Synthesis and properties of cobalt(III) complexes of tripodal ligands containing amide functional groups

Abstract

Two new, trigonally symmetrical, triamide tripodal ligands and their complexes with the cobalt(III) ion, [1,1,1-tris(4-amino-1-oxo-2-azabutyl)ethanato]cobalt(III)trihydrate 1 and [1,1,1-tris(4-amino-4-methyl-3-oxo-2-azapentyl)ethanato]cobalt(III)–water–ethanol (1/8/0.5) 2 have been prepared. The hexadentate structures of the neutral, trigonal, triamido complexes have been established by an X-ray study of 1 and ¹³C NMR spectrometry of both molecules. The chemical, spectroscopic and electrochemical properties of the complexes have been investigated as well as those of the monoamido tripodal complex [1,9-diamino-5-(4-amino-2-azabutyl)-5-ethoxycarbonyl-4-oxo-3,7-diazanonanato]cobalt(III) chloride.

References

1. F. P. Dwyer, N. S. Gill, E. C. Gyarfas and F. Lions, J. Am. Chem. Soc., 1957, 79, 1269; F. Lions, Rev. Pure Appl. Chem., 1969, 19, 177.
2. R. W. Green, K. W. Catchpole, A. T. Phillip and F. Lions, Inorg. Chem., 1963, 2, 597.
3. J. E. Sarneski and F. L. Urbach, J. Am. Chem. Soc., 1971, 93, 884.
4. K. Tomioka, U. Sakaguchi and H. Yoneda, Inorg. Chem., 1984, 23, 2863.
5. H. Okazaki, U. Sakaguchi and H. Yoneda, Inorg. Chem., 1983, 22, 1539.
6. I. I. Creaser, R. J. Geue, J. M. Harrowfield, A. J. Herlt, A. M. Sargeson, M. R. Snow and J. Springborg, J. Am. Chem. Soc., 1982, 104, 6016.
7. A. M. Sargeson, Chem. Br., 1979, 15, 23 and refs. therein.
8. A. McAuley, S. Subramanian and T. W. Whitcombe, J. Chem. Soc., Dalton Trans., 1993, 2209.
9. G. A. Lawrance and P. G. Lye, Comments Inorg. Chem., 1994, 15, 339 and refs. therein.
10. A. H. R. Al-Obaidi, K. B. Jensen, J. J. McGarvey, H. Toftlund, B. Jensen, S. E. J. Bell and J. G. Carroll, Inorg. Chem., 1996, 35, 5055.
11. A. M. Sargeson, Pure Appl. Chem., 1986, 58, 1511.
12. I. J. Clark, R. J. Geue, L. M. Engelhardt, J. MacB. Harrowfield, A. M. Sargeson and A. H. White, Aust. J. Chem., 1993, 46, 1485.
13. M. P. Suh and D. Kim, Inorg. Chem., 1985, 24, 3712.
14. T. Sato, H. Takeda, K. Sakai and T. Tsubomura, Inorg. Chim. Acta, 1996, 246, 413.
15. L. R. Gahan, T. W. Hambley, A. M. Sargeson and M. R. Snow, Inorg. Chem., 1982, 21, 2699.
16. J. I. Bruce, L. R. Gahan, T. W. Hambley and R. Stranger, Inorg. Chem., 1993, 32, 5997.
17. K. G. Ragunathan and P. K. Bharadwaj, J. Chem. Soc., Dalton Trans., 1992, 2417.
18. C. M. Thorne, S. C. Rawle, G. A. Admans and S. R. Cooper, J. Chem. Soc., Chem. Commun., 1987, 306.
19. H. Sigel and R. B. Martin, Chem. Rev., 1982, 82, 385.
20. T. J. Collins, R. D. Powell, C. Slebodnick and E. S. Uffelman, J. Am. Chem. Soc., 1991, 113, 8419.
21. D. W. Margerum, Pure Appl. Chem., 1983, 55, 23.
22. D. W. Margerum and G. D. Owens, Metal Ions in Biological Systems, 1981, 12, 75.
23. E. Kimura, J. Coord. Chem., 1986, 15, 1.
24. R. J. Geue, W. R. Petri, A. M. Sargeson and M. R. Snow, Aust. J. Chem., 1992, 45, 1681.
25. H. Lund and A. Voigt, Org. Synth., 1948, Coll. Vol. II, 594.
26. H. Böhme and L. Häfer, Chem. Ber., 1966, 99, 281; Chem. Ber., 1966, 99, 879.
27. T. J. Collins, K. L. Kostka, E. S. Uffelman and T. L. Weinberger, Inorg. Chem., 1991, 30, 4204.
28. For an explanation of the lel and ob terminology, see Inorg. Chem., 1970, 9, 1.
29. P. V. Bernhardt, A. M. T. Bygott, R. J. Geue, A. J. Hendry, B. R. Korybut-Daszkiewicz, A. M. Sargeson and A. C. Willis, Inorg. Chem., 1994, 33, 4553.
30. M. L. Schneider, G. Ferguson and R. J. Balahura, Can. J. Chem., 1973, 51, 2180.
31. M. T. Barnet, D. A. Buckingham, H. C. Freeman, I.-N. Hsu and D. van der Helm, Chem. Commun., 1970, 367.
32. G. A. Lawrance, P. A. Lay and A. M. Sargeson, Inorg. Chem., 1990, 29, 4808.
33. A. M. Bond, G. A. Lawrance, P. A. Lay and A. M. Sargeson, Inorg. Chem., 1983, 22, 2010.
34. M. K. Kim and A. E. Martell, J. Am. Chem. Soc., 1966, 88, 914; Biochemistry, 1964, 3, 1169.
35. D. J. Bull, I. I. Creaser, A. M. Sargeson, B. W. Skelton and A. H. White, Inorg. Chem., 1987, 26, 3040 and refs. therein.
36. R. J. Geue, A. J. Hendry and A. M. Sargeson, J. Chem. Soc., Chem. Commun., 1989, 1646.
37. D. W. Margerum, K. L. Chellappa, F. P. Bossu and G. L. Burce, J. Am. Chem. Soc., 1975, 97, 6894; E. J. Subak, Jr., V. M. Loyola and D. W. Margerum, Inorg. Chem., 1985, 24, 4350; T. L. Pappenhagen, W. R. Kennedy, C. P. Bowers and D. W. Margerum, Inorg. Chem., 1985, 24, 4356.