TY - JOUR
T1 - Tetranuclear heterometallic cycle Dy2Cu2 and the corresponding polymer showing slow relaxation of magnetization reorientation
AU - Ueki, Sohei
AU - Okazawa, Atsushi
AU - Ishida, Takayuki
AU - Nogami, Takashi
AU - Nojiri, Hiroyuki
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research (Nos. 15073101, 16550121, and 15550115) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. A part of this work was performed under the inter-university cooperative research program of the Institute for Materials Research, Tohoku University.
PY - 2007/6/15
Y1 - 2007/6/15
N2 - We prepared tetranuclear complexes [{Cu(emg)(Hemg)(ROH)}2{Dy(hfac)2(ROH)}2] (abbreviated as [Dy2Cu2]-R; R = Me, Et; H2emg = ethylmethylglyoxime) and the corresponding polymer [{Cu(dmg)(Hdmg)}2{Dy(hfac)2(CH3OH)}2]n · 2(MeOH) ([Dy2Cu2]n; H2dmg = dimethylglyoxime), which were characterized as analogs of the known [Gd2Cu2] monomer and polymer, respectively, by means of X-ray crystallographic analysis. The M-H curves clarified antiferromagnetic coupling between Dy and Cu in the [Dy2Cu2] motif, leading to the Dy magnetic moments aligned parallel ([Cu(↓)Dy(↑)Cu(↓)Dy(↑)]). Ac magnetic susceptibility measurements of [Dy2Cu2]-Me and [Dy2Cu2]n exhibited a χac′ (in-phase) decrease and a concomitant χac″ (out-of-phase) increase with an increase of frequency. Low-temperature magnetization measurements on [Dy2Cu2]n exhibited magnetic hysteresis, which is characteristic of single-chain magnets.
AB - We prepared tetranuclear complexes [{Cu(emg)(Hemg)(ROH)}2{Dy(hfac)2(ROH)}2] (abbreviated as [Dy2Cu2]-R; R = Me, Et; H2emg = ethylmethylglyoxime) and the corresponding polymer [{Cu(dmg)(Hdmg)}2{Dy(hfac)2(CH3OH)}2]n · 2(MeOH) ([Dy2Cu2]n; H2dmg = dimethylglyoxime), which were characterized as analogs of the known [Gd2Cu2] monomer and polymer, respectively, by means of X-ray crystallographic analysis. The M-H curves clarified antiferromagnetic coupling between Dy and Cu in the [Dy2Cu2] motif, leading to the Dy magnetic moments aligned parallel ([Cu(↓)Dy(↑)Cu(↓)Dy(↑)]). Ac magnetic susceptibility measurements of [Dy2Cu2]-Me and [Dy2Cu2]n exhibited a χac′ (in-phase) decrease and a concomitant χac″ (out-of-phase) increase with an increase of frequency. Low-temperature magnetization measurements on [Dy2Cu2]n exhibited magnetic hysteresis, which is characteristic of single-chain magnets.
KW - Copper
KW - Dysprosium
KW - Magnetic measurements
KW - Single-chain magnet
KW - Single-molecule magnet
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U2 - 10.1016/j.poly.2006.09.048
DO - 10.1016/j.poly.2006.09.048
M3 - Article
AN - SCOPUS:34249740269
SN - 0277-5387
VL - 26
SP - 1970
EP - 1976
JO - Polyhedron
JF - Polyhedron
IS - 9-11
ER -