Spin-Transition Polymers: From Molecular Materials Toward Memory Devices
10.1126/science.279.5347.44
Crossref journal-article
American Association for the Advancement of Science (AAAS)
Science (221)
Abstract

Some 3d n (4 ≤ n ≤ 7) transition metal compounds exhibit a cooperative transition between a low-spin (LS) and a high-spin (HS) state. This transition is abrupt and occurs with a thermal hysteresis, which confers a memory effect on the system. The intersite interactions and thus the cooperativity are magnified in polymeric compounds such as [Fe(Rtrz) 3 ]A 2 ·nH 2 O in which the Fe 2+ ions are triply bridged by 4-R-substituted-1,2,4-triazole molecules. Moreover, in these compounds, the spin transition is accompanied by a well-pronounced change of color between violet in the LS state and white in the HS state. The transition temperatures of these materials can be fine tuned, using an approach based on the concept of a molecular alloy. In particular, it is possible to design a compound for which room temperature falls in the middle of the thermal hysteresis loop. These materials have many potential applications, for example, as temperature sensors, as active elements of various types of displays, and in information storage and retrieval.

Bibliography

Kahn, O., & Martinez, C. J. (1998). Spin-Transition Polymers: From Molecular Materials Toward Memory Devices. Science, 279(5347), 44–48.

Authors 2
  1. O. Kahn (first)
  2. C. Jay Martinez (additional)
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Dates
Type When
Created 23 years ago (July 27, 2002, 5:42 a.m.)
Deposited 1 year, 7 months ago (Jan. 12, 2024, 11:57 p.m.)
Indexed 1 day, 12 hours ago (Aug. 21, 2025, 1:57 p.m.)
Issued 27 years, 7 months ago (Jan. 2, 1998)
Published 27 years, 7 months ago (Jan. 2, 1998)
Published Print 27 years, 7 months ago (Jan. 2, 1998)
Funders 0

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@article{Kahn_1998, title={Spin-Transition Polymers: From Molecular Materials Toward Memory Devices}, volume={279}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.279.5347.44}, DOI={10.1126/science.279.5347.44}, number={5347}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Kahn, O. and Martinez, C. Jay}, year={1998}, month=jan, pages={44–48} }