Et -Ed. c ß = KiKiK$ for bipy and K,K% for terpy. d Estimated.12 diethylenetriamine complexes.The corresponding ratio for the zinc and cadmium complexes is only 1.2, Bis (pyrrole-2-aldimino) metal (II) Complexes 625 suggesting that terpyridine chelates comparatively more weakly with these metal ions. It is unlikely, however, that they are acting as bidentate ligands only, since the structure of Zn (terpy) Cl2 shows that all three nitrogens coordinate with only minor strain.13 Although there are puzzling features which certainly require further examination, nevertheless a good deal of understanding now exists in this particular area. We are turning our attention to solvents other than water as well as metal ions such as chromium(II) and vanadium(II), for which there is a paucity of data.

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