Photo-induced spin-transition: the role of the iron(II) environment distortion.
The [FeLn(NCS)2] iron(II) spin-crossover complexes cover a wide range of magnetic behaviour. Owing to the large number of known structural and magnetic data, this series is perfectly adapted to the investigation of the structure-magnetic properties relationship. In this paper we propose a new structural parameter, denoted Theta, which is used to correlate the features of the spin-crossover phenomena with the distortion of the iron environment. In particular, this parameter has shed light on the role of such distortion on the limiting temperature of photo-inscription, known as T(LIESST). A strong dependence of T(LIESST) on Theta is clearly demonstrated. The stronger the distortion the higher the T(LIESST) value. This structure-property dependence represents, for instance, a powerful tool to estimate the highest potential T(LIESST) value for a series of complexes. This limit in the [FeLn(NCS)2] series is estimated to be around 120 K, which probably prevents their use in any industrial application.
Marchivie
Mathieu
M
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), UPR CNRS 9048, Université Bordeaux I, 87 Av. de Docteur Schweitzer, F-33608 Pessac, France.
Guionneau
Philippe
P
Létard
Jean François
JF
Chasseau
Daniel
D
D004578:Electron Spin Resonance Spectroscopy; D005296:Ferrous Compounds / Q000737:chemistry*; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D013696:Temperature
D005296:Ferrous Compounds; D009942:Organometallic Compounds