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Your search keyword '"Barra , A.L"' showing total 2 results
Start Over Author "Barra , A.L" Journal journal of the american chemical society
2 results on '"Barra , A.L"'

1. Single-molecule magnet behavior of a tetranuclear iron(III) complex: the origin of slow magnetic relaxation in iron(III) clusters

Author

Barra, A.L., Caneschi, A., Cornia, A., Biani, F. Fabrizi de, Gatteschi, D., Sangregorio, C., Sessoli, R., and Sorace, L.

Subjects
Coordination compounds -- Research, Metal ions -- Research, Iron compounds -- Research, Magnetic materials -- Research, Anisotropy -- Research, Chemistry
Abstract

A study on the molecular clusters of magnetic transition metal ions presents the synthesis, structure and magnetic characterization of a tetranuclear iron (III) cluster of Fe4-(OCH3)6(dpm)6 where Hdpm = dipivaloylmethane. This cluster has a ground state of S = 5 and exhibits superparamagnetic-like behavior. It is suggested that this compound as a case history can elucidate the origin of magnetic anisotropy of iron(III) clusters and more generally show which criteria must be satisfied to achieve single-molecule magnets.

Published
1999

2. Characterization of a new tyrosyl free radical in Salmonella typhimurium ribonucleotide reductase with EPR at 9.45 and 245 GHz

Author

Allard, P., Barra, A.L., Andersson, K.K., Schmidt, P.P., Atta, M., and Graslund, A.

Subjects
Free radicals (Chemistry) -- Analysis, Salmonella typhimurium -- Research, Electron paramagnetic resonance spectroscopy -- Research, Chemistry
Abstract

The EPR spectra of a new type of tyrosyl free radical in ribonucleotide reductase (RNR) from Salmonella typhimurium have been obtained at 9.45 and 245 GHz. The results showed the similarity of the X-band EPR spectrum to that of the photosystem II tyrosyl radicals. The g-anisotropy has been found to be similar to that of the Escherichia coli RNR radical.

Published
1996

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