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The HOMO–LUMO gap in a series of π-bridged bis(phosphaalkenes) is investigated by theoretical methods. The deshielding of the experimental 31P-NMR chemical shifts of a selection of these compounds does not correlate with a decrease of their calculated HOMO–LUMO gaps.
Financial support by the Austrian Science Fund (FWF) (P20575-N19) and EU-COST Action CM 0802 (PhoSciNet) is gratefully acknowledged.
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