{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T12:02:09Z","timestamp":1790596929231,"version":"4.1.0"},"reference-count":29,"publisher":"AIP Publishing","issue":"12","funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP19K05362"],"award-info":[{"award-number":["JP19K05362"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP22K05016"],"award-info":[{"award-number":["JP22K05016"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP26K22762"],"award-info":[{"award-number":["JP26K22762"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,9,28]]},"abstract":"<jats:p>Langmuir monolayers of didodecylmelamine (2C12mela) on thymine aqueous solutions were studied by in situ heterodyne-detected vibrational sum frequency generation (HD-VSFG) spectroscopy. The HD-VSFG spectrum of the monolayer on a 10\u00a0mM thymine aqueous solution exhibited a positive band at 1665\u00a0cm\u22121, a negative band at 1710\u00a0cm\u22121, and an extremely broad, positive band at the low wavenumber side (2600\u20132850\u00a0cm\u22121) of the CH, NH, and OH stretching region. The three bands were assigned to the 4-carbonyl, 2-carbonyl, and strongly hydrogen-bonded NH stretching modes of thymine. The signs of the bands indicate that thymine molecules were oriented with the oxygen atoms of the 4-carbonyl pointing downward, the oxygen atoms of the 2-carbonyl pointing upward, and the hydrogen atoms of the NH groups of thymine pointing upward along the interface normal, respectively. The spectral data, supported by finite-cluster spectral simulations, favor a polymer-like supramolecular structure over trimeric models. In this model, thymine molecules are bound to neighboring 2C12mela molecules in an \u223c1:1 arrangement, with their methyl groups pointing downward along the interface normal and their 4-carbonyl groups sharing a common lateral orientation along the supramolecular chain.<\/jats:p>","DOI":"10.1063\/5.0350367","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T11:32:40Z","timestamp":1790595160000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Hydrogen-bonded supramolecular assembly of didodecylmelamine and thymine at the air\/water interface studied by heterodyne-detected vibrational sum frequency generation"],"prefix":"10.1063","volume":"165","author":[{"given":"Shuhei","family":"Yamada","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2445-2955","authenticated-orcid":false,"given":"Katsuhiko","family":"Ariga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0000-547X","authenticated-orcid":false,"given":"Taka-aki","family":"Ishibashi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"issue":"36","key":"2026092807323921200_c1","doi-asserted-by":"publisher","first-page":"8524","DOI":"10.1021\/ja960991+","volume":"118","year":"1996","journal-title":"J.\u00a0Am. 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