A field induced high-spin molecule

{Fe(II)-Fe(III)₆} cluster

authored by

L'ubor Dlháň, Milan Gembický, Radovan Herchel, Roman Boča, Franz Renz

Abstract

A blue heptanuclear complex [Fe^II{(CN)Fe^III(⁵L)}₆]Cl₂ resulted by combining the mononuclear precursor [Fe^III(⁵L)Cl] and [Fe(CN)₆]^4-. In the role of the pentadentate blocking ligand the Schiff-condensation product of 1,7-diamino-4-azaheptane with the salicyaldehyde has been used. The mixed-valence cluster has been characterized by its Mössbauer spectra and the powder diffraction patterns. The magnetization measurements until B = l T indicate S = 6 ground state. The susceptibility has been fitted with J/k = -0.0284 K, g = 1.825 when all 46656 magnetic states of the cluster are considered assuming that six s = 5/2 centers take part in the exchange coupling. With such a small exchange coupling constant the ground S = 0 molecular state is crossed by the Zeeman term so that the molecular ground state depends upon the magnetic field strength, progressively reaching the maximum value S = 15 for large field/temperature ratio.

External Organisation(s)

Slovak University of Technology in Bratislava
Johannes Gutenberg University Mainz

Type

Conference article

Journal

Solid State Phenomena

Volume

90-91

Pages

147-152

No. of pages

6

ISSN

1012-0394

Publication date

2003

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics, Materials Science(all), Condensed Matter Physics