Thermally and optically induced spin transition effect on the structure ofiron(II) polymeric complexes

Citation
Sb. Erenburg et al., Thermally and optically induced spin transition effect on the structure ofiron(II) polymeric complexes, J SYNCHROTR, 6, 1999, pp. 576-578
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SYNCHROTRON RADIATION
ISSN journal
09090495 → ACNP
Volume
6
Year of publication
1999
Part
3
Pages
576 - 578
Database
ISI
SICI code
0909-0495(19990501)6:<576:TAOIST>2.0.ZU;2-X
Abstract
Polymeric iron(II) complexes of the composition Fe(atrz)(3)A(2), where atrz = 4-amino-1,2,4-triazole, A = anions, have been synthesized and characteri zed. The compounds exhibit an abrupt thermally driven spin transition (S=0 - S=2) at temperatures varying from 175 K to 400 K depend on composition. X AFS measurements were performed at the VEPP-3 storage ring at the Budker In stitute of Nuclear Physics in Novosibirsk. In all studied compounds the Fe- N and Fe-C interatomic distances increase upon the thermally induced transi tion to the high spin (HS) state by amounts from 0.12 Angstrom to 0.24 Angs trom. The existence of long-life optically excited metastable HS states was established for the Fe(atrz)(3)(ClO4)(2) at 4.2 K. The changes in structur e upon the transition to a metastable HS state differ from those in the the rmally induced spin transition.