The energy diffusion in bundled cylindrical 3,3'-bis- (2-sulfopropyl)-5,5',6,6'-tetrachloro-1,1'-dioctylbenzimida-carbocyanine (C8S3) J-aggregates was measuredusing direct imaging of fluorescence emission with highly localized excitation. Adrop-flow technique was utilized to deposit the nanotubular structures onto glasssubstrates. Fluorescence confocal images of the aggregates were collected andregions of interest within the sample were identified. These regions were probedwith a focused laser spot, and the resulting emission was imaged onto an electronmultiplying charged coupled device camera. A two dimensional Gaussian fittingscheme was used to quantitatively compare the excitation beam profile to thebundled aggregate emission profiles. While C8S3 J-aggregate systems are oftenstudied as artificial, one-dimensional light harvesting systems, experimental resultsindicate that energy diffusion may not be limited to a single dimension in bundledsamples.

Direct measure of energy migration in supramolecular carbocyanine dye aggregates

247th National Meeting (2014)

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