT-IR spectra are significantly different. Based on the single-crystal structure determination of Form II and redetermination of Form III, we uncover the similarities and differences in their packing arrangement and in their secondary interaction systems, all of which affect the molecular conformations in their crystals. In order to explain their significantly distinguishable melting points, Hirshfeld surface analysis and lattice energy calculations have also been carried out. We have made efforts toward revealing the reproducible conditions under which certain polymorphs are formed. It seems that the solvents or other probable organic contaminations are more likely responsible for the formation, nucleation and growth of crystals of various polymorphic forms, traced by thermogravimetric evolved gas analysis (TG\/DTA-EGA-MS).<\/jats:p>","DOI":"10.3390\/molecules30081671","type":"journal-article","created":{"date-parts":[[2025,4,9]],"date-time":"2025-04-09T03:32:53Z","timestamp":1744169573000},"page":"1671","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Polymorphism of Orlyum White 520T, an Ultraviolet Luminescent Security Ink"],"prefix":"10.3390","volume":"30","author":[{"given":"J\u00e1nos","family":"Madar\u00e1sz","sequence":"first","affiliation":[{"name":"Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, M\u0171egyetem rkp. 3, HU-1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4770-4681","authenticated-orcid":false,"given":"N\u00f3ra V.","family":"May","sequence":"additional","affiliation":[{"name":"Centre for Structural Science, HUN-REN Research Centre for Natural Sciences, Magyar Tud\u00f3sok K\u00f6r\u00fatja 2, HU-1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5509-1515","authenticated-orcid":false,"given":"Petra","family":"Bombicz","sequence":"additional","affiliation":[{"name":"Centre for Structural Science, HUN-REN Research Centre for Natural Sciences, Magyar Tud\u00f3sok K\u00f6r\u00fatja 2, HU-1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gy\u00f6rgy","family":"Pokol","sequence":"additional","affiliation":[{"name":"Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, M\u0171egyetem rkp. 3, HU-1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rich\u00e1rd","family":"Kocsis","sequence":"additional","affiliation":[{"name":"LuminoChem R&D Ltd., H\u00e1ros utca 7\/A, HU-1222 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B\u00e1lint","family":"Hegymegi-Barakonyi","sequence":"additional","affiliation":[{"name":"LuminoChem R&D Ltd., H\u00e1ros utca 7\/A, HU-1222 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tibor","family":"Gizur","sequence":"additional","affiliation":[{"name":"Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, M\u0171egyetem rkp. 3, HU-1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,8]]},"reference":[{"key":"ref_1","unstructured":"CAS SciFinder(n) (2024, August 15). 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