The high-spin (5T2) .dblharw. low-spin (1A1) transition in solid tris(2,2'-bi-2-imidazoline)iron(II) diperchlorate. Hysteresis effects, simultaneous change of spin and lattice characteristics, and order-disorder phenomena of the perchlorate anion

Koenig, E.; Ritter, G.; Kulshreshtha, S. K.; Nelson, S. M.

doi:10.1021/ic00138a020

Cited by 40 publications

(15 citation statements)

References 6 publications

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“…An anion or solvent order–disorder transition can also be disconnected from a spin transition, and this is manifest by the two events occurring over different temperature ranges 25. 26 In 1 , the order–disorder is coupled to the spin transition and so two Δ S vib contributions, Δ S vib (intra) and Δ S vib (latt), should be considered, the latter comprising the order–disorder transition. In 1 , the order–disorder transition in the anion is clearly coupled to the hydrogen‐bonding and thus the connectivity of the spin‐active d 4 ions.…”

Section: Representative Bond Lengths [å] and Distortion Parameters [°mentioning

confidence: 99%

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

et al. 2012

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Ein 8 K großes Hysteresefenster kennzeichnet den vollständigen, kooperativen Spinübergang in einem einkernigen MnIII‐Komplex. Raman‐Spektren, die beim Aufheizen und beim Abkühlen bei der gleichen Temperatur aufgenommen wurden, bestätigen die elektronische Bistabilität innerhalb der Hystereseschleife. Grund ist ein Ordnungs‐Unordnungs‐Übergang im PF6−‐Gegenion, der sich auf die H‐Brücken‐gebundenen 1D‐Ketten auswirkt, die benachbarte Kationen verbinden.

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Section: Representative Bond Lengths [å] and Distortion Parameters [°mentioning

confidence: 99%

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

et al. 2012

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“…On the other hand crystallographic studies are crucial to provide knowledge of the structural rearrangements occurring during the spin transition . Different kinds of phase transitions can accompany the spin crossover, for example, order–disorder transitions originating from the counteranions, − the solvent, − or some part of the ligand. ,− …”

Section: Introductionmentioning

confidence: 99%

Very Long-Lived Photogenerated High-Spin Phase of a Multistable Spin-Crossover Molecular Material

et al. 2018

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The spin-crossover compound [Fe( n-Bu-im)(tren)](PF) shows an unusual long relaxation time of 20 h after light-induced excited spin state trapping when irradiating at 80 K. This is more than 40 times longer than when irradiating at 10 K. Optical absorption spectroscopy, magnetometry, and X-ray diffraction using synchrotron radiation were used to characterize and explain the different relaxation behaviors of this compound after irradiation below and above 70 K. Rearrangement of the butyl chains of the ligands occurring during the relaxation after irradiation above 70 K is thought to be responsible for the unusually long relaxation time at this temperature.

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“…The homoleptic complex [Fe(bim)3] 2+ is known to exhibit only HS behavior [18], but combining the bidentate bim with the tetradentate bpte or tpma consistently leads to SCO in the heteroleptic complexes mentioned above. On the other hand, a hydrogenated derivative of bim, 2,2′-biimidazoline (bimz), affords a homoleptic Fe(II) complex that shows SCO around 110 K [19]. The [Fe(bimz)3] 2+ cation, however, is quite air-sensitive in solution, as well as in the solid state.…”

Section: Introductionmentioning

confidence: 99%

Pyridyl-Thioethers as Capping Ligands for the Design of Heteroleptic Fe(II) Complexes with Spin-Crossover Behavior

et al. 2021

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Mononuclear heteroleptic complexes [Fe(tpma)(bimz)](ClO4)2 (1a), [Fe(tpma)(bimz)](BF4)2 (1b), [Fe(bpte)(bimz)](ClO4)2 (2a), and [Fe(bpte)(bimz)](BF4)2 (2b) (tpma = tris(2-pyridylmethyl)amine, bpte = S,S′-bis(2-pyridylmethyl)-1,2-thioethane, bimz = 2,2′-biimidazoline) were prepared by reacting the corresponding Fe(II) salts with stoichiometric amounts of the ligands. All complexes exhibit temperature-induced spin crossover (SCO), but the SCO temperature is substantially lower for complexes 1a and 1b as compared to 2a and 2b, indicating the stronger ligand field afforded by the N2S2-coordinating bpte ligand relative to the N4-coordinating tpma. Our findings suggest that ligands with mixed N/S coordination can be employed to discover new SCO complexes and to tune the transition temperature of known SCO compounds by substituting for purely N-coordinating ligands.

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The high-spin (5T2) .dblharw. low-spin (1A1) transition in solid tris(2,2'-bi-2-imidazoline)iron(II) diperchlorate. Hysteresis effects, simultaneous change of spin and lattice characteristics, and order-disorder phenomena of the perchlorate anion

Cited by 40 publications

References 6 publications

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

Very Long-Lived Photogenerated High-Spin Phase of a Multistable Spin-Crossover Molecular Material

Pyridyl-Thioethers as Capping Ligands for the Design of Heteroleptic Fe(II) Complexes with Spin-Crossover Behavior

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