Abstract
The π-electronic transitions of 2-aryl- and 2-amino-3-arylazopropenoic acid esters were interpreted in terms of localisation on molecular fragments and charge transfer between them. The localisation is characterised by atomic and the respective fragmental localisation numbers LA obtained by a transition density matrix formalism within a standard PPP calculation. A band analysis of the UV spectra based on a normal logarithmic distribution function is presented.
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