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The Lewis acid-base adducts (P 4 E 3 )‚(BX 3 ) (E ) S, Se; X ) Br, I) and (P 4 Se 3 )‚(NbCl 5 ) have been prepared and characterized by Raman, IR, and solid-state 31 P MAS NMR spectroscopy. Hybrid density functional calculations (B3LYP) have been carried out for both the apical and the basal (P 4 E 3 )‚(BX 3 ) (E ) S, Se; X ) Br, I) adducts. The thermodynamics of all considered species has been discussed. In accordance with solid-state 31 P MAS NMR and vibrational data, the X-ray powder diffraction structures of (P ). Basal adducts are formed when P 4 Se 3 is used as the donor species. Vibrational assignment for the normal modes of these adducts has been made on the basis of comparison between theoretically obtained and experimentally observed vibrational data.

Tetraphosphorus triselenide boron triiodide (P 4 Se 3 )·(BI 3 ) has been prepared. The product formed has been characterized by Raman and IR spectroscopy. Vibrational assignments for the normal modes of this Lewis acid-base adduct have been made on the basis of comparison between theoretically obtained and experimentally observed Raman and IR data. The geometries of several possible tetraphosphorus triselenide boron triiodide (P 4 Se 3 )·(BI 3 ) adducts have been calculated. The bonding and electron transfer from the tetraphosphorus triselenide P 4 Se 3 unit to the Lewis acid BI 3 has been investigated by applying NBO analysis.

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