Susceptibility and Moessbauer study of an antiferromagnetically coupled admixed-intermediate spin state in Fe(TPP) (FSbF5)*C6H5F

Article abstract of DOI:10.1063/1.452552

Magnetic properties of the synthetic hexafluoroantimonate complex of iron (III) tetraphenylporphyrin, Fe(TPP) (FSbF5)*C6H5F, were studied by susceptibility and Moessbauer techniques.The measured effective magnetic moment varies from 1.7 β at 1.5 K to 4.14 β at 300 K.The data were analyzed with the Maltempo model combined with a mean field antiferromagnetictreatment.This analysis shows that the system is predominantly in the S=3/2 spin state (98percent) with an unusually small spin-orbit coupling constant <*>=79 cm^-1.The net interaction of a given spin with thethermal average of all the spins is (1.39 cm^-1)S*_T.Moessbauer spectra were recorded from 4.2 to 64 K in fields 0 to 6 T.The chemical shift δ=0.39 (Fe) mm/s and quadrupole splitting ΔE=4.29 mm/s are temperature independent and typical of ferric ions in the admixed-intermediate spin state.Moessbauer analysis confirms that the exchange interaction must couple many spins rather than forming spin pairs as seen in earlier work.The analysis also provides the rather low hyperfine coupling constant P/g_Nβ_N=28 T/unit spin, and contact constant κ=0.25.The spectra imply slow relaxation in fields greater than 4 T at 4.2 K, the rate increasing with increasing T and decreasing H.All Moessbauer and susceptibility data were fitted with a common parameter set; only the relaxation parameter was varied from one spectrum to another.

Full text of DOI:10.1063/1.452552

Susceptibility and Mössbauer study of an antiferromagnetically coupled admixed
intermediate spin state in Fe(TPP) (FSbF5)C6H5F
Govind P. Gupta, George Lang, Christopher A. Reed, Kenneth Shelly, and W. Robert Scheidt
Citation: The Journal of Chemical Physics 86, 5288 (1987); doi: 10.1063/1.452552
View online: http://dx.doi.org/10.1063/1.452552
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/86/10?ver=pdfcov
Published by the AIP Publishing
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
131.94.16.10 On: Mon, 22 Dec 2014 14:20:47

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
131.94.16.10 On: Mon, 22 Dec 2014 14:20:47

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
131.94.16.10 On: Mon, 22 Dec 2014 14:20:47

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
131.94.16.10 On: Mon, 22 Dec 2014 14:20:47

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
131.94.16.10 On: Mon, 22 Dec 2014 14:20:47