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SLOW PARAMAGNETIC RELAXATION OF SOME PSEUDO-TETRAHEDRAL FERROUS COMPOUNDS IN ZERO FIELD

Abstract : Slow (zero field)paramagnetic relaxation is reported for undiluted tetrahedral ferrous monomers for the first time. The Mössbauer spectra of Fe(2,9 di-CH3-phenanthroline)(NCS)2 and Fe(2,9 di-CH3 4,7 di-ø-phenanthroline) (NCS)2 exhibit magnetic hyperfine splitting in the range 20 K to 1.6 K while the corresponding chlorides are rapidly relaxing paramagnets at all temperatures in zero field. Low temperature susceptibility and Mössbauer results indicate that D changes sign from positive to negative from the Cl- to NCS- respectively with the foregoing ligands. Mössbauer spectra to 1.6 K confirm rapid paramagnetic relaxation for other pseudo-tetrahedral analogues (e.g. Fe(biquinoline)X2, X=Cl, NCS-). The slow relaxation is then peculiar to the 2,9 di-CH3-phenanthroline system.
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https://hal.archives-ouvertes.fr/jpa-00218680
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Submitted on : Monday, January 1, 1979 - 8:00:00 AM
Last modification on : Monday, January 1, 1979 - 8:00:00 AM
Long-term archiving on: : Thursday, April 29, 2010 - 8:49:38 PM

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W. Reiff, C. Nicolini, B. Dockum. SLOW PARAMAGNETIC RELAXATION OF SOME PSEUDO-TETRAHEDRAL FERROUS COMPOUNDS IN ZERO FIELD. Journal de Physique Colloques, 1979, 40 (C2), pp.C2-230-C2-232. ⟨10.1051/jphyscol:1979282⟩. ⟨jpa-00218680⟩

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