The shape of vibronic absorption bands and the structure of dye dimers

Al'perovich, L. I.

doi:10.1007/bf02578499

Cited by 3 publications

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“…Bergmann and O'Konski reported the formation of this compound from methylene blue via a demethylation reaction in a spectroscopic study of the methylene blue dimer . The methylene blue dimer itself has been subject to various studies, which indicate that the structure of the dimer is “sandwich”-like. , The absorption maximum of the dimer is found at 605 nm (for the monomer: 664 nm). This dimer is most likely the species observed in thin gel sheets of the PA−MBO system by Watzl and Münster …”

Section: Methodsmentioning

confidence: 99%

Complex Pattern Formation in the Polyacrylamide−Methylene Blue−Oxygen Reaction

1999

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The polyacrylamide-methylene blue-oxygen system reveals a variety of complex concentration patterns. Chevron and white-eye patterns develop from simple hexagons in a slow, continuous transition process. A third type of structure (honeycombs) forms from either white-eye patterns or hexagons. This transition occurs rapidly along propagating fronts. Two-dimensional Fourier analyses reveal that the complex patterns have a simple structure and that the wave vectors of the initial hexagons are conserved in all transitions. Quantitative data on surface undulations of the gel are presented. The surface structure resembles the structure of the observed methylene blue patterns. A schematic phase diagram is presented that characterizes the pattern geometry in terms of reaction time and initial sulfide concentration.

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