Steric stabilization of a high-spin chromium(II) indenyl complex, [1,3-(C3H7)2C9H5] 2Cr

Organometallics

Volumn 18, Issue 18, 1999, Pages 3561-3562

  Overby, Jason S ^a   Hanusa, Timothy P ^a   Sellers, Scott P ^b   Yee, Gordon T ^b  

^a VANDERBILT UNIVERSITY   (United States)

^b UNIVERSITY OF COLORADO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000880550     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om990433e     Document Type: Article

References (26)

1. Heinemann, O.; Jolly, P. W.; Krüger, C.; Verhovnik, G. P. J. Organometallics 1996, 15, 5462-5463.
2. 5 are monomers.
3. (a) Shapiro, H.; DeWitt, E. G.; Brown, J. E. U.S. Patent 2,839,-552, 1956.
4. (b) Brown, J. E.; DeWitt, E. G.; Shapiro, H. U.S. Patent 2,964,548, 1957.
5. Bocarsly, J. R.; Floriani, C.; Chiesi-Villa, A.; Guastini, C. Inorg. Chem. 1987, 26, 1871-1875.
6. Westcott, S. A.; Kakkar, A. K.; Stringer, G.; Taylor, N. J.; Marder, T. B. J. Organomet. Chem. 1990, 394, 777-794.
7. O'Hare, D.; Murphy, V. J.; Kaltsoyannis, N. J. Chem. Soc., Dalton Trans. 1993, 383-392.
8. Hays, M. L.; Burkey, D. J.; Overby, J. S.; Hanusa, T. P.; Yee, G. T.; Sellers, S. P.; Young, V. G., Jr. Organometallics 1998, 17, 5521-5527.
9. Sitzmann has recently reported that solid octaisopropylchromocene displays sterically induced spin crossover from 2.83 to 4.90 μB on warning from 15 to 300 K (Sitzmann, H.; Schar, M.; Dormann, E.; Kelemen, M., Z. Anorg. Allg. Chem. 1997, 623, 1850-1852).
10. Cauletti, C.; Green, J. C.; Kelly, M. R.; Powell, P.; Van Tilborg, J.; Robbins, J.; Smart, J. J. Electron Spectrosc. Relat. Phenom. 1980, 19, 327-353.
11. Evans, S.; Green, M. L. H.; Nagy, A.; Stringer, G. J. Chem. Soc., Faraday Trans. 2 1972, 1847-1865.
12. Betz, P.; Döhring, A.; Emrich, R.; Goddard, R.; Jolly, P. W.; Krüger, C.; Romão, C. C.; Schönfelder, K. U.; Tsay, Y. H. Polyhedron 1993, 12, 2651-2662.
13. 2 would allow the metal centers to achieve formal 18-electron counts. The existence of such a bond is consistent with the chromium-chromium separation of 2.173(1) Å.
14. Overby, J. S.; Hanusa, T. P. Organometallics 1996, 15, 2205-2212.
15. 2i in toluene (Overby, J. S.; Hanusa, T. P. Unpublished results).
16. cor = 4.9 μB.
17. 7
18. -3 for fw = 454.48. Refinement of 1461 reflections collected at 293 K with Cu Kα radiation and I > 3.0σ(I) led to residuals of R1(F) = 0.046 and wR2(F) = 0.055.
19. Flower, K. R.; Hitchcock, P. B. J. Organomet. Chem. 1996, 507, 275-277.
20. Overby, J. S.; Schoell, N. J.; Hanusa, T. P. J. Organomet. Chem. 1998, 560, 15-19.
21. Castellani, M. P.; Geib, S. J.; Rheingold, A. L.; Trogler, W. C. Organometallics 1987, 6, 1703-1712.
22. Switzer, M. E.; Wang, R.; Rettig, M. F.; Maki, A. H. J. Am. Chem. Soc. 1974, 96, 7669-7674.
23. Ammeter, J. H.; Bucher, R.; Oswald, N. J. Am. Chem. Soc. 1974, 96, 7833-7835.
24. Hebendanz, N.; Köhler, F. H.; Müller, G.; Riede, J. J. Am. Chem. Soc. 1986, 108, 3281-3289.
25. Pauling, L. The Nature of the Chemical Bond, 3rd ed.; Cornell University Press: Ithaca, NY, 1960.
26. 2-Cr 21 kcal/mol below the energy of the low-spin (triplet) species (Hanusa, T. P. Unpublished results).