Magnetic communication in acyclic mixed-valence trimolybdenum complexes mediated by redox switching

Abstract

Reversible one-electron reduction converts the ‘V-shaped’ [Mo(NO)[HB(dmpz)₃]{OC₆H₄XpyMo(NO)[HB(dmpz)₃]- Cl}₂] (dmpz = 3,5-dimethylpyrazolyl; X = nothing, CH[double bond, length half m-dash]CH or CH₂CH₂; py = pyridyl) with two unpaired electrons on the peripheral metals, whose magnetic exchange properties depend on X, into a monoanion having three unpaired paired spins on each metal centre which engage in magnetic exchange in solution irrespective of X.

References

1. R. J. Rushby and J.-L. Pauillaud, in An Introduction to Molecular Electronics, ed. M. C. Petty, M. R. Bryce and D. Bloor, Edward Arnold, London, 1995, p. 72; O. Kahn, O. Cador, J. Larionova, C. Mathoniere, J. P. Sutter and L. Ouahab, Mol. Cryst. Liq. Cryst., Sect. A, 1997, 305, 1.
2. H. Tanaka, T. Tokuyama, T. Sato and T. Ota, Chem. Lett., 1990, 1813; P. M. Allemand, K. C. Khemani, A. Koch, F. Wudl, K. Holczer, K. Donovan, G. Grüner and J. D. Thompson, Science, 1991, 253, 301; Y. Nakazawa, M. Tamura, N. Shirakawa, D. Shiomi, M. Takahashi, M. Kinoshita and M. Ishikawa, Phys. Rev. B, 1992, 46, 8906; J. Veciana, C. Rovira, N. Ventosa, M. I. Crespo and F. Palacio, J. Am. Chem. Soc., 1993, 115, 57; A. Lang, H. Naarmann, G. Rosler, B. Gotschy, H. Winter and E. Dormann, Mol. Phys., 1993, 79, 1051; T. Nogami, K. Tomioka, T. Ishida, H. Yoshikawa, M. Yasui, F. Iwasaki, H. Iwamura, N. Takeda and M. Ishikawa, Chem. Lett., 1994, 29; S. Rajca and A. Rajca, J. Am. Chem. Soc., 1995, 117, 9172; M. M. Matsushita, A. Izuoka, T. Sugawara, T. Kobayashi, N. Wada, N. Takeda and M. Ishikawa, J. Am. Chem. Soc., 1997, 119, 4369; K. Matsuda, T. Yamagata, T. Seta, H. Iwamura and K. Hori, J. Am. Chem. Soc., 1997, 119, 8058; J. Cirujeda, O. Jurgens, J. Vidal Cancedo, C. Rovira, P. Turek and J. Veciana, Mol. Cryst. Liq. Cryst., Sect. A, 1997, 305, 367.
3. J. K. McCusker, E. A. Schmitt and D. N. Hendrickson, in Magnetic Molecular Materials, NATO ASI Series, ed. D. Gatteschi, O. Kahn, J. S. Miller and F. Palacio, Kluwer Academic Press, 1991, vol. E198, p. 297; O. Kahn, Molecular Magnetism, VCH, New York, 1993; M. L. Allan, J. H. F. Martens, A. T. Coomber, R. H. Friend, I. Marsden, E. A. Marseglia, A. E. Underhill and A. Charlton, Mol. Cryst. Liq. Cryst., 1993, 230, 387; P. J. Vankoningsruggen, J. N. Koga, Y. Ishimaru and H. Iwamura, Angew. Chem., Int. Ed. Engl., 1996, 35, 755; H. L. Nie, S. M. J. Aubin, M. S. Matshuta, R. A. Porter, J. F. Richardson and D. N. Hendrickson, Inorg. Chem., 1996, 35, 3325.
4. J. McConnell, J. Chem. Phys., 1963, 39, 1910.
5. A. M. W. Cargill Thompson, D. Gatteschi, J. A. McCleverty, J. A. Navas, E. Rentschler and M. D. Ward, Inorg. Chem., 1996, 35, 2701; V. An Ung, A. M. W. Cargill Thompson, D. A. Bardwell, D. Gatteschi, J. C. Jeffery, J. A. McCleverty, F. Totti and M. D. Ward, Inorg. Chem., 1997, 36, 3447.
6. S. L. W. McWhinnie, J. A. Thomas, T. A. Hamor, C. J. Jones, J. A. McCleverty, D. Collison, F. E. Mabbs, C. J. Harding, L. J. Yellowlees and M. G. Hutchings, Inorg. Chem., 1996, 35, 760.
7. A. J. Amoroso, A. M. W. Cargill Thompson, J. P. Maher, J. A. McCleverty and M. D. Ward, Inorg. Chem., 1995, 34, 4828.
8. N. Al-Obaidi, M. Chaudhury, D. Clague, C. J. Jones, J. C. Pearson, J. A. McCleverty and S. S. Salam, J. Chem. Soc., Dalton Trans., 1987, 1733; A. Das, J. C. Jeffery, J. P. Maher, J. A. McCleverty, E. Schatz, M. D. Ward and G. Wollerman, Inorg. Chem., 1993, 32, 2145.
9. R. Cook, J. P. Maher, J. A. McCleverty, M. D. Ward and A. Wlodarczyk, Polyhedron, 1993, 12, 2111.
10. R. Shonfield, A. A. Jouaiti, J. P. Maher, J. A. McCleverty and M. D. Ward, unpublished work.