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Spin-crossover in cyanide-based bimetallic coordination polymers: insight from first-principles calculations
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2011 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 21, no 36, 13832-13840 p.Article in journal (Refereed) Published
Abstract [en]

Employing density functional theory (DFT) based calculations, we perform a computational investigation to unravel the intricate spin-crossover transitions that have been observed (Niel et al., Angew. Chem., Int. Ed., 2003, 42, 3760) in cyanide-based bimetallic coordination polymers, [Fe(pmd)-(H(2)O){M(CN)(2)}(2)]center dot H(2)O (M = Ag or Au and pmd pyrimidine). Our calculations provide an explanation for the observed temperature-induced low-spin (LS) to high-spin (HS) spin-crossover occurring in both Ag and Au hydrated networks due to Fe-N bond stretching, concomitant with charge re-distribution from Fe to the ligands. For dehydrated compounds, we find that relativistic effects in Au versus Ag lead to differences in the degree of covalent bonding, which in turn, gives rise to a differential behavior, viz. the Ag dehydrated network exhibits a LS-HS spin transition whereas the Au hydrated network remains in HS state. As a critical test of our first-principles study we propose to investigate a Cu-based bimetallic coordination polymer, which we predict to be in LS state.

Place, publisher, year, edition, pages
2011. Vol. 21, no 36, 13832-13840 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-159078DOI: 10.1039/c1jm11679gISI: 000294441300017OAI: oai:DiVA.org:uu-159078DiVA: diva2:442611
Available from: 2011-09-22 Created: 2011-09-21 Last updated: 2017-12-08Bibliographically approved

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Tarafder, KartickOppeneer, Peter M.

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