Abstract
Some molecular/organic solids comprised of linear chains of alternating metallocenium donors (D) and cyanocarbon acceptors (A) with spin state S = 1/2 (⋅⋅⋅D⋅ + A⋅ - D⋅ + A⋅ - ⋅⋅⋅) exhibit cooperative magnetic phenomena, that is, ferro-, antiferro-, ferri-, and metamagnetism. For [Fe III (C 5 Me 5 ) 2 ]⋅ + [TCNE] - ⋅ (Me = methyl; TCNE = tetracyanoethylene), bulk ferromagnetic behavior is observed below the Curie temperature of 4.8 K. A model of configuration mixing of the lowest charge-transfer excited state with the ground state was developed to understand the magnetic coupling as a function of electron configuration and direction of charge transfer. This model predicts that ferromagnetic coupling requires stable radicals with a non-half-filled degenerate valence orbital and a charge-transfer excited state with the same spin multiplicity that mixes with the ground state. Ferromagnetic coupling must dominate in all directions to achieve a bulk ferromagnet. Thus, the primary, secondary, and tertiary structures are crucial considerations for the design of molecular/organic ferromagnets.
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Dates
Type | When |
---|---|
Created | 18 years, 10 months ago (Oct. 5, 2006, 5:21 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 12, 2024, 10:49 a.m.) |
Indexed | 3 weeks, 6 days ago (Aug. 6, 2025, 9:15 a.m.) |
Issued | 37 years, 5 months ago (April 1, 1988) |
Published | 37 years, 5 months ago (April 1, 1988) |
Published Print | 37 years, 5 months ago (April 1, 1988) |
@article{Miller_1988, title={Molecular/Organic Ferromagnets}, volume={240}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.240.4848.40}, DOI={10.1126/science.240.4848.40}, number={4848}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Miller, Joel S. and Epstein, Arthur J. and Reiff, William M.}, year={1988}, month=apr, pages={40–47} }