Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 25, Pages 7530-7535Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800693
Keywords
magnetic properties; manganese; monolayers; X-ray diffraction; X-ray magnetic circular dichroism
Categories
Funding
- BESSY
- FP6 Structuring the European Research Area Programme
- Integrated Infrastructure Initiative 'Integrating Activity on Synchrotron and Free Electron Laser Science- Contract R II [3-CT-2004-506008]
- NoE MAGMANet [NMP3-CT-2005-515767]
- QueMolNa [MRTN-CT-2003-504880]
- FIRB [RBNE033KMA]
- PRIN
- Italian CNR [PM.P05.011]
Ask authors/readers for more resources
The deposition of Mn-12 single molecule magnets on gold surfaces was studied for the first time using combined X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) methods at low temperature. The ability of the proposed approach to probe the electronic structure and magnetism of Mn-12 complexes without significant sample damage was successfully checked on bulk samples. Detailed information on the oxidation state and magnetic polarization of manganese ions in the adsorbates was obtained from XAS and XMCD spectra, respectively. Partial reduction of metal ions to Mn-II was clearly observed upon deposition on Au(111) of two different Mn-12 derivatives bearing 16-acetylthio-hexadecanoate and 4-(methyl-thio)benzoate ligands. The average oxidation state, as well as the relative proportions of Mn-II, Mn-III and Mn-IV species, are strongly influenced by the deposition protocol. Furthermore, the local magnetic polarizations are significantly decreased as compared with bulk Mnj, samples. The results highlight an utmost redox instability of Mn-12 complexes at gold surfaces, presumably accompanied by structural rearrangements, which cannot be easily revealed by standard surface analysis based on X-ray photoelectron spectroscopy and scanning tunnelling microscopy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available