Abstract
Electronic absorption spectra of methylene blue layers adsorbed on glass plates have been measured. Higher aggregates of this dye, up to the tetramer, are shown to exist by an analysis of the aggregate spectra on the basis of a three‐dimensional PPP calculation and a diagrammatic exciton‐splitting model. A shoulder, located around the monomer peak, observed in the spectrum of the adsorbed methylene blue layer is tentatively assigned to the tetramer. The observed spectral behaviour on aggregation is reproduced by the PPP calculation in which a sandwich type structure is assumed for the aggregates. The band splitting patterns in the methylene blue aggregates are explained diagrammatically in terms of the interactions of the transition moments of the monomer sub‐units in an aggregate.
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