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which the color changed from orange to green-brown. The solvent was removed by rotary evaporation and the residual oil was redissolved in 250 ml of distilled water. The aqueous solution was extracted with four 125-ml portions of benzene and then added to a solution of 5 g tetramethylammonium chloride in 25 ml of water. The cloudy solution was clarified by the addition of 50 ml of acetone and then rotary-evaporated to a volume of about 25 ml by which time the formation of black crystals had occurred. The crystals were filtered, washed with ethanol, and weighed; yield 0.21 g (0.71 mmol, 65%).Cs[(n-C,Hs)CoIII(n-2-B,CH,)]. A 0.30-g sample of orange (n-

The Raman spectrum of the complex XF4,2SbF, is consistent with the ionic formulation XeF,+,Sb,F,,-, and the 19F n.m.r. spectrum of the complex in solution in antimony pentafluoride has an AB, spectrum in the F-on-Xe region which may be unambiguously assigned to the XeF,+ ion.

CanadaMagnetic-susceptibility and e.s.r. data are reported for compounds of the type Cu(RCO,), L (where RC02 is an arylcarboxylate and L is aniline or pyridine). The results for the antiferromagnetic compounds have been analysed on both the Bleaney-Bowers and Jotham-Kettle models. The pyridine derivatives have singlet-triplet separations in the range 290-355 cm-l. Four aniline derivatives have been prepared in which the singlet-triplet separations are 250-335 cm-l; these results are contrasted with earlier work which showed the interval to be reduced to ca. 100 cm-l in aniline derivatives of copper(l1) alkylcarboxylates.

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