. Bi and . Opph, Ph-Rad) 2 état haut spin Total atomic spin densities: 31 C .012216 32 C .014878 33 H

Y. Pey, M. Verdaguer, O. Kahn, J. Sletten, and J. P. Renard, Ferromagnetic transition in a bimetallic molecular system, Journal of the American Chemical Society, vol.108, issue.23, p.7428, 1986.
DOI : 10.1021/ja00283a059

J. S. Miller, Molecular/organic magenets-potential applications, Advanced Materials, vol.6, issue.4, p.322, 1994.
DOI : 10.1002/adma.19940060416

N. M. Atherton, Principles of Electron Spin Resonance Ellis Horwood PTR, 1993.

A. Isuoka, S. Murata, T. Sugawara, and H. Iwamura, Ferro- and antiferromagnetic interaction between two diphenylcarbene units incorporated in the [2.2]paracyclophane skeleton, Journal of the American Chemical Society, vol.107, issue.6, p.1786, 1985.
DOI : 10.1021/ja00292a068

D. A. Dougherty, Spin control in organic molecules, Accounts of Chemical Research, vol.24, issue.3, p.88, 1991.
DOI : 10.1021/ar00003a005

E. Lieb and D. C. Mattis, Ordering Energy Levels of Interacting Spin Systems, Journal of Mathematical Physics, vol.3, issue.4, p.749, 1962.
DOI : 10.1063/1.1724276

T. P. 21-radharkrishnan, Ground state spin of some molecules with unusual h??ckel molecular orbital degeneracy, Tetrahedron Letters, vol.32, issue.35, p.4601, 1993.
DOI : 10.1016/0040-4039(91)80050-G

T. Ishida and H. Iwamura, Bis[3-tert-butyl-5-(N-oxy-tert-butylamino)phenyl] nitroxide in a quartet ground state: a prototype for persistent high-spin poly[(oxyimino)-1,3-phenylenes], Journal of the American Chemical Society, vol.113, issue.11, p.4238, 1991.
DOI : 10.1021/ja00011a028

K. 34-matsuda, T. Yamagata, . Seta, H. Iwamura, and K. Hori, Control of the ???Superexchange??? Interaction through Diphenyl Sulfide 4,4???-Diyl Magnetic Coupler by Changing the Oxidation State and Conformation of the Sulfur Atom, Journal of the American Chemical Society, vol.119, issue.34, p.8058, 1997.
DOI : 10.1021/ja9643984

K. Torssell, 1H,2H,19F and 31P NMR and ESR investigations of aryl-t-butyl nitroxides, Tetrahedron, vol.33, issue.17, p.2287, 1977.
DOI : 10.1016/0040-4020(77)80017-3

P. Gerbier, C. Guerin, J. Le-bideau, and K. Vallé, Nitroxide-Substituted Phenylphosphonic Acid:?? A New Building Block for the Design and Study of Magnetic Layered Materials, Chemistry of Materials, vol.12, issue.2, p.264, 2000.
DOI : 10.1021/cm991139f

R. Harris, Nuclear Magnetic Resonance Spectroscopy, A Psicochemical View, 1987.

H. Heise, F. H. Köhler, F. Mota, J. J. Novoa, and J. Veciana, C NMR Spectroscopy, Journal of the American Chemical Society, vol.121, issue.41, p.9659, 1999.
DOI : 10.1021/ja991188t

R. S. Drago, Physical Methods in Chemistry Saunders, 1992.

T. 64-itoh, K. Matsuda, and H. Iwamura, A Triphenylamine Derivative with Threep-(N-tert-Butyl-N-oxylamino)phenyl Radical Units and Yet a Doublet Ground State, Angewandte Chemie International Edition, vol.38, issue.12, p.1791, 1999.
DOI : 10.1002/(SICI)1521-3773(19990614)38:12<1791::AID-ANIE1791>3.0.CO;2-5

T. 65-itoh, K. Matsuda, H. Iwamura, and K. Hori, -butylamino)phenyl]amine, -methyl, and -borane Have Doublet, Triplet, and Doublet Ground States, Respectively, Journal of the American Chemical Society, vol.122, issue.11, p.2567, 2000.
DOI : 10.1021/ja9920819

K. Yamaguchi, Ab initio molecular orbital calculations of effective exchange integrals between transition metal ions, Chemical Physics Letters, vol.143, issue.4, p.371, 1988.
DOI : 10.1016/0009-2614(88)87049-0

H. Y. Woo, H. So, and M. T. Pope, Trimetallo Derivatives of Lacunary 9-Tungstosilicate Heteropolyanions. 2. Isotropic NMR Shifts in Pyridine-Type Ligands Coordinated to the Paramagnetic 9-Tungsto-3-cuprio(II)silicate Anion, Journal of the American Chemical Society, vol.118, issue.3, p.621, 1996.
DOI : 10.1021/ja952515+

