Interplay between spin crossover and exchange interaction in iron(lll) complexes

authored by

Roman Boča, Ivan Nemec, Ivan Šalitroš, Ján Pavlik, Radovan Herchel, Franz Renz

Abstract

In the dinuclear and polynuclear metal complexes exhibiting the low-spin (LS) tohigh-spin (HS) transition, the spin-crossover phenomenon interferes with the magneticexchange interaction. The latter manifests itself in forming spin-multiplets, which causes apossible overlap of the band originating in different reference spin states (LL, LH, HL, andHH). A series of dinuclear Fe(III) complexes has been prepared; the iron centers are linkedby a bidentate bridge (CN~, and diamagnetic metallacyanates {Fe(CN)₅(NO)},{Ni(CN) ₄}, {Pt(CN)₄}, and {Ag(CN)₂}). Magneticmeasurements confirm that the spin crossover proceeds on the thermal propagation. Thisinformation has been completed also by the Mossbauer spectral (MS) data. A theoreticalmodel has been developed that allows a simultaneous fitting of all available experimentaldata (magnetic susceptibility, magnetization, HS mole fraction) on a common set ofparameters.

Organisation(s)

Institute of Inorganic Chemistry

External Organisation(s)

Slovak University of Technology in Bratislava
Palacky University

Type

Article

Journal

Pure and applied chemistry

Volume

81

Pages

1357-1383

No. of pages

27

ISSN

0033-4545

Publication date

2009

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Chemistry, General Chemical Engineering

Electronic version(s)

https://doi.org/10.1351/PAC-CON-08-07-20 (Access: Unknown)