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Concentration\u2010 and temperature\u2010dependent UV\/Vis spectroscopy in chloroform combined with dynamic light scattering, capillary viscosimetry and atomic force microscopy investigations were applied to elucidate the mechanistic features of the self\u2010assembly of these strongly dipolar dyes. Our detailed studies reveal that the self\u2010assembly is very pronounced for bis(merocyanines) <jats:bold>1\u2009a<\/jats:bold>,<jats:bold>b<\/jats:bold> bearing linear alkyl chains, but completely absent for bis(merocyanine) <jats:bold>1\u2009c<\/jats:bold> bearing sterically more bulky ethylhexyl substituents. Both temperature\u2010 and concentration\u2010dependent UV\/Vis data provide unambiguous evidence for a cooperative self\u2010assembly process for bis(merocyanines) <jats:bold>1\u2009a<\/jats:bold>,<jats:bold>b<\/jats:bold>, which was analyzed in detail by the Meijer\u2013Schenning\u2013Van\u2010der\u2010Schoot model (applicable to temperature\u2010dependent data) and by the Goldstein\u2013Stryer model (applicable to concentration\u2010dependent data). By combining both methods all parameters of interest to understand the self\u2010assembly process could be derived, including in particular the nucleus size (8\u201310 monomeric units), the cooperativity factor (ca. 0.006), and the nucleation and elongation constants of about 10<jats:sup>3<\/jats:sup> and 10<jats:sup>6<\/jats:sup>\u2009<jats:sc>M<\/jats:sc><jats:sup>\u22121<\/jats:sup> in chloroform at room temperature, respectively.<\/jats:p>","DOI":"10.1002\/chem.201202679","type":"journal-article","created":{"date-parts":[[2012,11,21]],"date-time":"2012-11-21T02:51:28Z","timestamp":1353466288000},"page":"206-217","source":"Crossref","is-referenced-by-count":65,"title":["Cooperative Supramolecular Polymerization: Comparison of Different Models Applied on the Self\u2010Assembly of Bis(merocyanine) 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