{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T22:07:56Z","timestamp":1776463676689,"version":"3.51.2"},"reference-count":126,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,16]],"date-time":"2023-04-16T00:00:00Z","timestamp":1681603200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"U.S. National Science Foundation (NSF)","doi-asserted-by":"publisher","award":["CHE-2003550"],"award-info":[{"award-number":["CHE-2003550"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"U.S. National Science Foundation (NSF)","doi-asserted-by":"publisher","award":["2022\u20132023"],"award-info":[{"award-number":["2022\u20132023"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Oregon State University College of Science SciRIS-ii","award":["CHE-2003550"],"award-info":[{"award-number":["CHE-2003550"]}]},{"name":"Oregon State University College of Science SciRIS-ii","award":["2022\u20132023"],"award-info":[{"award-number":["2022\u20132023"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Proton transfer processes of organic molecules are key to charge transport and photoprotection in biological systems. Among them, excited-state intramolecular proton transfer (ESIPT) reactions are characterized by quick and efficient charge transfer within a molecule, resulting in ultrafast proton motions. The ESIPT-facilitated interconversion between two tautomers (PS and PA) comprising the tree fungal pigment Draconin Red in solution was investigated using a combination of targeted femtosecond transient absorption (fs-TA) and excited-state femtosecond stimulated Raman spectroscopy (ES-FSRS) measurements. Transient intensity (population and polarizability) and frequency (structural and cooling) dynamics of \u2013COH rocking and \u2013C=C, \u2013C=O stretching modes following directed stimulation of each tautomer elucidate the excitation-dependent relaxation pathways, particularly the bidirectional ESIPT progression out of the Franck\u2013Condon region to the lower-lying excited state, of the intrinsically heterogeneous chromophore in dichloromethane solvent. A characteristic overall excited-state PS-to-PA transition on the picosecond timescale leads to a unique \u201cW\u201d-shaped excited-state Raman intensity pattern due to dynamic resonance enhancement with the Raman pump\u2013probe pulse pair. The ability to utilize quantum mechanics calculations in conjunction with steady-state electronic absorption and emission spectra to induce disparate excited-state populations in an inhomogeneous mixture of similar tautomers has broad implications for the modeling of potential energy surfaces and delineation of reaction mechanisms in naturally occurring chromophores. Such fundamental insights afforded by in-depth analysis of ultrafast spectroscopic datasets are also beneficial for future development of sustainable materials and optoelectronics.<\/jats:p>","DOI":"10.3390\/molecules28083506","type":"journal-article","created":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T02:02:59Z","timestamp":1681696979000},"page":"3506","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Photogrammetry of Ultrafast Excited-State Intramolecular Proton Transfer Pathways in the Fungal Pigment Draconin Red"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5895-5956","authenticated-orcid":false,"given":"Janak","family":"Solaris","sequence":"first","affiliation":[{"name":"Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR 97331, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taylor D.","family":"Krueger","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR 97331, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0561-5226","authenticated-orcid":false,"given":"Cheng","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR 97331, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8879-1825","authenticated-orcid":false,"given":"Chong","family":"Fang","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR 97331, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3615","DOI":"10.1002\/adma.201102046","article-title":"Advanced organic optoelectronic materials: Harnessing excited-state intramolecular proton transfer (ESIPT) process","volume":"23","author":"Kwon","year":"2011","journal-title":"Adv. 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