A study of the electronic spin-state crossover in {Fe[HC(3,4,5-Me pz)]}(BF)

Citation data:

European Journal of Inorganic Chemistry, ISSN: 1434-1948, Vol: 2004, Issue: 16, Page: 3345-3352

Publication Year:
2004
Usage 1
Abstract Views 1
Citations 17
Citation Indexes 17
Repository URL:
http://scholarsmine.mst.edu/chem_facwork/132
DOI:
10.1002/ejic.200300973
Author(s):
Reger, Daniel L.; Elgin, J. Derek; Smith, Mark D.; Grandjean, Fernande; Rebbouh, Leïla; Long, Gary J.
Publisher(s):
Wiley; John Wiley & Sons
Tags:
Chemistry; Boron Derivative; Fluorine Derivative; Iron; Acceleration; Cooling; Hysteresis; Magnetism; Mössbauer Spectroscopy; Phase Transition; Structure Analysis; Synthesis; Temperature Measurement; X Ray Crystallography; Magnetic Properties; N Ligands; Spin Crossover; Boron Derivative; Fluorine Derivative; Iron; Acceleration; Cooling; Hysteresis; Magnetism; Mössbauer Spectroscopy; Phase Transition; Structure Analysis; Synthesis; Temperature Measurement; X Ray Crystallography; Magnetic Properties; N Ligands; Spin Crossover
article description
The synthesis, structural, magnetic, and Mössbauer spectroscopic properties of {Fe[HC(3,4,5-Mepz)]}(BF ) are reported. The single-crystal X-ray structure results indicate that at 150 K {Fe[HC(3,4,5-Mepz) ]2}(BF) has a structure which is very similar to that observed at 220 K for the trigonally distorted octahedral, high-spin {Fe[HC(3,5-Mepz)]}(BF ) complex. Both the magnetic and Mössbauer spectroscopic results indicate that {Fe[HC(3,4,5-Mepz) ]}(BF) is high spin between 160 and 296 K. Upon cooling, {Fe[HC(3,4,5-Mepz)] }(BF) exhibits a complete electronic spin-state crossover from the high-spin to the low-spin state at approximately 110 K and remains completely low spin down to 4.2 K; upon subsequent warming from 4.2 K, the transition from the low-spin to the high-spin state occurs at 148 to 150 K. {Fe[HC(3,4,5-Mepz)]}(BF ) exhibits a rather large thermal hysteresis of 38 K in its spin-state crossover. Thus, {Fe[HC(3,4,5-Mepz)] }(BF) behaves differently from both {Fe[HC(3,5-Mepz)]}(BF) which is known to show a unique spin-state crossover of one-half of its iron(II) ions associated with a phase transition, and Fe[HB(3,4,5-Me pz)], which is known to remain high-spin even upon cooling to 1.7 K. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.