The syntheses, X-ray crystal structures and magnetic properties of [Mn 12O12(O2CCF2Cl)16(H 2O)4] (1) and [PPh4][Mn12O 12(O2CCF2Cl)16(H2O) 4] (2) are reported. Complex 1·4H2O crystallizes in the tetragonal space group I4̄ at 150(1) K with a = 18.6838(1) Å, c = 13.3829(5) Å, and Z = 2. Reduction of complex 1 with PPh4I in CH2Cl2 leads to isolation of complex 2·2H 2O·CH2Cl2, it crystallizes in the monoclinic space group P21/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 χMT 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.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry