Superparamagnetic-like properties of the valence-trapped Mn II Mn III 7Mn IV 4 anion in the salt (PPh4)[Mn12O12(O2CEt)16(H2O)4]
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 15,p. 1745-1746
- https://doi.org/10.1039/c39940001745
Abstract
Reduction of the 8MnIII,4MnIV complex [Mn12O12(O2CEt)16(H2O)3] with PPh4l in CH2Cl2 leads to isolation of (PPh4)[Mn12O12(O2CEt)16(H2O)4](3) whose crystal structure shows that the added electron is localized on a formerly MnIII ion to give a trapped-valence MnII,7MnIII,4MnIV situation; DC and AC magnetic susceptibility studies show that 3 has an S= 19/2 ground state and that it displays a superparamagnet-like non-zero, frequency-dependent, out-of-phase response in the AC susceptibility behaviour that is extremely unusual for a molecular species and unique for an ionic species.Keywords
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