Crystal Structures of Chiral Diastereoisomers of a Carbon-Based High-Spin Molecule

Angewandte Chemie - International Edition

Volumn 37, Issue 3, 1998, Pages 330-333

  Sedó, Josep ^a   Ventosa, Nora ^a   Ruiz Molina, Daniel ^a   Mas, Montserrat ^a   Molins, Elies ^a   Rovira, Concepció ^a   Veciana, Jaume ^a  

^a UNIVERSITAT AUTÒNOMA DE BARCELONA   (Spain)

Author keywords

Chirality; Helical structures; Isomerizations; Magnetic properties; Radicals

Indexed keywords

EID: 0032536571     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/(sici)1521-3773(19980216)37:3<330::aid-anie330>3.3.co;2-s     Document Type: Article

References (19)

1. For reviews on organic magnetic materials, see: a) J. S. Miller, A. J. Epstein, Angew. Chem. 1994, 106, 399; Angew. Chem. Int. Ed. Engl. 1994, 33, 385; b) O. Kahn, Molecular Magnetism, VCH, New York, 1993; Proceedings of the International Symposium on Chemistry and Physics of Molecular Based Magnetic Materials (Ed.: J. S. Miller), Salt Lake City, 1994; c) H. Iwamura, N. Koga, Acc. Chem. Res. 1993, 26, 346.
2. For reviews on organic magnetic materials, see: a) J. S. Miller, A. J. Epstein, Angew. Chem. 1994, 106, 399; Angew. Chem. Int. Ed. Engl. 1994, 33, 385; b) O. Kahn, Molecular Magnetism, VCH, New York, 1993; Proceedings of the International Symposium on Chemistry and Physics of Molecular Based Magnetic Materials (Ed.: J. S. Miller), Salt Lake City, 1994; c) H. Iwamura, N. Koga, Acc. Chem. Res. 1993, 26, 346.
3. For reviews on organic magnetic materials, see: a) J. S. Miller, A. J. Epstein, Angew. Chem. 1994, 106, 399; Angew. Chem. Int. Ed. Engl. 1994, 33, 385; b) O. Kahn, Molecular Magnetism, VCH, New York, 1993; Proceedings of the International Symposium on Chemistry and Physics of Molecular Based Magnetic Materials (Ed.: J. S. Miller), Salt Lake City, 1994; c) H. Iwamura, N. Koga, Acc. Chem. Res. 1993, 26, 346.
4. For reviews on organic magnetic materials, see: a) J. S. Miller, A. J. Epstein, Angew. Chem. 1994, 106, 399; Angew. Chem. Int. Ed. Engl. 1994, 33, 385; b) O. Kahn, Molecular Magnetism, VCH, New York, 1993; Proceedings of the International Symposium on Chemistry and Physics of Molecular Based Magnetic Materials (Ed.: J. S. Miller), Salt Lake City, 1994; c) H. Iwamura, N. Koga, Acc. Chem. Res. 1993, 26, 346.
5. For reviews on organic magnetic materials, see: a) J. S. Miller, A. J. Epstein, Angew. Chem. 1994, 106, 399; Angew. Chem. Int. Ed. Engl. 1994, 33, 385; b) O. Kahn, Molecular Magnetism, VCH, New York, 1993; Proceedings of the International Symposium on Chemistry and Physics of Molecular Based Magnetic Materials (Ed.: J. S. Miller), Salt Lake City, 1994; c) H. Iwamura, N. Koga, Acc. Chem. Res. 1993, 26, 346.
6. a) M. Kurmoo, A. W. Graham, P. Day, S. J. Coles, M. B. Hurtshouse, J. L. Caulfield, J. Singleton, F. L. Pratt, W. Hayes, L. Ducasse, P. Guionneau, J. Am. Chem. Soc. 1995, 117, 12209;
7. b) M. M. Wienk, R. A. J. Janssen, ibid. 1997, 119, 4492.
8. c) J. Sedó, D. Ruiz, J. Vidal-Gancedo, C. Rovira, J. Bonvoisin, J.-P. Launay, J. Veciana, Adv. Mater. 1996, 8, 748.
