The reaction between tetra-tert-butoxytin and Al(110)-OH in ultrahigh vacuum: Contrasting behavior vs its zirconium analogue

Langmuir

Volumn 14, Issue 7, 1998, Pages 1532-1534

  Lu, Gang ^a   Schwartz, Jeffrey ^a   Bernasek, Steven L ^a  

^a PRINCETON UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION SPECTROSCOPY; ALUMINUM; INFRARED SPECTROSCOPY; STOICHIOMETRY; THERMAL EFFECTS; TIN COMPOUNDS; VACUUM APPLICATIONS; X RAY PHOTOELECTRON SPECTROSCOPY;

TETRA TERT BUTOXYTIN;

METALLORGANIC CHEMICAL VAPOR DEPOSITION;

EID: 0032025939     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la971125t     Document Type: Article

References (24)

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5. For recent examples, see: (a) Merlen, E.; Beccat, P.; Bertolini, J. C.; Delichere, P.; Zanier, N.; Didillon, B. J. Catal. 1996, 159, 178. (b) Lee, A. F.; Baddeley, C. J.; Hardacre, C.; Moggridge, G. D.; Ormerod, R. M.; Lambert, R. M. J. Phys. Chem. B 1997, 101, 2797.
6. For recent examples, see: (a) Simianu, V. C.; Hossenlopp, J. M. Appl. Organomet. Chem. 1997, 11, 147. (b) Jiménez, V. M.; Mejias, J. A.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 545. (c) Jiménez, V. M.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 556.
7. For recent examples, see: (a) Simianu, V. C.; Hossenlopp, J. M. Appl. Organomet. Chem. 1997, 11, 147. (b) Jiménez, V. M.; Mejias, J. A.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 545. (c) Jiménez, V. M.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 556.
8. For recent examples, see: (a) Simianu, V. C.; Hossenlopp, J. M. Appl. Organomet. Chem. 1997, 11, 147. (b) Jiménez, V. M.; Mejias, J. A.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 545. (c) Jiménez, V. M.; Espinós, J. P.; González-Elipe, A. R. Surf. Sci. 1996, 366, 556.
9. Willeman, H.; Van De Vondel, D. F.; Van Der Kelen, G. P. Inorg. Chim. Acta 1979, 34, 175.
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12. 5/2 BE = 484.3 eV). In all cases, binding energies were compared with those measured for Al(2p) (73.41-73.50 eV) and O(1s) (534.8-535.1 eV) in order to minimize effects of possible surface charging.
13. (a) Moulder, J. F.; Stickle, W. F.; Sobol, P. E.; Bomben, K. D. Handbook of X-ray Photoelectron Spectroscopy; Chastain, J., Ed.; Perkin-Elmer Co., Physical Electronics Division: Eden Prairie, MN, 1992.
14. (b) Kövér, L.; Barna, P. B.; Sanjinés, R.; Kovács, Zs.; Margaritondo, G.; Adamik, M.; Radi, Zs. Thin Solid Films 1996, 281-282, 90.
15. C-O).
16. Tin metal is prepared by reduction of the oxide with carbon. See, Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed.; Grayson, M., Ed.; John Wiley & Sons: New York, 1983; Vol 23, pp 21-22.
17. Reduction of zirconium oxide can be accomplished under forcing conditions using Mg or Ca. See, Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed.; Grayson, M., Ed.;John Wiley & Sons: New York, 1983; Vol 24, pp 872-873.
18. VanderKam, S. K.; Lu, G.; Bernasek, S. L.; Schwartz, J. J. Am. Chem. Soc. 1997, 119, 11639.
19. C-O).
20. 1s comparable to that of the phenoxy carbon atom).
21. Miller, J. B.; Schwartz, J.; Bernasek, S. L. J. Am. Chem. Soc. 1993, 115, 8239.
22. Jensen, F. R. Acc. Chem. Res. 1983, 16, 177.
23. 4 adducts with i-PrOH are structurally similar di-μ-alkoxy bridged dimers in which each metal is 6-coordinate. An intriguing observation is that average Sn-O distances for monodentate axial (2.12 Å) and monodentate equatorial (1.95 Å) alkoxide ligands are different by only ca. 0.17 Å (see: Reuter, H.; Kremser, M. Z. Anorg. Allg. Chem. 1991, 598 / 599, 259), but for the Zr analogue this difference (axial 2.27 Å vs equatorial 1.93 Å) is ca. 0.34 Å (see, Vaartstra, B. A.; Huffman, J. C.; Gradeff, P. S.; Hubert-Pfalzgraf, L. G.; Daran, J.-C.; Parraud, S.; Yunlu, K.; Caulton, K. G. Inorg. Chem. 1990, 29, 3126). Significantly, coordination of the alcohol in two of the four axial sites of the dimer is indicated; perhaps bonding of the alcohol is stronger to Sn(IV) than to Zr(IV) in these model systems. If so, it may be that 3 binds more strongly than 1 to surface -OH groups of oxidized Al, giving rise to the observed difference in chemisorption stoichiometries.
24. 4 adducts with i-PrOH are structurally similar di-μ-alkoxy bridged dimers in which each metal is 6-coordinate. An intriguing observation is that average Sn-O distances for monodentate axial (2.12 Å) and monodentate equatorial (1.95 Å) alkoxide ligands are different by only ca. 0.17 Å (see: Reuter, H.; Kremser, M. Z. Anorg. Allg. Chem. 1991, 598 / 599, 259), but for the Zr analogue this difference (axial 2.27 Å vs equatorial 1.93 Å) is ca. 0.34 Å (see, Vaartstra, B. A.; Huffman, J. C.; Gradeff, P. S.; Hubert-Pfalzgraf, L. G.; Daran, J.-C.; Parraud, S.; Yunlu, K.; Caulton, K. G. Inorg. Chem. 1990, 29, 3126). Significantly, coordination of the alcohol in two of the four axial sites of the dimer is indicated; perhaps bonding of the alcohol is stronger to Sn(IV) than to Zr(IV) in these model systems. If so, it may be that 3 binds more strongly than 1 to surface -OH groups of oxidized Al, giving rise to the observed difference in chemisorption stoichiometries.