{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T02:36:45Z","timestamp":1791945405102,"version":"4.3.4"},"reference-count":104,"publisher":"AIP Publishing","issue":"5","license":[{"start":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T00:00:00Z","timestamp":1738800000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T00:00:00Z","timestamp":1738800000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100024870","name":"Exacte en Natuurwetenschappen","doi-asserted-by":"publisher","award":["OCENW.Klein.356"],"award-info":[{"award-number":["OCENW.Klein.356"]}],"id":[{"id":"10.13039\/501100024870","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2025,2,7]]},"abstract":"<jats:p>Self-assembling amphiphilic cyanine dyes, such as C8S3, are promising candidates for energy storage and optoelectronic applications due to their efficient energy transport properties. C8S3 is known to self-assemble in water into double-walled J-aggregates. Thus far, the molecular self-assembly steps remain shrouded in mystery. Here, we employ a multiscale approach to unravel the first self-assembly step: dimerization. Our multiscale approach combines molecular dynamics simulations with quantum chemistry calculations to obtain a Frenkel exciton Hamiltonian, which we then use in spectral calculations to determine the absorption and two-dimensional electronic spectra of C8S3 monomer and dimer systems. We model these systems solvated in both water and methanol, validating our model with experiments in methanol solution. Our theoretical results predict a measurable anisotropy decay upon dimerization, which is experimentally confirmed. Our approach provides a tool for the experimental probing of dimerization. Moreover, molecular dynamics simulations reveal that the dimer conformation is characterized by the interaction between the hydrophobic aliphatic tails rather than the \u03c0\u2013\u03c0 stacking previously reported for other cyanine dyes. Our results pave the way for future research into the mechanism of molecular self-assembly in similar light-harvesting complexes, offering valuable insights for understanding and optimizing self-assembly processes for various (nano)technological applications.<\/jats:p>","DOI":"10.1063\/5.0237531","type":"journal-article","created":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T11:16:37Z","timestamp":1738840597000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["The first step of cyanine dye self-assembly: Dimerization"],"prefix":"10.1063","volume":"162","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3927-0713","authenticated-orcid":false,"given":"M\u00f3nica K.","family":"Espinoza Cangahuala","sequence":"first","affiliation":[{"name":"University of Groningen, Zernike Institute for Advanced Materials , Nijenborgh 3, 9747 AG Groningen,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9922-0860","authenticated-orcid":false,"given":"Sundar Raj","family":"Krishnaswamy","sequence":"additional","affiliation":[{"name":"University of Groningen, Zernike Institute for Advanced Materials , Nijenborgh 3, 9747 AG Groningen,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0431-6523","authenticated-orcid":false,"given":"Alexey V.","family":"Kuevda","sequence":"additional","affiliation":[{"name":"University of Groningen, Zernike Institute for Advanced Materials , Nijenborgh 3, 9747 AG Groningen,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5446-4287","authenticated-orcid":false,"given":"Maxim S.","family":"Pshenichnikov","sequence":"additional","affiliation":[{"name":"University of Groningen, Zernike Institute for Advanced Materials , Nijenborgh 3, 9747 AG Groningen,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6066-6080","authenticated-orcid":false,"given":"Thomas L. 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