Y. Hosokoshi, Y. Nakazawa, and K. Inoue, and PIMNO, Physical Review B, vol.60, issue.18, p.12924, 1999.
DOI : 10.1103/PhysRevB.60.12924

I. Dasna, S. Golhen, L. Ouahab, O. Peña, N. Daro et al., A dimeric Cu(II) acetate complex containing axially coordinated p-pyridyl nitronyl nitroxide radicals: [CuII(CH3COO)2(NITpPy)]2, New Journal of Chemistry, vol.24, issue.11, p.903, 2000.
DOI : 10.1039/b004491l

N. Daro, P. Guionneau, S. Golhen, D. Chasseau, L. Ouahab et al., Aminoxyl radical substituted uranyl compounds, Inorganica Chimica Acta, vol.326, issue.1, p.47, 2001.
DOI : 10.1016/S0020-1693(01)00593-X

W. 76-fujita and K. Awaga, Room-Temperature Magnetic Bistability in Organic Radical Crystals, Science, vol.286, issue.5438, p.261, 1999.
DOI : 10.1126/science.286.5438.261

A. N. Hoden, B. T. Matthias, P. W. Anderson, and H. W. Lewis, New Low-Temperature Ferromagnets, Physical Review, vol.102, issue.6, p.1463, 1956.
DOI : 10.1103/PhysRev.102.1463

K. K. 85-klausmeyer, T. B. Rauchfuss, and S. R. Wilson, Stepwise Assembly of [(C5H5)4(C5Me5)4Co4Rh4(CN)12]4+, an ???Organometallic Box???, Angewandte Chemie International Edition, vol.37, issue.12, p.1694, 1998.
DOI : 10.1002/(SICI)1521-3773(19980703)37:12<1694::AID-ANIE1694>3.0.CO;2-0

P. A. Berseth, J. J. Sokol, M. P. Shores, J. L. Heinrich, and J. R. Long, Cage with a Face-Centered Cubic Geometry, Journal of the American Chemical Society, vol.122, issue.40, p.9655, 2000.
DOI : 10.1021/ja001991j

H. Oshio, O. Tamada, H. Onodera, T. Ito, and S. Tero-kubota, Cyanide-Bridged Iron???Copper Molecular Squares with Doublet and Quintet Spin Ground States, Inorganic Chemistry, vol.38, issue.25, p.5686, 1999.
DOI : 10.1021/ic990617l

K. R. 98-dumbar and R. A. Heintz, Chemistry of transition metal cyanide compounds: modern perspectivas dans Progress in Inorganic Chemistry, 1997.

L. Spiccia, (b) Rabis, Inorg. Chem. J.; Monfort, M, vol.33, p.4663, 1994.

C. Mukherjee, P. S. Maji, T. K. Mostafa, G. Mallah, T. Chaudhuri et al., The First Structurally Alternating Copper(II) Chain with Alternate Single End-on and End-to-End Azido Bridging:?? A Synthesis, Crystal Structure, and Low-Temperature Magnetic Study, Inorganic Chemistry, vol.39, issue.22, p.5147, 1618.
DOI : 10.1021/ic000507a

S. 104-trofimenko, Boron-Pyrazole Chemistry, Journal of the American Chemical Society, vol.88, issue.8, p.1842, 1966.
DOI : 10.1021/ja00960a065

S. 105-trofimenko and . Scorpionates, The Coordination Chemistry of Polypyrazolylborate Ligands Imperial Collage, 1999.

J. E. Wertz and J. Bolton, Electron spin resonance: Elementary Theory and Practical Applications, 1972.
DOI : 10.1007/978-94-009-4075-8

T. Oshiki, K. Mashima, S. I. Kawamura, K. Tani, and K. Kitaura, = Tris(3,5-dimethylpyrazol-1-yl)hydroborate), Bulletin of the Chemical Society of Japan, vol.73, issue.8, p.1735, 2000.
DOI : 10.1246/bcsj.73.1735

K. 113-nakamoto, Infrared and Raman Spectra of Inorganic and coordination Compounds, 1985.

D. F. Shriver, The Manipulation of Air-Sensitive Compounds Mc Graw-Hill, 1965.

J. Baker, G. A. Rushbrooke, G. S. Gilbert, and H. E. , High-Temperature Series Expansions for the Spin-?? Heisenberg Model by the Method of Irreducible Representations of the Symmetric Group, Physical Review, vol.135, issue.5A, p.1272, 1964.
DOI : 10.1103/PhysRev.135.A1272

E. J. Corey and A. Venkasteswarlu, Protection of hydroxyl groups as tert-butyldimethylsilyl derivatives, Journal of the American Chemical Society, vol.94, issue.17, p.6190, 1972.
DOI : 10.1021/ja00772a043