Abstract
The first trigonal bipyramidal Fe(ii) complex to display slow relaxation of magnetisation has been isolated, with this behaviour found to arise through a combination of a large magnetic anisotropy (D = -27.5 cm-1) and a pseudo-D3h symmetry at the Fe(ii) centre, as investigated through ab initio and magnetic studies.
Highlights
The first trigonal bipyramidal Fe(II) complex to display slow relaxation of magnetisation has been isolated, with this behaviour found to arise through a combination of a large magnetic anisotropy (D = À27.5 cmÀ1) and a pseudo-D3h symmetry at the Fe(II) centre, as investigated through ab initio and magnetic studies
For example in cases where an uneven number of electrons reside in degenerate orbitals, as is the case with Ni(II) [or Fe(II)] in a trigonal bipyramidal (TBP) coordination environment, if antagonistic Jahn–Teller distortions can be minimised through the judicious choice of ligands a ‘giant’ magnetic anisotropy can be induced.[8,9]
In light of the potential to induce a large magnetic anisotropy in TBP Fe(II) using this strategy, and the interest in the magnetic properties of monometallic Fe(II) complexes,[13,14,15,16,17] we report the synthesis of [FeCl3(MDABCO)2][ClO4] (1)
Summary
The first trigonal bipyramidal Fe(II) complex to display slow relaxation of magnetisation has been isolated, with this behaviour found to arise through a combination of a large magnetic anisotropy (D = À27.5 cmÀ1) and a pseudo-D3h symmetry at the Fe(II) centre, as investigated through ab initio and magnetic studies. In conjunction with ab initio calculations, experimental investigations of the magnetic properties of 1 have confirmed it to be the first example of a TBP Fe(II) coordination complex to display slow relaxation of the magnetisation.
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