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Complexes of nickel(li) and iron(l1) of co-ordination number six with respect to the new potentially terdentate ligands 4-, 5-, and 6-methyl, and 5-nitro-2-pyridyldi-(2-pyridyl)amine are reported. Electronic and Mossbauer spectral data are analysed and it is noted that the influence of the substituent, though small, is detectable. The implications of the results in terms of D and rr covalency within the complexes is qualitatively discussed as are some factors influencing the bi-or ter-dentate co-ordination of the bases.

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The syntheses of the 5-nitro-and of the 4-, 5-, and 6-methyl-tri-(Z-pyridyI)amines are reported, together with those of the molybdenum carbonyl derivatives of the methyl compounds. The 100 MHz l H n.m.r. spectra are briefly discussed.Birmingham, Birmingham 4 STUDIES of complex formation of tri-(%pyridyl)amine with first row transition metals have recently been re-p0rted.l Interest in the nature of the metal-ligand bond has led us to prepare some new mono-substituted tri-(2-pyridyl) amines to investigate their co-ordination compounds with iron(11) and nickel(II).2 We report here the synthesis of four such compounds, their characterization as the molybdenum carbonyl derivatives, and their lH n.m.r. spectra. EXPERIMENTAL 1.r. spectra were recorded with Perkin-Elmer 225, 237, and 457 spectrometers for Nujol mulls or liquid films in caesiuin iodide supports. 1H N.1n.r. spectra of solutions in carbon tetrachloride and chloroform were measured with a Perkin-Elmer R12 (100 MHz) spectrometer with tetrainethylsilane as internal standard and scale factors 1 and 10.The general preparative method was derived from that used by Wibaut and La Bastide 3 for tri-(2-pyridyl)amine.