N-Substituted salicylaldimine complexes of manganese(III). Synthesis, magnetism, and spectra

1969 ◽  
Vol 22 (1) ◽  
pp. 39 ◽  
Author(s):  
A van den Bergen ◽  
KS Murray ◽  
MJ O'Conner ◽  
BO West
Keyword(s):  
High Spin ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Magnetic Behaviour ◽  
Teller Distortion ◽  
Small Deviations ◽  
Near Infrared Spectra ◽  
Jahn Teller ◽  
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.

A New One-Dimensional Bimetallic Complex: Cu(en)2Fe(CN)5(NO). Synthesis, Crystal Structure and Magnetic Behaviour

1998 ◽  
Vol 51 (8) ◽  
pp. 661 ◽  
Author(s):  
Hui-Zhong Kou ◽  
Hong-Mei Wang ◽  
Dai-Zheng Liao ◽  
Peng Cheng ◽  
Zong-Hui Jiang ◽  
...  
Keyword(s):  
Copper Complexes ◽  
Bond Distance ◽  
Chain Structure ◽  
Magnetic Behaviour ◽  
Teller Distortion ◽  
Magnetic Investigation ◽  
Jahn Teller ◽  
Cyanide Ligands ◽  
Jahn Teller Distortion ◽  
Shed Light

The nitrosyl cyanide Cu(en)2Fe(CN)5(NO) was prepared by the reaction of Cu(en)2Cl2 and Na2 [Fe(CN)5(NO)].2H2O in aqueous solution. Single-crystal X-ray structure analysis revealed that the complex assumes a cyanide-bridged chain structure in which iron(II) is coordinated by five cyanide ligands and a nitrosyl group, and copper(II) is coordinated by two ethylenediamine ligands and two bridging cyanide ligands. The copper centres display a typical Jahn–Teller distortion characteristic of octahedral copper complexes with bond distance deviations in lattice symmetry from octahedral ideality: Cu-N(equatorial, mean) 2·010(3) Å and Cu-N(axial, mean) 2·569(3) Å. Infrared and ultraviolet studies shed light on the above molecular structure. A magnetic investigation showed the presence of a weak antiferromagnetic interaction (J = -1·06 cm-1) between the copper atoms within each chain through the diamagnetic Fe(CN)5(NO)2- ions.

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

2015 ◽  
Vol 54 (13) ◽  
pp. 6319-6330 ◽  
Author(s):  
Laurence J. Kershaw Cook ◽  
Flora L. Thorp-Greenwood ◽  
Tim P. Comyn ◽  
Oscar Cespedes ◽  
Guillaume Chastanet ◽  
...  
Keyword(s):  
Phase Change ◽  
High Spin ◽  
Spin Crossover ◽  
Low Pressure ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion ◽  
Pressure Phase

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

1977 ◽  
Vol 32 (9) ◽  
pp. 992-997 ◽  
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.

Solid solutions of a Jahn-Teller compound in an undistorted host. 2. High-Spin, Six-Coordinate Cr2+ without Jahn-Teller Distortion

1991 ◽  
Vol 598 (1) ◽  
pp. 53-70 ◽  
Author(s):  
F. Albert Cotton ◽  
Larry R. Falvello ◽  
E. Lanelle Ohlhausen ◽  
Carlos A. Murillo ◽  
Jaime F. Quesada
Keyword(s):  
High Spin ◽  
Solid Solutions ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion
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