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The charge-transfer effects of systems of the general type A-B-B are investigated, A being the donor. The importance of a one-to-one correspondence between Hückel-parameters and parameters such as effective nuclear charges and bond distances is pointed out. By using charge-transfer effects as an example it is shown that non-uniqueness leads to difficulties in interpreting charge-transfer effects.

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Konsequenzen einer abbildungstheoretischen Deutung von Hückel-Parametern für die Diskussion von Charge-Transfer-Effekten in Dreizentrensystemen / Interpretation of Hüchel-Parameters by Means of a Mapping Concept: Consequences in the Discussion of Charge Transfer Effects in Three Centre Systems