Electron impact ionisation energies of some halo-cyclotriphosphazenes

Abstract

Ionisation energies have been determined for N₃P₃F_nX_6−n where n = 2, 3 and 4 and X = Br, Cl or NMe₂, using an electron impact ion source and the semi-logarithmic plot method. Results are compared with values for N₃P₃X₆ where X = Br, Cl, F or NMe₂. The substitution of dimethylamino groups for fluorines in N₃P₃F₆ causes a marked decrease in ionisation energy. A similar though less pronounced decrease occurs on substitution of fluorine by bromine or chlorine. The appearance energies were determined for several fragment ions.