Details

Autor(en) / Beteiligte

• Decouzon, M.
• Gal, J.-F.
• Guillemin, J.-C.
• Maria, P.-C.

Titel

The gas-phase basicity of ethyl-, ethenyl- and ethynylphosphines and arsines

Ist Teil von

• International journal of mass spectrometry and ion processes, 1998-05, Vol.175 (1), p.27-33

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1998

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• The gas-phase basicities of the title compounds have been determined by Fourier transform ion cyclotron resonance mass spectrometry. Arsines are systematically weaker bases than phosphines. Basicity decreases in both series in the order ethyl > ethenyl > ethynyl. On the basis of their ionization energies, the phosphorus atom is recognized as the preferred site of protonation in the phosphines studied. A similar reasoning applied to arsines does not allow a clear-cut conclusion to be made. As it appears from the experimental results of this study and the few data on alkyl and phenyl derivatives available in the literature, substituent effects are attenuated by a factor of approximately 1.15 when going from phosphines to arsines.