9. The combination of magnetic and certain optical properties in a given material can give rise to two distinct, but related phenomena - photomagnetism and magnetooptical effects. Photomagnetism may be described as the change in the magnetic response of a material that results from its exposure to electromagnetic radiation, whereas a magnetooptical effect is the effect that a magnetic material has on electromagnetic radiation. See: C. J. O'Connor in Molecular Magnetism: From Molecular Assemblies to the Devices (Eds.: E. Coronado, P. Delhaès, D. Gatteschi, J. S. Miller), Kluwer, Dordrecht, 1996, p. 521.
10. Magnetochiral dichroism and other magnetooptical effects have been predicted for molecules containing both magnetic and optically active centers. For theoretical background, see a) N. B. Baranova, Y. V. Bogdanov, B. Y. Zeldovich, Opt. Commun. 1977, 22, 243; b) L. D. Barren, J. Vrbancich, Mol. Phys. 1982, 93, 78. For recent experimental research, see c) R. Graziotti, D. K. Maude, G. Rikken, Annual Report of the Grenoble High Magnetic Field Laboratory 1996, 85.
11. Magnetochiral dichroism and other magnetooptical effects have been predicted for molecules containing both magnetic and optically active centers. For theoretical background, see a) N. B. Baranova, Y. V. Bogdanov, B. Y. Zeldovich, Opt. Commun. 1977, 22, 243; b) L. D. Barren, J. Vrbancich, Mol. Phys. 1982, 93, 78. For recent experimental research, see c) R. Graziotti, D. K. Maude, G. Rikken, Annual Report of the Grenoble High Magnetic Field Laboratory 1996, 85.
12. Magnetochiral dichroism and other magnetooptical effects have been predicted for molecules containing both magnetic and optically active centers. For theoretical background, see a) N. B. Baranova, Y. V. Bogdanov, B. Y. Zeldovich, Opt. Commun. 1977, 22, 243; b) L. D. Barren, J. Vrbancich, Mol. Phys. 1982, 93, 78. For recent experimental research, see c) R. Graziotti, D. K. Maude, G. Rikken, Annual Report of the Grenoble High Magnetic Field Laboratory 1996, 85.
13. a) O. Armet, J. Veciana, C. Rovira, J. Riera, J. Castañer, E. Molins, J. Rius, C. Miravitlles, S. Olivella, J. Brichfeus, J Phys. Chem. 1987, 97, 5608;
14. b) J. Veciana, C. Rovira, M. I. Crespo, O. Armet, V. M. Domingo, F. Palacio, J. Am. Chem. Soc. 1991, 113, 2552; J. Veciana, C. Rovira, L. Ventosa, M. I. Crespo, F. Palacio, ibid. 1993, 115, 57.
15. c) J. Veciana, C. Rovira, L. Ventosa, M. I. Crespo, F. Palacio, ibid. 1993, 115, 57.
16. K. Mislow, Acc. Chem. Res. 1976, 9, 26.
17. -3. Cryslallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-100586. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB21EZ, UK. Fax: Int. code +(49)1223336-033; e-mail: deposit@ccdc.cum.ac.uk.
18. This result is in contrast with other reports that show that large deviations from planarity change the spin preferences against the classical topology rule. See: a) S. Fang, M. S. Lee, D. A. Hrovat, W. T. Borden, J Am. Chem. Soc. 1995, 117, 6727; b) Z. Jingping, M. Baumgarten, Chem. Phys. Lett, 1997, 269, 187.
19. This result is in contrast with other reports that show that large deviations from planarity change the spin preferences against the classical topology rule. See: a) S. Fang, M. S. Lee, D. A. Hrovat, W. T. Borden, J Am. Chem. Soc. 1995, 117, 6727; b) Z. Jingping, M. Baumgarten, Chem. Phys. Lett, 1997, 269, 187.