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On-surface coordination chemistry of planar molecular spin systems: novel magnetochemical effects induced by axial ligands
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2012 (English)In: CHEMICAL SCIENCE, ISSN 2041-6520, Vol. 3, no 11, 3154-3160 p.Article in journal (Refereed) Published
Abstract [en]

Paramagnetic transition-metal complexes assembled on surfaces are of great interest for potential applications in organic spintronics. The magnetochemical interactions of the spin of the metal centers with both ferromagnetic surfaces and optional axial ligands are yet to be understood. We use a combination of X-ray magnetic circular dichroism (XMCD) and quantum-chemical simulations based on density functional theory (DFT + U) to investigate these metal-organic interfaces with chemically tunable magnetization. The interplay between an optional axial ligand (NO, spin S = 1/2 or NH3, S = 0) and Ni and Co ferromagnetic surfaces affecting the spin of Co(II) tetraphenylporphyrin (d(7), S = 1/2), Fe(II) tetraphenylporphyrin (d(6), S = 1), Mn(II) tetraphenylporphyrin (d(5), S = 5/2) and Mn(II) phthalocyanine (d(5), S = 3/2) is studied. We find that the structural trans effect on the surface rules the molecular spin state, as well as the sign and strength of the exchange interaction with the substrate. We refer to this observation as the surface spin-trans effect.

Place, publisher, year, edition, pages
2012. Vol. 3, no 11, 3154-3160 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-188427DOI: 10.1039/c2sc20828hISI: 000311068100003OAI: oai:DiVA.org:uu-188427DiVA: diva2:577942
Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2012-12-17Bibliographically approved

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Tarafder, KartickOppeneer, Peter M.
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