| 摘要 |
Chemical substances are provided which exhibit thermally induced spin transitions between two stable spin states at ambient temperature, said transitions being associated with a hysteresis phenomenon and resulting in an abrupt variation of the color of the molecules for realizing a medium for storing, processing and/or displaying information by way of thermal writing, optical reading and thermal erasing, a particular embodiment of such a medium comprising at least a layer of chemical substances including a lattice with a molecule comprising a metallic element Fe(II), or Fe(III) or Co(II) associated with at least one ligand chosen from the substituted triazoles which are defined by the formula: <IMAGE> in which R is H or an alkyl Cn H2n+1 or R is an amine group NL2 where L is H and an alkyl radical, said molecule also comprising one or several anions chosen, for example, from BF4-, ClO4-, Br-, Cl-, and the lattice containing a defined quantity of non-ligand water, ensured by the presence of a hygroscopic substance.
|
