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RESEARCH PRODUCT

Mossbauer spectroscopic study of the thermal spin crossover in [Fe(II)(isoxazole)(6)](ClO(4))(2)

Ashis BhattacharjeePhilipp GütlichP.j. Van KoningsbruggenJoel S. Miller

subject

5-BIS(PYRIDIN-2-YL)-1Phase transitionMossbauer spectroscopySpin transition2Inorganic compoundsABPT=4-AMINO-3chemistry.chemical_compoundMOLECULESNuclear magnetic resonanceSpin crossoverMössbauer spectroscopyMagnetic propertiesPERCHLORATEGeneral Materials Science4-TRIAZOLEIsoxazoleSpin (physics)Mössbauer effectORDER-DISORDER PHENOMENABIS(3-AMINOPROPYL)(2-PYRIDYLMETHYL)AMINECOMPOUNDGeneral ChemistryAtmospheric temperature rangeCondensed Matter PhysicsSTATECrystallographychemistryPhase transitionsPHASE-TRANSITIONCondensed Matter::Strongly Correlated ElectronsCOMPLEXESLIGANDSABPT=4-AMINO-35-BIS(PYRIDIN-2-YL)-124-TRIAZOLE

description

The (57)Fe Mossbauer spectroscopy of mononuclear [Fe(II)(isoxazole)(6)](ClO(4))(2) has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states.Temperature-dependent spin transition curves have been constructed with the least-square fitted data obtained from the Mossbauer spectra measured at various temperatures between 84 and 270 K during a cooling and heating cycle. This compound exhibits an unusual temperature-dependent spin transition behaviour with T(C)(down arrow) = 223 and T(C)(up arrow) = 213 K occurring in the reverse order in comparison to those observed in SQUID observation and many other spin transition compounds. The compound has three high-spin Fe(II) sites at the highest temperature of study of which two undergo spin transitions. The Compound seems to undergo a structural phase transition around the spin transition temperature, which plays a significant role in the spin crossover behaviour as well as the magnetic properties of the compound at temperatures below T(C). The present study reveals an increase in high-spin fraction upon hearing in the temperature range below T(C) and an explanation is provided. (C) 2008 Elsevier Ltd. All rights reserved.

yearjournalcountryeditionlanguage
2008-11-01Journal of Physics and Chemistry of Solids
10.1016/j.jpcs.2008.06.141https://doi.org/10.1016/j.jpcs.2008.06.141