The influence of the molecular structure of several squaraine dyes on their aggregation in aqueous solutions and its spectral manifestation were studied. The results are analyzed using quantum-chemical modeling. It is shown that a transverse dipole moment in squaraine molecules contributes to aggregation with an antiparallel orientation of the molecules whereas a longitudinal dipole moment leads to formation of J-type aggregation with a longitudinal orientation of the molecules. In some instances both aggregate types are present in the solution over a wide concentration range.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 4, pp. 493–498, July–August, 2009.
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Nizamov, S.N., Barakaeva, M.N., Kurtaliev, E.N. et al. Influence of molecular structure of squaraine dyes on their aggregation in aqueous solutions. J Appl Spectrosc 76, 464–469 (2009). https://doi.org/10.1007/s10812-009-9238-3
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DOI: https://doi.org/10.1007/s10812-009-9238-3