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DOI: 10.1039/A803680B (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 3065-3070

Chemistry of bulky tetrakis(pyrazolyl)borate ligands [B(pzR)4]– (R = p-CH3OC6H4 or C6H11)[hair space]†

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José A. Campo, Mercedes Cano, José V. Heras, Elena Pinilla, Angeles Monge and Jon A. McCleverty

Abstract

The ligands [B(pzR)4]– [R = p-CH3OC6H4 (An) or C6H11 (Cy)] and their corresponding complexes [Mo(pzRTpR)(CO)2(NO)] (R = An 1 or Cy 2) and [MoCl2(pzRTpR)(NO)] (R = An 3 or Cy 4) have been prepared. The molecular structures determined by NMR and X-ray crystallography reveal in all cases the formation of only one isomer having a three-co-ordinated tetrakis(pyrazolyl)borate ligand with the R substituents at the 3 position of the pyrazolyl rings, i.e. the symmetric form (3R,3R,3R,3R). The incorporation of the fourth pyrazolyl arm coupled to the use of different bulky substituents on the pyrazolyl rings has been analysed over the cavities produced around the molybdenum centres, and the results compared to those for related tris(pyrazolyl)borate derivatives. A greater protection of the molybdenum atom is provided by the p-CH3OC6H4 substituents, which also give rise to more rigid frameworks.

References

  1. S. Trofimenko, Chem. Rev., 1993, 93, 943 CrossRef CAS and refs. therein.
  2. M. Cocivera, G. Ferguson, F. J. Lalor and P. Szczecinski, Organometallics, 1982, 1, 1139 CrossRef CAS.
  3. C. H. Dungan, W. Maringgele, A. Meller, K. Niedenzu, H. Noth, J. Serwatowska and J. Serwatowski, Inorg. Chem., 1991, 30, 4799 CrossRef CAS.
  4. D. N. Reger, S. J. Knox, M. F. Huff, A. L. Rheingold and B. S. Haggerty, Inorg. Chem., 1991, 30, 1754 CrossRef CAS.
  5. A. Domingos, J. Marçalo, A. Paulo, A. Pires de Matos and I. Santos, Inorg. Chem., 1993, 32, 5114 CrossRef CAS.
  6. A. Paulo, A. Domingos, J. Marçalo, A. Pires de Matos and I. Santos, Inorg. Chem., 1995, 34, 2113 CrossRef CAS.
  7. J. C. Calabrese and S. Trofimenko, Inorg. Chem., 1992, 31, 4810 CrossRef CAS.
  8. S. Trofimenko, J. C. Calabrese, J. K. Kochi, S. Wolowiec, R. B. Hulsbergen and J. Reedjik, Inorg. Chem., 1992, 31, 3943 CrossRef CAS.
  9. A. L. Rheingold, C. B. White and S. Trofimenko, Inorg. Chem., 1993, 32, 3471 CrossRef CAS.
  10. R. Han, G. Parkin and S. Trofimenko, Polyhedron, 1995, 14, 387 CrossRef CAS.
  11. S. Trofimenko, J. C. Calabrese, P. J. Donaille and J. S. Thompson, Inorg. Chem., 1989, 28, 1091 CrossRef CAS.
  12. M. Cano, J. V. Heras, A. Monge, E. Pinilla, E. Santamaría, H. A. Hilton, C. J. Jones and J. A. McCleverty, J. Chem. Soc., Dalton Trans., 1995, 2281 RSC.
  13. K. Niedenzu, P. M. Niedenzu and K. R. Warner, Inorg. Chem., 1985, 24, 1604 CrossRef CAS.
  14. S. Trofimenko, J. C. Calabrese and J. S. Thompson, Inorg. Chem., 1987, 26, 1507 CrossRef CAS.
  15. C. López, D. Sanz, R. M. Claramunt, S. Trofimenko and J. Elguero, J. Organomet. Chem., 1995, 503, 265 CrossRef CAS.
  16. A. L. Rheingold, G. P. A. Yap, L. M. Liable-Sands, I. A. Guzei and S. Trofimenko, Inorg. Chem., 1997, 36, 6261 CrossRef CAS.
  17. J. A. McCleverty, Polyhedron, 1989, 8, 1669 CrossRef CAS.
  18. B. J. Coe, J. D. Foulon, T. A. Hamor, C. J. Jones, J. A. McCleverty, D. Bloor, G. H. Cross and T. L. Axon, J. Chem. Soc., Dalton Trans., 1994, 3427 RSC.
  19. B. J. Coe, T. A. Hamor, C. J. Jones, J. A. McCleverty, D. Bloor, G. H. Cross and T. L. Axon, J. Chem. Soc., Dalton Trans., 1995, 673 RSC.
  20. A. A. Rahman, A. J. Amoroso, T. N. Branston, A. Das, J. P. Maher, J. A. McCleverty, M. D. Ward and A. Wlodarczyk, Polyhedron, 1997, 16, 4353 CrossRef CAS and refs. therein.
  21. C. López-Garabito, J. A. Campo, J. V. Heras, M. Cano, G. Rojo and F. Agulló-López, J. Phys. Chem., submitted Search PubMed.
  22. M. Cano, J. V. Heras, A. Monge, E. Gutiérrez, C. J. Jones, S. L. W. McWhinnie and J. A. McCleverty, J. Chem. Soc., Dalton Trans., 1992, 2435 RSC.
  23. A. J. Amoroso, P. L. Jones, J. A. McCleverty and R. A. Richardson, unpublished work.
  24. S. Trofimenko, J. Am. Chem. Soc., 1967, 89, 3170 CrossRef CAS.
  25. S. Trofimenko, J. Am. Chem. Soc., 1969, 91, 588 CrossRef CAS.
  26. D. Carmona, J. Ferrer, M. P. Lamata, L. A. Oro, H. H. Limbach, G. Scherer, J. Elguero and M. L. Jimeno, J. Organomet. Chem., 1994, 470, 271 CrossRef CAS.
  27. M. Cano, J. A. Campo and J. V. Heras, unpublished work.
  28. M. Cano, J. V. Heras, A. Monge, E. Pinilla, C. J. Jones and J. A. McCleverty, J. Chem. Soc., Dalton Trans., 1994, 1555 RSC.
  29. M. Cano, J. V. Heras, S. Trofimenko, A. Monge, E. Gutiérrez, C. J. Jones and J. A. McCleverty, J. Chem. Soc., Dalton Trans., 1990, 3577 RSC.
  30. A. L. Rheingold, B. S. Haggerty and S. Trofimenko, Angew. Chem., Int. Ed. Engl., 1994, 33, 1983 CrossRef.
  31. International Tables for X-Ray Crystallography, Kynoch Press, Birmingham, 1974, vol. 4, pp. 72–98 Search PubMed.
  32. J. M. Stewart, The X-RAY 80 System, Computer Science Center, University of Maryland, College Park, MD, 1985.
  33. SHELXTL, Version 5.05, AXS Siemens, Madison, WI, 1996.
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