Unexpected Spin-Crossover and a Low-Pressure Phase Change in an Iron(II)/Dipyrazolylpyridine Complex Exhibiting a High-Spin Jahn–Teller Distortion

Complexes of manganese(III) and N-substituted salicylaldimines have been prepared of general formulae Mn(sal-NR)3 and Nn(sal-NR)2X (X = Cl, Br, OAc). The complexes show high-spin magnetic behaviour with small deviations of the susceptibilities from the Curie law. Complexes of the type Mn(salen)X(X = Br, I) have also been studied and these show somewhat larger deviations from Curie behaviour. It is difficult to interpret this Curie-Weiss behaviour with certainty, but it can be explained for the salen derivatives, in particular, in terms of very weak antiferromagnetic interactions. The visible and near-infrared spectra for all the complexes are assigned. A Jahn-Teller splitting of the d-d transition is observed. Comparison of the i.r. spectra of the M(sal)3 derivatives (M = CrIII, MnIII, and FeIII) in the region 700-250 cm-1 has enabled assignments of the v(M-O) modes to be made. The spectra suggest that a Jahn-Teller distortion is operative in the Mn(sal)3 complex.

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Structure Solution of the High-Pressure Phase of CuWO4and Evolution of the Jahn–Teller Distortion

Chemistry of Materials ◽

10.1021/cm201592h ◽

2011 ◽

Vol 23 (18) ◽

pp. 4220-4226 ◽

Cited By ~ 43

Author(s):

J. Ruiz-Fuertes ◽

A. Friedrich ◽

J. Pellicer-Porres ◽

D. Errandonea ◽

A. Segura ◽

...

Keyword(s):

High Pressure ◽

High Pressure Phase ◽

Teller Distortion ◽

Structure Solution ◽

Jahn Teller ◽

Jahn Teller Distortion ◽

Pressure Phase

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Jahn-Teller distortion, ferromagnetic coupling, and electron delocalization in a high-spin Fe–Fe bonded dimer

Comptes Rendus Chimie ◽

10.1016/j.crci.2011.09.001 ◽

2012 ◽

Vol 15 (2-3) ◽

pp. 192-201 ◽

Cited By ~ 15

Author(s):

George H. Timmer ◽

John F. Berry

Keyword(s):

High Spin ◽

Electron Delocalization ◽

Ferromagnetic Coupling ◽

Teller Distortion ◽

Jahn Teller ◽

Jahn Teller Distortion

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Light-induced relaxation dynamics of the ferricyanide ion revisited by ultrafast XUV photoelectron spectroscopy

Physical Chemistry Chemical Physics ◽

10.1039/c7cp01288h ◽

2017 ◽

Vol 19 (22) ◽

pp. 14248-14255 ◽

Cited By ~ 20

Author(s):

Nicholas Engel ◽

Sergey I. Bokarev ◽

Alexandre Moguilevski ◽

Azhr A. Raheem ◽

Ruba Al-Obaidi ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Spin Crossover ◽

Relaxation Dynamics ◽

Teller Distortion ◽

Jahn Teller ◽

Jahn Teller Distortion

The photoexcited ferricyanide undergoes an ultrafast spin crossover followed by Jahn–Teller distortion.

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Effect of Metal−Oxygen Covalent Bonding on the Competition between Jahn−Teller Distortion and Charge Disproportionation in the Perovskites of High-Spin d4Metal Ions LaMnO3and CaFeO3

Inorganic Chemistry ◽

10.1021/ic0110427 ◽

2002 ◽

Vol 41 (7) ◽

pp. 1920-1929 ◽

Cited By ~ 39

Author(s):

M.-H. Whangbo ◽

H.-J. Koo ◽

A. Villesuzanne ◽

M. Pouchard

Keyword(s):

High Spin ◽

Covalent Bonding ◽

Teller Distortion ◽

Charge Disproportionation ◽

Jahn Teller ◽

Jahn Teller Distortion

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Mössbauer-Spektroskopische Untersuchungen an der high/low spin Eisen(II)-Verbindung Cs2FeHFeL(CN)6 / Mössbauer Spectroscopic Investigation of the High/Low Spin Iron(II) Compound Cs2FeHFeL(CN)6

Zeitschrift für Naturforschung B ◽

10.1515/znb-1977-0907 ◽

1977 ◽

Vol 32 (9) ◽

pp. 992-997 ◽

Cited By ~ 2

Author(s):

W. D. Griebler ◽

J. Pebler ◽

K. Schmidt ◽

D. Babel

Keyword(s):

Magnetic Susceptibility ◽

Low Temperature ◽

Ir Spectra ◽

High Spin ◽

Spectroscopic Investigation ◽

Ir Absorption ◽

Teller Distortion ◽

Jahn Teller ◽

Jahn Teller Distortion ◽

High Spin Iron

By Mössbauer spectroscopy the cubic compound CsFe(CN)3, α = 5.208 Å, is shown to contain high and low spin iron(II) in 1:1 proportion independant of temperature 4.2 ≦ T ≦ 600 K. This gives evidence of isomorphism with the elpasolite Cs2MgFe(CN)6. The quadrupol splitting of the high spin iron(II) spectra strongly depends on temperature and vanishes beyond 400 K. This behaviour is interpreted in terms of static Jahn Teller distortion in the low temperature range, also indicated by the splitting of the IR absorption associated with the Fe-N stretching frequency.The data of Mössbauer and IR spectra, as well as of magnetic susceptibility measurements are given and discussed.

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