TY - JOUR
T1 - An S-Shaped [Fe4Dy2] Complex Exhibiting Slow Relaxation of Magnetization
T2 - Synthesis, Magnetism, and Crystal Structures of a Family of [Fe(4)Ln(2)][Ln] Coordination Compounds (Ln = Nd, Gd, Tb, Dy, and Ho)
AU - Nayak, Sanjit
AU - Roubeau, Olivier
AU - Teat, Simon J.
AU - Beavers, Christine M.
AU - Gamez, Patrick
AU - Reedijk, Jan
PY - 2010/1/4
Y1 - 2010/1/4
N2 - A series of heterobimetallic 3d−4f cluster coordinationcompounds has been synthesized using a Schiff-base ligand (H3L), atrinuclear iron(III) precursor complex and lanthanide nitrates as reactants.Five new isostructural complexes were prepared with the ligand in 4 differentforms, i.e., neutral and 3 different levels of deprotonation, and with thegeneral formula [FeIII4LnIII2(H2L)2(HL)2L2(CH3OH)2((CH3)3CCOO)2(NO3)2][LnIII(NO3)4(H3L)(CH3OH)]·NO3·H2O,where Ln is Nd, Gd, Tb, Dy, and Ho for compounds 1, 2, 3, 4,and 5, respectively. The single-crystal structures of two complexeswere determined by X-ray diffraction, consisting of an original [FeIII4LnIII2]2+ moietywith a linear S-shaped [Ln-Fe4-Ln] core and an isolated LnIII ioncoordinated by nitrate anions and the neutral Schiff-base ligand. Theisostructural nature of all five coordination compounds is further illustratedboth by XRPD and IR analysis. Magnetic properties of all five compounds havebeen studied and are discussed in light of magnetostructural considerations.Among these five compounds, the Dy (4) cluster shows frequency-dependentac-susceptibility indicative of probable single-molecule magnet behavior.
AB - A series of heterobimetallic 3d−4f cluster coordinationcompounds has been synthesized using a Schiff-base ligand (H3L), atrinuclear iron(III) precursor complex and lanthanide nitrates as reactants.Five new isostructural complexes were prepared with the ligand in 4 differentforms, i.e., neutral and 3 different levels of deprotonation, and with thegeneral formula [FeIII4LnIII2(H2L)2(HL)2L2(CH3OH)2((CH3)3CCOO)2(NO3)2][LnIII(NO3)4(H3L)(CH3OH)]·NO3·H2O,where Ln is Nd, Gd, Tb, Dy, and Ho for compounds 1, 2, 3, 4,and 5, respectively. The single-crystal structures of two complexeswere determined by X-ray diffraction, consisting of an original [FeIII4LnIII2]2+ moietywith a linear S-shaped [Ln-Fe4-Ln] core and an isolated LnIII ioncoordinated by nitrate anions and the neutral Schiff-base ligand. Theisostructural nature of all five coordination compounds is further illustratedboth by XRPD and IR analysis. Magnetic properties of all five compounds havebeen studied and are discussed in light of magnetostructural considerations.Among these five compounds, the Dy (4) cluster shows frequency-dependentac-susceptibility indicative of probable single-molecule magnet behavior.
U2 - 10.1021/ic901781a
DO - 10.1021/ic901781a
M3 - Article (Academic Journal)
SN - 0020-1669
VL - 49
SP - 216
EP - 221
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 1
ER -