Twisting the silicon backbone conformation in oxygen containing oligosilanes towards dihedral angles of 120–130° either by intramolecular hydrogen bonding or incorporation into a covalently bonded ring system effectively extends the delocalization of electrons in these σ–n mixed conjugated systems.
C. Krempner, R. Ludwig, A. Flemming, R. Miethchen and M. Köckerling, Chem. Commun., 2007, 1810 DOI: 10.1039/B618438C
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