Ein thermisch induzierter Spinübergang an einem Eisen(II)‐Komplex mit einer 70 K breiten Hystereseschleife

Weber, Birgit; Bauer, Wolfgang; Obel, Jaroslava

doi:10.1002/ange.200802806

Cited by 56 publications

(27 citation statements)

References 36 publications

(14 reference statements)

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“…K to a value of 2.89 cm 3 Kmol -1 at 20 K. The susceptibility data above 20 K can be fitted very well with the Curie-Weiss law (χ M = C/(T -Θ )) with the parameters Θ = -7.5 K and C = 3.50 cm…”

Section: Magnetic Propertiesmentioning

confidence: 74%

“…Upon cooling, the χ M T product decreases from a value of 3.32 cm 3 Kmol -1 at 300 K to a value of 1.33 cm 3 Kmol -1 at 20 K. The room temperature value is in the region typical for an iron(II) HS complex. The temperature-dependent decrease of the χ M T product is an indication for significantly stronger antiferromagnetic interactions compared to 2.…”

Section: Magnetic Propertiesmentioning

confidence: 88%

“…For compound 2 (top of Figure 6) nearly ideal curie behaviour is observed. Upon cooling, the χ M T product decreases from a value of 3.45 cm 3 Kmol -1 at 295…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…For a better understanding of the magnetic properties it is necessary to investigate the hydrogen bond network in the crystal packing. Previous investigations on this substance class did demonstrate that Hbonds influence the strength of cooperative interactions in spin transition complexes [3] or can introduce long range magnetic ordering.…”

Section: Description Of the X-ray Structuresmentioning

confidence: 99%

“…With regard to this we recently characterised an iron(II) spin crossover complex with a 70 K wide thermal hysteresis loop around room temperature based on a 2D network of hydrogen bonds between the complex molecules. [3] Systematic investigations on the magnetic properties of iron(II) complexes of this ligand systems demonstrated that hydrogen bonds are also the foundation for long range magnetic ordering. [4] As consequence of this finding we designed a new ligand based on 4,5-diaminocatechol with two additional hydroxyl groups at the phenyl ring that can act as H-bond donors/acceptors.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Weber

Obel

2009

Zeitschrift anorg allge chemie

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Section: Magnetic Propertiesmentioning

confidence: 74%

Section: Magnetic Propertiesmentioning

confidence: 88%

“…For compound 2 (top of Figure 6) nearly ideal curie behaviour is observed. Upon cooling, the χ M T product decreases from a value of 3.45 cm 3 Kmol -1 at 295…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Description Of the X-ray Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Weber

Obel

2009

Zeitschrift anorg allge chemie

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Four‐Site Cooperative Spin Crossover in a Mononuclear Fe^II Complex

et al. 2012

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Four-site cooperative spin crossover (SCO) in a mononuclear Fe(II) complex has been observed for the isoselenocyanate complex [(bpte)Fe II (NCSe) 2 ] (bpte = S,S'-bis(2-pyridylmethyl)-1,2-thioethane). The compound has been characterised in four polymorphic crystalline phases. One is SCO-inactive (b phase), one exhibits one-step SCO (g phase) and two exhibit four-site cooperative SCO (a and d phases) as a function of temperature. Crystal structures have been determined over the temperature range 300-100 K for all four polymorphs, and at intervals of 5 K for the most interesting a and d phases. Of the five potentially addressable local spin configurations in a four-site cooperative system, four are observed as ordered crystal structures amongst the polymorphs. The d phase exhibits a remarkable ordered 1HS:3LS structure (HS = high-spin Fe(II), LS = low-spin Fe(II)) below ca 130 K, which establishes conclusively the four-site cooperative nature of the system. The a and d phases are polytypes, but it is difficult to link conclusively the associated two-dimensional structural similarity with the four-site cooperativity. Keywords: spin crossover; polymorphism; magnetism MS27-O4 Synthesis and crystal structure of few new decavanadates. Wieslaw £asocha ab , Vanadates and peroxovanadates are used as valuable catalysts. They can be also applied in medicine thanks to their enzymo-imitative properties. During our studies of new peroxo-vanadates and poli-vanadates we have synthesized three new compounds which belong to the group of deca-vanadates: two organic decavanadates and a rubidium decavanadate. The obtained compounds have the same, island-like type of anion, which is built of VO 6 octahedra. The structure of deca-vanadates can be described on the basis of the structures of b-octamolybdates. If in a-octamolybdate anion, Mo(VI) ions are replaced by V(V) ions V 8 O 26-12 ions will be obtained. When to the V 8 O 26 12 ion two VO 6 octahedra (or VO 3+ after removal of the redundant O atoms) are attached V 10 O 28 6-anion is created. The syntheses were carried out in 30% H 2 O 2. After crystallization, which lasted several days, deca-vanadates without O 2-2 groups were obtained. Explanation of this phenomenon will be the subject of our further research. Lattice parameters and chemical formulas of the obtained compounds: 1. Rb 6 V 10 O 28 .8H 2 O: P2 1 /c, 13.974, 10.595, 34.291 Å, 90, 97.437, 90°, V= 5034.23 Å 3 , Z=6. 2. 5(1-ammoniumpropane)(H 3 O +)V 10 O 28 .H 2 O, P-1, 14.507, 15.502, 15.858Å, 88.22, 81.53, 83.94°, V=3507.21Å 3. Z=3, 3. 2(1,2-diammoniumpropane).2(H 3 O +)V 10 O 28 .4H 2 O, P-1, 8.636, 10.394, 10.959Å, 68.86, 78.92, 66.99°, V= 843.Å 3 .Z=1. Fig. 1. Asymmetric unit of compound 3. Properties and geometry of the synthesized compounds will be compared with the properties and structures of several decavanadates described in a comprehensive survey recently published [1]. The investigated compounds form complex structures often with several molecules in an asymmetric unit. For example, in the structure of the de...

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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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Ein thermisch induzierter Spinübergang an einem Eisen(II)‐Komplex mit einer 70 K breiten Hystereseschleife

Cited by 56 publications

References 36 publications

Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Four‐Site Cooperative Spin Crossover in a Mononuclear Fe^II Complex

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

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Ein thermisch induzierter Spinübergang an einem Eisen(II)‐Komplex mit einer 70 K breiten Hystereseschleife

Cited by 56 publications

References 36 publications

Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Synthesis and Characterisation of a New Schiff‐Base‐like Ligand and its Iron(II) Complexes

Four‐Site Cooperative Spin Crossover in a Mononuclear FeII Complex

Cooperative Spin Transition in a Mononuclear Manganese(III) Complex

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Resources

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Four‐Site Cooperative Spin Crossover in a Mononuclear Fe^II Complex