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2-pyridyl radical, as suggested by Symons,24 then the agreement for both the N and H hyperfine coupling constants is much better. The observed spectrum shows three protons with a coupling constant of 4.3 G23 and a nitrogen coupling constant of 29.7 G.19 Examination of the calculated proton coupling constants for the pyridine cation, shown in Table I, reveals no correlation of the calculated and observed spectra. Further, the calculated nitrogen coupling constant for the cation is 52.5 G, which also does not agree with the observed 30 G. However, when we consider the 2-pyridyl calcula-(25) R. Strange and R. S. Drago, to be published.

The crystal structures of the hydrated nicotinate complexes of lanthanum(III) and samarium(III) have been determined by three-dimensional X-ray diffraction techniques using Patterson and Fourier syntheses. The compounds have the empirical formula [Ln(C SH 4NC02) 3(H20)2] and crystallize in space group Fife with lattice parameters a = 9.805 (5) A,b= 12.