TY - JOUR
T1 - Single-molecule magnets
T2 - [Mn12O12(O 2CCF2Cl)16(H2O)4] 0/-
AU - Tsai, Hui Lien
AU - Shiao, Hong Ann
AU - Jwo, Tyn Yih
AU - Yang, Chen I.
AU - Wur, Ching Shuei
AU - Lee, Gene Hsiang
N1 - Funding Information:
We thank the National Science Council of the Republic of China (NSC-92-2113-M-006-011) for support.
PY - 2005/11/17
Y1 - 2005/11/17
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/27644521999
UR - https://www.scopus.com/pages/publications/27644521999#tab=citedBy
U2 - 10.1016/j.poly.2005.03.106
DO - 10.1016/j.poly.2005.03.106
M3 - Article
AN - SCOPUS:27644521999
SN - 0277-5387
VL - 24
SP - 2205
EP - 2214
JO - Polyhedron
JF - Polyhedron
IS - 16-17
ER -