Triangular geometrical and magnetic motifs uniquely linked on a spherical capsule surface

Angewandte Chemie - International Edition

Volumn 44, Issue 25, 2005, Pages 3857-3861

  Müller, Achim ^a   Todea, Ana Maria ^a   Van Slageren, Joris ^b   Dressel, Martin ^b   Bögge, Hartmut ^a   Schmidtmann, Marc ^a   Luban, Marshall ^c   Engelhardt, Larry ^c   Rusu, Mariana ^d  

^a BIELEFELD UNIVERSITY   (Germany)

^b UNIVERSITY OF STUTTGART   (Germany)

^c IOWA STATE UNIVERSITY   (United States)

^d BABE BOLYAI UNIVERSITY   (Romania)

Author keywords

Magnetochemistry; Mixed valence compounds; Molybdenum; Polyoxometalates; Vanadium

Indexed keywords

MAGNETISM; MOLECULAR ORIENTATION; ORGANOMETALLICS; QUANTUM THEORY;

METAL CENTERS; SPHERICAL CAPSULE; SPIN CENTERS; STRUCTURAL UNITS;

MOLECULAR STRUCTURE;

EID: 21244456891     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200500697     Document Type: Article

References (36)

1. A. Müller, E. Beckmann, H. Bögge, M. Schmidtmann, A. Dress, Angew. Chem. 2002, 114, 1210-1215;
2. Angew. Chem. Int. Ed. 2002, 41, 1162-1167.
3. 30 which has the pentagonal units and encapsulated non-decomposed Keggin ions;
4. see b) A. Müller, S. K. Das, H. Bögge, M. Schmidtmann, A. Botar, A. Patrut, Chem. Commun. 2001, 657-658.
5. A. Müller, S. Roy, Coord. Chem. Rev. 2003, 245, 153-166.
6. A. Müller, S. Roy in The Chemistry of Nanomaterials: Synthesis, Properties and Applications (Eds.: C. N. R. Rao, A. Müller, A. K. Cheetham), Wiley-VCH, Weinheim, 2004, pp. 452-475.
7. a) A. Müller, P. Kögerler, C. Kuhlmann, Chem. Commun. 1999, 1347-1358;
8. b) A. Müller, P. Kögerler, A. W. M. Dress, Coord. Chem. Rev. 2001, 222, 193-218;
9. c) The related direct synthetic conditions, simply based on addition of the finally appearing linker to the relative medium, are reported herein for the first time. Earlier Keplerate syntheses were more complex.
10. 60)-type truncated icosahedron, it comprises not only equivalent vertices but also equivalent edges and equal dihedral angles (Figure 1); see a) M. O'Keeffe, B. G. Hyde, Crystal Structures, I. Patterns and Symmetry, Mineralogical Society of America, Washington, DC 1996;
11. b) H. S. M. Coxeter, Introduction to Geometry, Wiley, New York, 1989;
12. c) H. S. M. Coxeter, Regular Polytopes, 3rd ed., Dover, New York, 1973, in which we read (p. 18): "A quasi-regular polyhedron (like the icosidodecahedron) is defined as having regular faces, while its vertex figures, though not regular, are cyclic and equiangular (i.e., inscriptible in circles and alternate-sided). It follows from this definition that the edges are all equal, say of length 2L, that the dihedral angles are all equal, and that the faces are of two kinds, each face of one kind being entirely surrounded by faces of the other kind.");
13. d) A. Holden, Shapes, Space and Symmetry, Dover, New York, 1991.
14. a) A. Müller, S. Sarkar, S. Q. N. Shah, H. Bögge, M. Schmidtmann, Sh. Sarkar, P. Kögerler, B. Hauptfleisch, A. X. Trautwein, V. Schünemann, Angew. Chem. 1999, 111, 3435-3439;
15. Angew. Chem. Int. Ed. 1999, 38, 3238-3241;
16. b) D. Gatteschi, R. Sessoli, A. Müller, P. Kögerler in Polyoxometalate Chemistry: From Topology via Self-Assembly to Applications (Eds.: M. T. Pope, A. Müller), Kluwer, Dordrecht, 2001, pp. 319-328;
17. c) D. Gatteschi, Europhys. News 2003, 34(6), 214-216 (Magnetism Special Issue);
18. D. Gatteschi in Organic conductors, superconductors and magnets: from synthesis to molecular electronics (Eds.: L. Ouahab, E. Yagubskii), Kluwer, Dordrecht, 2004, pp. 179-196;
19. 2+ groups are also present (evidenced by ESR); these can, as usual, be easily integrated into the crystal-water lattice, which leads to a corresponding lower alkali cation concentration.
20. a) M. Axenovich, M. Luban, Phys. Rev. B 2001, 63, 100407;
21. b) C. Schröder, H. Nojiri, J. Schnack, P. Hage, M. Luban, P. Kögerler, Phys. Rev. Lett. 2005, 94, 017205;
22. c) A. Müller, M. Luban, C. Schröder, R. Modler, P. Kögerler, M. Axenovich, J. Schnack, P. Canfield, S. Bud'ko, N. Harrison, ChemPhysChem 2001, 2, 517-521.
23. When frustration originates purely from the geometry or topology of the lattice it is termed geometric frustration. The corresponding compounds are called geometrically frustrated antiferromagnetic materials (GFAF) and can have exotic magnetic ground states; see: a) J. Greedan, J. Mater. Chem. 2001, 11, 37-53;
24. b) Magnetic Systems with Competing Interactions (Ed.: H. Diep), World Scientific, Singapore, 1994;
25. c) Quantum Magnetism (Eds.: U. Schollwöck, J. Richter, D. J. J. Farnell, R. F. Bishop), Springer, Berlin, 2004;
26. d) Y. Narumi, K. Katsumata, Z. Honda, J.-C. Domenge, P. Sindzingre, C. Lhuillier, Y. Shimaoka, T. C. Kobayashi, K. Kindo, Europhys. Lett. 2004, 65, 705-711.
27. -3. (SHELXS/L, SADABS from G. M. Sheldrick, University of Göttingen 1997;
28. 2O ligand sphere was not considered in the formula. Further details on the crystal structure investigations may be obtained from the Fachinformationszentrum Karlsruhe, 76344 Eggenstein-Leopoldshafen, Germany (fax: (+49) 7247-808-666; e-mail: crysdata@fiz-karlsruhe.de), on quoting the depository number CSD-415055.
29. See for example, a) P. Kögerler, A. Müller in Polyoxometalate Molecular Science (Eds.: J. J. Borrás-Almenar, E. Coronado, A. Müller, M. T. Pope), Kluwer, Dordrecht, 2003, pp. 297-323;
30. b) A. Müller, F. Peters, M. T. Pope, D. Gatteschi, Chem. Rev. 1998, 98, 239-271.
31. A. Müller, B. Botar, H. Bögge, P. Kögerler, A. Berkle, Chem. Commun. 2002, 2944-2945.
32. A. Müller, S. K. Das, H. Bögge, M. Schmidtmann, M. Dressel, J. van Slageren, unpublished results.
33. 2)). in the low-temperature regime; χ is the zero-field susceptibility.
34. 14.4).
35. 57} type skeleton; see D. Gatteschi, R. Sessoli, W. Plass, A. Müller, E. Krickemeyer, J. Meyer, D. Sölter, P. Adler, Inorg. Chem. 1996, 35, 1926-1934.
36. 30} cluster. Full details will be published elsewhere.