Complete spin crossover in the [Fe(pybzim)₃](ClO₄)₂ · H₂O complex

verfasst von

L. Dlháň, W. Linert, F. Renz, R. Boča

Abstract

The magnetic properties of a hexacoordinated Fe(II) complex with the bidentate ligand 2-(2-pyridyl)benzimidazole (pybzim) - [Fe(pybzim)₃](ClO₄)₂ · H₂O have been investigated by AC susceptometer measurements. The temperature dependence of the AC magnetic susceptibility for a powder sample showed essentially diamagnetic behaviour below 85 K and paramagnetism (μ_eff/μ_B = 4.5-5.3, S = 2) above 160 K, obeying the Curie - Weiss law. Spin crossover behaviour can be found within the temperature range of 90 to 160 K; it is centred at 141 K. The complex is ESR silent in X-band mode: neither the powder sample (77 K and 300 K) nor a methanol solution exhibit an ESR signal. The spin-crossover transition of a freshly prepared powder sample is complete. However, time evolution causes (within months) an increasing admixture of iron(III), which was proved by magnetic susceptibility measurement, ESR, and electron spectra of the complex.

Organisationseinheit(en)

Institut für Anorganische Chemie

Externe Organisation(en)

Slowakische Technische Universität Bratislava (STU)
Technische Universität Wien (TUW)

Typ

Artikel

Journal

Chemical papers

Band

51

Seiten

332-338

Anzahl der Seiten

7

ISSN

0366-6352

Publikationsdatum

1997

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Biochemie, Allgemeine Chemie, Allgemeine chemische Verfahrenstechnik, Wirtschaftsingenieurwesen und Fertigungstechnik, Werkstoffchemie