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A comparative investigation of the mass spectra of the compounds Me2PhE, MePh2E, MeEtPhE (where E = P, As or Sb), PhPriEH (where E = N, P or As), MePhAsH, MePhEX (where X = Cl or I and E = As; X = Br and E = Sb) and PhPriEX (where X = Cl and E = P or As) has been undertaken at 70 eV. The main fragmentation pathways have been determined and the criteria established for the interpretation of spectra of these simple derivatives applied to a series of more complex arsines.

The crystal structure of the title compound, [Tl(S2CNEt2)3], has been determined by single-crystal X-ray diffraction methods at 295 K and refined by full-matrix least squares to a residual of 0.050 for 2517 'observed' reflections. Crystals are monoclinic, with space group A2/a, a 14.789(7), b 10.428(4), c 18.207(9) Ǻ, β 118.11(4)°, Z 4, and are isostructural with those of the previously determined gallium and indium analogues, the molecule having 2 symmetry with 2.666 Ǻ. As in the dimethyl/thallium analogue, the departure of the TlS6 core symmetry from 3 is large and is examined in terms of electron-pair repulsion theory.