Abstract
A series of polymethine dyes with sulphur-containing end-groups have been investigated by spectral and quantum-chemical methods. The shift in absorption maximum with lengthening of the polymethine chain has been shown to depend on the nature of the first member of the vinylene series. Possible causes of this are discussed and a correlation between the first vinylene shift and the electron density change on excitation at the sulphur atoms has been established.
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