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The very low fluorescence quantum yield (\u224810<jats:sup>\u22124<\/jats:sup>) for CR in dilute solutions together with the absence of a triplet state indicates that internal conversion is the dominant deactivation route with more than 99.99\u2009% of the quanta loss (attributed to the energy gap law for radiationless transitions). Although no direct evidence for <jats:italic>trans<\/jats:italic>\u2013<jats:italic>cis<\/jats:italic> photoisomerization was obtained from absorption or fluorescence data, the global analysis of fs\u2010transient absorption data indicates the presence of a photoproduct with a lifetime of \u2248170\u2005ps that is suggested to be associated with such a process. Spectral data for more concentrated CR solutions indicate the presence of oblique or twisted J\u2010type aggregates. These results are compared with spectra for CR in the solid state (sodium salt) and intercalated in a layered double hydroxide via a one\u2010step co\u2010precipitation route. 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