Study of the high-temperature spin-state crossover in the iron(II) pyrazolylborate complex Fe[HB(pz)3]2

Grandjean, Fernande; Long, Gary J.; Hutchinson, Bennett; Ohlhausen, LaNelle; Neill, P.; Holcomb, J. David

doi:10.1021/ic00323a024

Cited by 81 publications

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“…Grinding the sample has the same effect in the magnetic profile as subjecting the crystals to one heating/cooling cycle (Figure S3, b)). A similar magnetic behaviour was reported for the Fe II [Fe{HB(pz) 3 } 2 ] compound on several occasions,, , however, in those cases, the crystals were obtained in situ through sublimation techniques. The loss of the hysteresis is explained by two distinct factors: (1) the spin transition is accompanied by a phase transition that results in crystal fragmentation due to elastic strain in the lattice.…”

Section: Resultssupporting

confidence: 78%

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Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

et al. 2018

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Section: Resultssupporting

confidence: 78%

“…To the best of our knowledge, crystal fragmentation in SCO systems has been previously observed and reported by very few other authors …”

Section: Introductionmentioning

confidence: 81%

Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

et al. 2018

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“…fig. Other examples for the influence of pressure on the spin transition have been reported by other groups [29][30][31]. With decreasing iron concentration the spin transition becomes more gradual and approaches finally the simple Boltzmann population of the vibronic manifold of the HS state.…”

Section: -Thermal Spin-crossovermentioning

confidence: 63%

Fascinating electronic games in iron complexes

Gütlich

Jung

1996

Il Nuovo Cimento D

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Coordination compounds of transition metal ions with open-shell electron configurations may exhibit dynamic electronic-structure phenomena, depending on the nature of the coordinating ligand sphere. The change of spin state with temperature (,,thermal spin-crossover,,), light-induced electron transfer processes leading to long-lived metastable charge and spin states (e.g., ,,LIESST, effect), are some of the fascinating electronic games encountered in transition metal compounds, which are presently under extensive study by chemists and physicists. M5ssbauer spectroscopy plays a dominant role in the investigation of such phenomena in iron compounds, as will be demonstrated in this paper. This work will focus on selected examples of ~,thermal spin-crossover~ in iron(II) complexes and switching between different spin states by irradiation with light of different wavelength (LIESST effect), demonstrating that M5ssbauer spectroscopy besides other physical techniques proves to be a highly elegant tool for following the spin state conversion and the concomitant changes of molecular and crystal structure properties. Finally, M5ssbauer emission spectroscopy, both time integral and time differential, has been employed to generate and identify long-lived excited spin states by making use of the nuclear disintegration of 57Co as an intrinsic molecular light source (NIESST=nuclear decay-induced excited-spin-state trapping). Lifetime measurements by optical techniques on LIESST states and by timedifferential M5ssbauer coincidence spectroscopy on NIESST states prove that the relaxation pathways in the mechanisms for LIESST and NIESST are identical.PACS 71.70.Ch -Crystal and ligand fields. PACS 76.80 -MSssbauer effect; other 7-ray spectroscopy. PACS 78.40 -Visible and ultraviolet spectra.

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“…[8,11] The solution phase 1 H NMR spectrum is broad with chemical shifts ranging from 41 to Ϫ43 ppm, a range that is indicative of a paramagnetic high-spin iron() complex.…”

Section: Synthesismentioning

confidence: 99%

A Study of the Electronic Spin‐State Crossover in {Fe[HC(3,4,5‐Me₃pz)₃]₂}(BF₄)₂

et al. 2004

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Study of the high-temperature spin-state crossover in the iron(II) pyrazolylborate complex Fe[HB(pz)3]2

Cited by 81 publications

References 7 publications

Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

Fascinating electronic games in iron complexes

A Study of the Electronic Spin‐State Crossover in {Fe[HC(3,4,5‐Me₃pz)₃]₂}(BF₄)₂

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Study of the high-temperature spin-state crossover in the iron(II) pyrazolylborate complex Fe[HB(pz)3]2

Cited by 81 publications

References 7 publications

Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

Irreversible Magnetic Behaviour Caused by the Thermosalient Phenomenon in an Iron(III) Spin Crossover Complex

Fascinating electronic games in iron complexes

A Study of the Electronic Spin‐State Crossover in {Fe[HC(3,4,5‐Me3pz)3]2}(BF4)2

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A Study of the Electronic Spin‐State Crossover in {Fe[HC(3,4,5‐Me₃pz)₃]₂}(BF₄)₂