Abstract

Specific measures of partial distance (specific MPD's) have been used to analyse the electronic structures of 20 different π-systems in terms of their building blocks, with particular emphasis on the polymethinic chain. The strength of the coupling of the polymethinic chain to a conjugated hydrocarbon building block in the electronic ground state depends on the number of π-electrons involved in the coupled fragments. For excited states the specific MPD's make it possible to distinguish between locally excited polymethnne-like states and delocalized states with greater reorganization of the electronic structure.

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