After-effects of the 57Co(EC)57Fe nuclear decay in tris(2,2′-bipyridyl)cobalt(II) encapsulated in the supercage of zeolite Y

G. Vankó, Z. Homonnay, Sándor Nagy, A. Vértes, Hartmut Spiering, Philipp Gütlich

Research output: Contribution to journalArticle

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Abstract

57Fe emission Mössbauer spectroscopy was used to study the after-effects of the 57Co(EC)57Fe decay in tris(bipy)cobalt(II) (bipy=2,2′-bipyridyl) encapsulated in the supercage of zeolite Y. The spectra revealed two low-spin species, [57Fe(bipy)3]2+ and [57Fe(bipy)3]3+, as well as a high-spin species of [57Fe(bipy)3]2+. An anomalously high spectral contribution of FeIII was found with an anomalous temperature dependence, i.e., the amount of FeIII diminished with the temperature elevation. A time-delayed Mössbauer experiment was performed to determine the time scale of this phenomenon, which indicated that the processes responsible for the FeIII to FeII transition was completed in the first nanoseconds after the nuclear decay. Another effect of the zeolite encapsulation was the absence of a second high-spin [57Fe(bipy)3]2+ species identified in pristine crystalline compounds as an excited ligand field state of Fe2+. This observation is attributed to the spatial restriction implied by the supercage. The possible fragmentation origin of the first high-spin [57Fe(bipy)3]2+ species, the complex ion with a damaged ligand, is also discussed.

Original languageEnglish
Pages (from-to)8472-8478
Number of pages7
JournalThe Journal of Chemical Physics
Volume108
Issue number20
Publication statusPublished - May 22 1998

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Zeolites
2,2'-Dipyridyl
Cobalt
cobalt
Ligands
Emission spectroscopy
decay
Encapsulation
Ions
Crystalline materials
Temperature
ligands
constrictions
fragmentation
Experiments
temperature dependence
spectroscopy
ions
temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

After-effects of the 57Co(EC)57Fe nuclear decay in tris(2,2′-bipyridyl)cobalt(II) encapsulated in the supercage of zeolite Y. / Vankó, G.; Homonnay, Z.; Nagy, Sándor; Vértes, A.; Spiering, Hartmut; Gütlich, Philipp.

In: The Journal of Chemical Physics, Vol. 108, No. 20, 22.05.1998, p. 8472-8478.

Research output: Contribution to journalArticle

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abstract = "57Fe emission M{\"o}ssbauer spectroscopy was used to study the after-effects of the 57Co(EC)57Fe decay in tris(bipy)cobalt(II) (bipy=2,2′-bipyridyl) encapsulated in the supercage of zeolite Y. The spectra revealed two low-spin species, [57Fe(bipy)3]2+ and [57Fe(bipy)3]3+, as well as a high-spin species of [57Fe(bipy)3]2+. An anomalously high spectral contribution of FeIII was found with an anomalous temperature dependence, i.e., the amount of FeIII diminished with the temperature elevation. A time-delayed M{\"o}ssbauer experiment was performed to determine the time scale of this phenomenon, which indicated that the processes responsible for the FeIII to FeII transition was completed in the first nanoseconds after the nuclear decay. Another effect of the zeolite encapsulation was the absence of a second high-spin [57Fe(bipy)3]2+ species identified in pristine crystalline compounds as an excited ligand field state of Fe2+. This observation is attributed to the spatial restriction implied by the supercage. The possible fragmentation origin of the first high-spin [57Fe(bipy)3]2+ species, the complex ion with a damaged ligand, is also discussed.",
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AU - Homonnay, Z.

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AU - Gütlich, Philipp

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