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Single-molecule magnets: [Mn12O12(O2CCF2Cl)16(H2O)4]0/−

Authors
Journal
Polyhedron
0277-5387
Publisher
Elsevier
Publication Date
Volume
24
Identifiers
DOI: 10.1016/j.poly.2005.03.106
Keywords
  • Crystal Structure
  • Single-Molecule Magnet
  • Step-Like Hysteresis Loop
  • Magnetic Quantum Tunneling
Disciplines
  • Physics

Abstract

Abstract The syntheses, X-ray crystal structures and magnetic properties of [Mn 12O 12(O 2CCF 2Cl) 16(H 2O) 4] ( 1) and [PPh 4][Mn 12O 12(O 2CCF 2Cl) 16(H 2O) 4] ( 2) are reported. Complex 1 · 4H 2O crystallizes in the tetragonal space group I 4 ¯ at 150(1) K with a = 18.6838(1) Å, c = 13.3829(5) Å, and Z = 2. Reduction of complex 1 with PPh 4I in CH 2Cl 2 leads to isolation of complex 2 · 2H 2O · CH 2Cl 2, it crystallizes in the monoclinic space group P2 1/ c at 150(1) K with a = 18.6623(7) Å, b = 13.3626(5) Å, c = 45.4482(17) Å, β = 97.204°, and Z = 4. The results of DC and AC magnetic susceptibility studies are described. DC studies of complexes 1 and 2 in a 1.0 kG field show maxima of the χ M T versus T plot in the 5–10 K range at 47.63 and 54.27 emu K mol −1, respectively. Complexes 1 and 2 exhibit out-of-phase component of the AC magnetic susceptibility with frequency dependent maxima. Step-like features are seen on hysteresis loops of complex 1. DC decay relaxation of complex 1 shows quantum tunneling behavior below 2.1 K.

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