Study of thermal spin crossover in [Fe(II)(isoxazole)6](BF4)2 with Mössbauer spectroscopy

A. Bhattacharjee, P.J. van Koningsbruggen, W. Hibbs, Joel S. Miller, P. Gütlich

Research output: Contribution to journalArticle

Abstract

57Fe Mössbauer spectroscopy of the mononuclear [Fe(II)(isoxazole)6](BF4) 2compound has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. A temperature-dependent spin transition curve has been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures in the 240-60K range during the cooling and heating cycle. The compound exhibits a temperature-dependent two-step spin transition phenomenon with Tsco (step 1) = 92 and Tsco (step2) = 191K. The compound has three high-spin Fe(II) sites at the highest temperature of study; among them, two have slightly different coordination environments. These two Fe(II) sites are found to undergo a spin transition, while the third Fe(II) site retains the high-spin state over the whole temperature range. Possible reasons for the formation of the two steps in the spin transition curve are discussed. The observations made from the present study are in complete agreement with those envisaged from earlier magnetic and structural studies made on [Fe(II)(isoxazole)6](BF4)2, but highlights the nature of the spin crossover mechanism.

Original languageEnglish
Article number406202
Number of pages10
JournalJournal of Physics: Condensed Matter
Volume19
Issue number40
DOIs
Publication statusPublished - 11 Sep 2007

Fingerprint

Isoxazoles
crossovers
Spectroscopy
spectroscopy
Temperature
Hot Temperature
Cooling
Heating
temperature
curves

Keywords

  • condensed matter
  • electrical
  • magnetic
  • optical

Cite this

@article{8dff1a02827641b2878d9235d2b1f89c,
title = "Study of thermal spin crossover in [Fe(II)(isoxazole)6](BF4)2 with M{\"o}ssbauer spectroscopy",
abstract = "57Fe M{\"o}ssbauer spectroscopy of the mononuclear [Fe(II)(isoxazole)6](BF4) 2compound has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. A temperature-dependent spin transition curve has been constructed with the least-square fitted data obtained from the M{\"o}ssbauer spectra measured at various temperatures in the 240-60K range during the cooling and heating cycle. The compound exhibits a temperature-dependent two-step spin transition phenomenon with Tsco (step 1) = 92 and Tsco (step2) = 191K. The compound has three high-spin Fe(II) sites at the highest temperature of study; among them, two have slightly different coordination environments. These two Fe(II) sites are found to undergo a spin transition, while the third Fe(II) site retains the high-spin state over the whole temperature range. Possible reasons for the formation of the two steps in the spin transition curve are discussed. The observations made from the present study are in complete agreement with those envisaged from earlier magnetic and structural studies made on [Fe(II)(isoxazole)6](BF4)2, but highlights the nature of the spin crossover mechanism.",
keywords = "condensed matter, electrical, magnetic, optical",
author = "A. Bhattacharjee and {van Koningsbruggen}, P.J. and W. Hibbs and Miller, {Joel S.} and P. G{\"u}tlich",
note = "Copyright 2008 Elsevier B.V., All rights reserved.",
year = "2007",
month = "9",
day = "11",
doi = "10.1088/0953-8984/19/40/406202",
language = "English",
volume = "19",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "40",

}

Study of thermal spin crossover in [Fe(II)(isoxazole)6](BF4)2 with Mössbauer spectroscopy. / Bhattacharjee, A.; van Koningsbruggen, P.J.; Hibbs, W.; Miller, Joel S.; Gütlich, P.

In: Journal of Physics: Condensed Matter, Vol. 19, No. 40, 406202, 11.09.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of thermal spin crossover in [Fe(II)(isoxazole)6](BF4)2 with Mössbauer spectroscopy

AU - Bhattacharjee, A.

AU - van Koningsbruggen, P.J.

AU - Hibbs, W.

AU - Miller, Joel S.

AU - Gütlich, P.

N1 - Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/9/11

Y1 - 2007/9/11

N2 - 57Fe Mössbauer spectroscopy of the mononuclear [Fe(II)(isoxazole)6](BF4) 2compound has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. A temperature-dependent spin transition curve has been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures in the 240-60K range during the cooling and heating cycle. The compound exhibits a temperature-dependent two-step spin transition phenomenon with Tsco (step 1) = 92 and Tsco (step2) = 191K. The compound has three high-spin Fe(II) sites at the highest temperature of study; among them, two have slightly different coordination environments. These two Fe(II) sites are found to undergo a spin transition, while the third Fe(II) site retains the high-spin state over the whole temperature range. Possible reasons for the formation of the two steps in the spin transition curve are discussed. The observations made from the present study are in complete agreement with those envisaged from earlier magnetic and structural studies made on [Fe(II)(isoxazole)6](BF4)2, but highlights the nature of the spin crossover mechanism.

AB - 57Fe Mössbauer spectroscopy of the mononuclear [Fe(II)(isoxazole)6](BF4) 2compound has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. A temperature-dependent spin transition curve has been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures in the 240-60K range during the cooling and heating cycle. The compound exhibits a temperature-dependent two-step spin transition phenomenon with Tsco (step 1) = 92 and Tsco (step2) = 191K. The compound has three high-spin Fe(II) sites at the highest temperature of study; among them, two have slightly different coordination environments. These two Fe(II) sites are found to undergo a spin transition, while the third Fe(II) site retains the high-spin state over the whole temperature range. Possible reasons for the formation of the two steps in the spin transition curve are discussed. The observations made from the present study are in complete agreement with those envisaged from earlier magnetic and structural studies made on [Fe(II)(isoxazole)6](BF4)2, but highlights the nature of the spin crossover mechanism.

KW - condensed matter

KW - electrical

KW - magnetic

KW - optical

UR - http://www.scopus.com/inward/record.url?scp=34648840572&partnerID=8YFLogxK

UR - http://iopscience.iop.org/0953-8984/19/40/406202/

U2 - 10.1088/0953-8984/19/40/406202

DO - 10.1088/0953-8984/19/40/406202

M3 - Article

AN - SCOPUS:34648840572

VL - 19

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

IS - 40

M1 - 406202

ER -