Versatility of silica used as a ligand: Effect of thermal treatments of silica on the nature of silica-supported alkyl tantalum species

Journal of Organometallic Chemistry

Volumn 593-594, Issue , 2000, Pages 96-100

  Lefort, Laurent ^a   Chabanas, Mathieu ^a   Maury, Olivier ^a   Meunier, Damien ^a   Copéret, Christophe ^a   Thivolle Cazat, Jean ^a   Basset, Jean Marie ^a  

^a CPE LYON   (France)

Author keywords

Catalyst preparation; Dehydroxylation; Silica; Surface organometallic chemistry; Surface species; Tantalum

Indexed keywords

EID: 0034649952     PISSN: 0022328X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0022-328X(99)00396-4     Document Type: Article

References (24)

1. An illustration of this concept can be found in the field of asymmetric catalysis: R. Noyori, Asymmetric Catalysis in Organic Synthesis, Wiley, New York, 1994.
2. For some reviews on surface organometallic chemistry, see: (a) S. L. Scott, J.-M. Basset, G.P. Niccolai, C.C. Santini, J.-P. Candy, C. Lécuyer, F. Quignard, A. Choplin, New. J. Chem. 18 (1994) 115.
3. (b) G.P. Niccolai, J.M. Basset, in: E.G. Derouane, J. Haber, F. Lemos, F. Ramoa Ribeiro, M. Guisnet (Eds.), Catalytic Activation and Functionalisation of Light Alkanes: Advances and Challenges, NATO ASI Series 3/44, Kluwer, Dordrecht, 1998.
4. (c) F. Lefèbvre, J. Thivolle-Cazat, V. Dufaud, G.P. Niccolai, J.-M. Basset, Appl. Catal. A 182 (1999) 1.
5. Dufaud V., Niccolai G.P., Thivolle-Cazat J., Basset J.-M. J. Am. Chem. Soc. 117:1995;4288.
6. Siloxane bridges formed after dehydroxylation at 500°C do not react with organometallics like 1, see: Ref. [3].
7. Other studies have already shown similar behavior: (a) For Ti: S.A. Holmes, F. Quignard, A. Choplin, R. Teissier, J. Kervennal, J. Catal. 176 (1998) 173.
8. (b) For Zr: F. Quignard, C. Lécuyer, C. Bougault, F. Lefebvre, A. Choplin, D. Olivier, J.-M. Basset, Inorg. Chem. 31 (1992) 928; J. Schwartz, M.D. Ward, J. Mol. Catal. 8 (1980) 465.
9. (b) For Zr: F. Quignard, C. Lécuyer, C. Bougault, F. Lefebvre, A. Choplin, D. Olivier, J.-M. Basset, Inorg. Chem. 31 (1992) 928; J. Schwartz, M.D. Ward, J. Mol. Catal. 8 (1980) 465.
10. (c) For Hf: L. d'Ornelas, S. Reyes, F. Quignard, A. Choplin, J.-M. Basset, Chem. Lett. (1993) 1931
11. (d) For Cr: J. Amor Nait Ajjou, S.L. Scott, Organometallics 16 (1997) 86.
12. Psaro R., Ugo R., Zanderighi G.M., Besson B., Smith A.K., Basset J.-M. J. Organomet. Chem. 213:1981;215.
13. Schrock R.R., Fellman J.D. J. Am. Chem. Soc. 100:1978;3359.
14. The surface organometallic species prepared via sublimation or impregnation have identical IR spectra and chemical reactivity.
15. -1). Indeed, our group has shown that organometallics like 1 react with these surface groups: S. Scott, J.-M. Basset, unpublished results.
16. (a) B.A. Morrow, Stud. Surf. Sci. Catal. A 57 (1990) A161 and references therein.
17. (b) E.F. Vansant, P. Van Der Voort, K.C. Vrancken, Stud. Surf. Sci. Catal. (1995) 93 and references therein.
18. (c) Y. Wang, B.A. Morrow, Langmuir 12 (1996) 4153.
19. (d) V.I. Bogillo, L.S. Pirnache, A. Dabrowski, Langmuir 13 (1997) 928.
20. -1) is usually assigned to interparticular and interacting silanols. Only the latter is assumed to react with 1, see Ref. [10].
21. D. Meunier, A. de Mallmann, unpublished results.
22. Vidal V., Théolier A., Thivolle-Cazat J., Basset J.-M., Corker J. J. Am. Chem. Soc. 118:1996;4595.
23. A model calculated by F. Bayard with the computer program Sybyl is consistent with data given by: J.A.N. Ajjou, S.L. Scott, Organometallics 16 (1997) 86.
24. However, the presence of a few remaining silanols cannot be excluded. Silanols interacting with alkyl fragments are indeed difficult to be observed by IR spectroscopy. C. Nédez, A. Théolier, F. Lefèvbre, A. Choplin, J.-M. Basset, J.F. Joly, J. Am. Chem. Soc. 115 (1993) 722.