Cooperative relaxation of the metastable states in the photomagnetic octacyanotungstate CsI[{CoII(3-CN-py)2}{WV(CN)8}] · H2O
Langue
en
Article de revue
Ce document a été publié dans
Chemical Physics Letters. 2006, vol. 426, n° 4-6, p. 380-386
Elsevier
Résumé en anglais
The metastable states of the Cs[{Co(3-cpy)2}{W(CN)8}] .H2O (3-cpy = 3-cyanopyridine) complex,, characterized by a CTIST phenomenon with a high-temperature phase formed by CoIIHS (S = 3/2)-NC-WV (S = 1/2) units and a ...Lire la suite >
The metastable states of the Cs[{Co(3-cpy)2}{W(CN)8}] .H2O (3-cpy = 3-cyanopyridine) complex,, characterized by a CTIST phenomenon with a high-temperature phase formed by CoIIHS (S = 3/2)-NC-WV (S = 1/2) units and a low-temperature phase formed by CoIIILS (S = 0)-NC-WIV (S = 0) units, have been induced at low temperature either by thermal quenching (RC state) or by irradiation (PI state). The T(TIESST) and T(LIESST) relaxation temperatures of RC and PI states, respectively, have been determined and the incompleteness of photo-excitation discussed. The presence of sigmoidal kinetics and the observation of LITH hysteresis loop under irradiation demonstrate the cooperative nature of the relaxation. The thermodynamic parameters have been determined and a simulation of the T(TIESST) curve done.< Réduire
Mots clés en anglais
Metastable states
Relaxation
LIESST
T(LIESST)
T(TIESST)
chemical compound
Octacyanotungstate
Photomagnetism
Origine
Importé de halUnités de recherche