The principal structural parameters of Ni(PF,) and Pt(PF3), have been determined by gas-phase electron diffraction, assuming a molecular point group T ; the geometry of the PF, ligands in the nickel compound differs very little from that of the free molecule.

Samwzary %C1 quadrupole resonance signals have been observed in eight salts of the HC1,-or DC1,-ion, all of which fall into two classes according as to whether the %C1 frequencies lie near 12 or 20 MHz: the results for CsCl,~(H,O+HCl,-) show that the low frequency signal is associated with a symmetric HC1,-ion, and the small shift observed on deuteriation can be explained in terms of a flat or nearly flat symmetric potential well.

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