Measurements from 1 to 100 atm have been made at one or more temperatures between —30° and 70°C by a special transformer ratio arm bridge operating at 10 kc; derived values of the Clausius-Mossotti function are of sufficient precision (0.1%) to justify comparison with theoretical pair fluctuation, polarizability and multipole moment interaction effects at higher densities. Helium shows a decrease of 0.3% and argon an increase of 0.1% in C-M at 100 atm, while nitrogen and methane show somewhat larger positive effects, especially at lower temperatures. A decreased effective polarizability of atom pairs at small distances is discussed as a possible explanation of the data for helium and argon, while the effect in nitrogen is consistent with quadrupole-induced dipole moments of pairs. A theory of octupole-induced dipole interactions is shown to be capable of explaining the methane results with plausible estimated values of the octupole moment.

The synthesis and characterisation of the homoleptic transition-metal complexes (1,8-Ph 2 -3,6-Me 2 C 12 H 4 N) 2 M (M = Cr, 1; M = Mn, 2; M = Fe, 3; M = Co, 4) are described. Formally two-coordinate, the solid-state structures of 2 and 3 reveal near-linear N-M-N geometries and significant bending of the flanking phenyl groups towards the metal centres. Solidstate magnetic measurements reveal high spin metal centres

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