Spin transition material
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United States of America Patent
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Apr 29, 2014
Grant Date -
Jul 15, 2010
app pub date -
Jun 11, 2008
filing date -
Jun 12, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A material is composed of at least one spin transition compound that corresponds to the formula Fe1-mMm(R-Trz)3XbYc (I) in which M is a metal having a 3d4, 3d5, 3d6 or 3d7 configuration, other than Fe; 0≦m≦1; R-Trz represents a 1,2,4-triazole ligand carrying an R substituent on the nitrogen in the 4 position; R is an alkyl group or an R1R2N— group in which R1 and R2 represent, each independently of the other, H or an alkyl radical; X represents at least one noncoloring monovalent or divalent anion; Y represents at least one anion which has a coloring group; and b and c are chosen so that the electrical neutrality of the compound (I) is adhered to. A process for the preparation of this material and to its use as thermochromic pigment, as support for data storage or as optical limiter.
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