Conclusions The complexation reactions of I, which possesses a pendant phenanthroline with a carbonyl group in the 2-position, occur via the carbonyl oxygen and the adjacent nitrogen on the phenan-throline ring. Subsequent rearrangement reactions may occur which result in a tridentate complex involving the carbonyl oxygen and both phenanthroline nitrogens. The latter behavior has been observed for Fe (II), Ti (III), and V (II). Further work on the substitution and electron-transfer reactions of complex I are in progress. Acknowledgment. We thankDr. M. Mlekuz and L. Randall for acquiring the 13C NMR spectra. We also thank the Natural Sciences and Engineering Research Council of Canada for fi-nancial support.