A Moessbauer spectroscopy study of bis(acetylacetonato)iron(II): a novel example of slow paramagnetic relaxation of high-spin iron(II) in five- and six-coordination in zero field

1980 ◽  
Vol 19 (9) ◽  
pp. 2676-2679 ◽  
Author(s):  
Claudio Nicolini ◽  
William Michael Reiff
Keyword(s):  
High Spin ◽  
Paramagnetic Relaxation ◽  
Zero Field ◽  
Spectroscopy Study ◽  
Moessbauer Spectroscopy ◽  
High Spin Iron

Analysis of the EPR spectra of transferrin: the importance of a zero-field-splitting distribution and 4th-order terms

2019 ◽  
Vol 21 (31) ◽  
pp. 16937-16948 ◽  
Author(s):  
Mykhailo Azarkh ◽  
Peter Gast ◽  
Anne B. Mason ◽  
Edgar J. J. Groenen ◽  
Guinevere Mathies
Keyword(s):  
High Spin ◽  
Biological Systems ◽  
New Method ◽  
Epr Spectra ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Effective Use ◽  
High Spin Iron

A new method is implemented to extract the distribution of zero-field-splitting parameters from the EPR spectra of transferrin. This promotes the effective use of multi-frequency EPR to characterize high-spin iron sites in biological systems.

scholarly journals Spin states, bonding and magnetism in mixed valence iron(0)–iron(II) complexes

2021 ◽  
Author(s):  
Daniel Kim ◽  
Daniel Wilson ◽  
Majed Fataftah ◽  
Brandon Mercado ◽  
Patrick Holland
Keyword(s):  
High Spin ◽  
Computational Analysis ◽  
Mixed Valence ◽  
Lewis Base ◽  
Zero Field ◽  
Spin States ◽  
Iron Site ◽  
Zero Field Splitting ◽  
Structure Description ◽  
High Spin Iron

We report the synthesis of two complexes featuring unsupported Fe–Fe bonds between a diketiminate/dialdiminate-coordinated iron site and a cyclopentadienyl dicarbonyl iron site. Mössbauer spectroscopy, SQUID magnetometry and computational analysis indicate that the most accurate electronic structure description is with the Fe(CO)2Cp site as low spin iron(0), and it acts as a Lewis base toward the high spin iron(II) of the LFe fragment which is a Lewis acid. In both compounds, the three-coordinate high-spin iron(II) site has large zero-field splitting (zfs), up to D = –50 cm–1.

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