TY - JOUR
T1 - Magnetic properties and exchange couplings of one-dimensionally arrayed 4f-3d heterometallic [Ln2Cu2]n compounds
AU - Okazawa, Atsushi
AU - Watanabe, Ryo
AU - Nojiri, Hiroyuki
AU - Nogami, Takashi
AU - Ishida, Takayuki
N1 - Funding Information:
This work was partly supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan (Nos. 17550166, 18654058, and 19550135), the CASIO Science Promotion Foundation, and the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University. A part of this work was performed at CINTS, Tohoku University.
PY - 2009/6/22
Y1 - 2009/6/22
N2 - Heterometallic polymeric coordination compounds [{Ln(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n ([Ln2Cu2]n; Ln = Tb, Ho, and Er; H2dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous to those of the known ferrimagnetic [Gd2Cu2]n and [Dy2Cu2]n analogs. The exchange couplings in [Tb2Cu2]n, [Ho2Cu2]n, and [Er2Cu2]n were precisely evaluated by high-frequency EPR and pulsed-field magnetization studies, giving JTb-Cu/kB = -0.77(2) K, JHo-Cu/kB = -0.250(12) K and JEr-Cu/kB = -0.149(15) K. They were comparable to those of the Gd and Dy analogs. The absolute value of the exchange coupling parameter monotonically decreases in the order of Gd, Tb, Dy, Ho, and Er.
AB - Heterometallic polymeric coordination compounds [{Ln(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n ([Ln2Cu2]n; Ln = Tb, Ho, and Er; H2dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous to those of the known ferrimagnetic [Gd2Cu2]n and [Dy2Cu2]n analogs. The exchange couplings in [Tb2Cu2]n, [Ho2Cu2]n, and [Er2Cu2]n were precisely evaluated by high-frequency EPR and pulsed-field magnetization studies, giving JTb-Cu/kB = -0.77(2) K, JHo-Cu/kB = -0.250(12) K and JEr-Cu/kB = -0.149(15) K. They were comparable to those of the Gd and Dy analogs. The absolute value of the exchange coupling parameter monotonically decreases in the order of Gd, Tb, Dy, Ho, and Er.
KW - EPR
KW - Exchange interaction
KW - Lanthanide
KW - Rare earth metal
KW - Single-molecule magnet
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U2 - 10.1016/j.poly.2008.12.035
DO - 10.1016/j.poly.2008.12.035
M3 - Article
AN - SCOPUS:67349171824
SN - 0277-5387
VL - 28
SP - 1808
EP - 1813
JO - Polyhedron
JF - Polyhedron
IS - 9-10
ER -