Journal article
Aftereffects in zeolite-encapsulated Co-57-complexes
Hyperfine interactions, v 113(1-4), pp 331-339
01 Jan 1998
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Tris(2,2'-bipyridyl)-Co-57(II) and bis(2,2':6',2 "-terpyridine)-Co-57(II) complexes were synthesised in the supercages of zeolite-Y in order to study the effect of molecular isolation on the aftereffects of the Co-57(EC)Fe-57 decay. As compared to the regular crystalline salts of the complex ions where, according to the emission Mossbauer spectra, the most abundant species is low-spin Fe-II, the molecular isolation in the zeolite resulted in a larger fraction of low-spin Fe-III and a varying amount of high-spin Fe2+ species. In the investigated temperature range, 20 K to 295 K, the majority of the changes was observed above 80 K. In the case of tris(2,2'-bipyridyl)-Co-57(II)-Y, the most characteristic change occurred in valence states, while for bis(2,2':6',2 "-terpyridine)-Co-57(II)-Y, the temperature dependence of the spin states was more prominent. The change in the low spin valence states is explained partly by donor-acceptor properties of the zeolite lattice. The variation in the high spin fraction is explained by radiation damage of the ligand sphere and/or fragmentation of the complex ion followed by incomplete recombination in the supercage. Molecular isolation itself did not seem to increase the chance of fragmentation (as a consequence of charge neutralization following Auger ionization) of these highly conjugated complex molecules.
Metrics
6 Record Views
Details
- Title
- Aftereffects in zeolite-encapsulated Co-57-complexes
- Creators
- Z HomonnayG VankoA VertesA NathH SpieringP Gutlich
- Publication Details
- Hyperfine interactions, v 113(1-4), pp 331-339
- Publisher
- Springer Nature
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:000076164300025
- Other Identifier
- 991019168406504721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Atomic, Molecular & Chemical
- Physics, Condensed Matter
- Physics, Nuclear