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Synthesis, Structure, and Magnetism of Heterobinuclear Complex GdCu(OTf)_{3}(bdmap)_{2}(H_{2}O)·THF

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Gao S., Borgmeier O., Lueken H.

Acta Physica Polonica A

1996

vol. 90

issue 2

393-398

A new heterobinuclear Gd(III)-Cu(II) complex [GdCu] = GdCu(OTf)_{3}(bdmap)_{2}(H_{2}O). THF (OTf=SO_{3}CF_{3}) has been prepared by reaction of 1,3-bis(dimethylamino)-2-propanol (bdmapH) with Cu(OCH_{3})_{2} and lanthanide triflate salt Gd(OTf)_{3} in a 2:1:1 ratio in THF. Its structure has been determined by single-crystal X-ray diffraction. [GdCu] crystallizes on an orthorhombic lattice, space group P2_{1}2_{1}2_{1} with Z=4 and a=11.023(3) Å, b=17.555(15) Å, c=20.212(7) Å, V=3911(4) Å^{3}. For 2194 independent reflections with I > 1σ(I), full-matrix least squares refinement with anisotropic thermal parameters for Gd, Cu, S, and O converged to unweighted and weighted R factors of 0.074 and 0.085, respectively. Gd is coordinated by six O and two N. Cu is coordinated by two O and two N. Gd and Cu are bridged by two alkoxo O atoms with separation of 3.311(4) Å. The magnetic susceptibilities were measured over the temperature range 1.7-20 K at the field range 0.01-0.5 T. The data of [GdCu] at 0.05 T have been analyzed with the use of a Heisenberg spin Hamiltonian Ĥ=-2JŜ_{Gd}·Ŝ_{Cu} giving g=2.046(2), J=-0.039(3) cm^{-1}. This shows that Gd-Cu spins are coupled very weakly in the antiferromagnetic manner, though the distance between Gd(III) and Cu(II) ions is rather short.

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1 Acta Physica Polonica A

1 1996

1 Borgmeier O.

1 Gao S.

1 Lueken H.

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Synthesis, Structure, and Magnetism of Heterobinuclear Complex GdCu(OTf)_{3}(bdmap)_{2}(H_{2}O)·THF