Unusual spin transition behavior in 2,6-bis((pyrazol-3-yl)-pyridine) iron(II)-bis-oxalato-platinate(II)

C Matthias Grunert; Harold A Goodwin; Chiara Carbonera; Jean-François Létard; Joachim Kusz; Philipp Gütlich

doi:10.1021/jp068774a

Unusual spin transition behavior in 2,6-bis((pyrazol-3-yl)-pyridine) iron(II)-bis-oxalato-platinate(II)

J Phys Chem B. 2007 Jun 21;111(24):6738-47. doi: 10.1021/jp068774a. Epub 2007 Apr 17.

Authors

C Matthias Grunert¹, Harold A Goodwin, Chiara Carbonera, Jean-François Létard, Joachim Kusz, Philipp Gütlich

Affiliation

¹ Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Staudingerweg 9, D-55099 Mainz, Germany.

PMID: 17439168
DOI: 10.1021/jp068774a

Abstract

[Fe(bpp)2][Pt(ox)2].H2O (with bpp=2,6-bis(pyrazol-3-yl)-pyridine and ox=oxalate) was prepared, and its spin crossover behavior was characterized. The two-step spin transition behavior changes over several cycles. The original behavior is restored when the sample is allowed to relax for a week. Furthermore, the ST exhibits a strong dependence on the heating and cooling rate. Heating the compound at 1 K/min leads to a spin transition with a third step and a second plateau at gammaHS approximately 0.8. Quenching the sample to 77 K also affects the spin transition behavior. The kinetic relaxation is followed after quenching and after light-induced excited spin state trapping experiments.