Magnetically isolated (CuGdIII)-Gd-II pairs in the series [Cu(acacen)Gd(pta)(3)], [Cu(acacen)Gd(hfa)(3)], [Cu(salen)Gd(pta)(3)], and [Cu(salen)Gd(hfa)(3)]

Ryazanov, M.; Nikiforov, V.; Lloret, F.; Julve, M.; Kuzmina, N.; Gleizes, A.

Авторы: Ryazanov M., Nikiforov V., Lloret F., Julve M., Kuzmina N., Gleizes A.
Журнал: Inorganic Chemistry
Том: 41
Номер: 7
Год издания: 2002
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 1816
Последняя страница: 1823
DOI: 10.1021/ic0110777
Аннотация: [Cu(salen)Gd(pta)3] (1), [Cu(acacen)Gd(pta)3] (2), and [Cu(acacen)Gd(hfa)3] (3) are three heterobimetallic [CuIIGdIII] complexes of general formula [Cu(SB)Gd(β-dik)3], in which a N,N‘,O,O‘ Schiff base (SB) ligand [acacen = N,N‘-ethylenebis(acetylacetoniminate(−)), salen = N,N‘-ethylenebis(salicylideneiminate(−))] tetracoordinates CuII and chelates GdIII as a tris(β-diketonate) complex [hfa = 1,1,1,5,5,5-hexafluoropentane-2,4-dionate(−); pta = 1,1,1-trifluoro-5,5-dimethylhexane-2,4-dionate(−)]. They crystallize as a triclinic structure (space group P1̄). The cell parameters are a = 9.8616(10) Å, b = 12.1976(13) Å, c = 18.4187(22) Å, α = 90.671(14)°, β = 100.588(13)°, γ = 103.684(12)°, V = 2113 Å3, and Z = 2 for 1; a = 9.7560(11) Å, b = 12.2924(13) Å, c = 18.9368(22) Å, α = 88.449(14)°, β = 87.269(14)°, γ = 67.629(12)°, V = 2098 Å3, and Z = 2 for 2; and a = 12.5726(15) Å, b = 15.5985(18) Å, c = 18.3724(21) Å, α = 85.963(13)°, β = 85.411(14)°, γ = 80.766(14)°, V = 3539 Å3, and Z = 4 for 3. The Cu(O,O‘)Gd bridging cores show folding angles about O,O‘ in the range 139°−147° and intramolecular Cu···Gd distances of about 3.3 Å. In the solid state, the molecules form centrosymmetric pseudodimers [Cu(SB)Gd(β-dik)3]2, through the overlap of the Cu(SB) entities. Resulting intradimer Cu···Cu distances are 5.941(1) Å for 1, 4.831(1) Å for 2, and 4.511(1) and 3.868(1) Å for 3 which comprises two symmetrically independent dimers. The temperature dependence of complexes 1−3 was investigated in the range 1.8−300 K and revealed weak ferromagnetic interactions. Results are discussed in light of the structural features and of available magnetostructural data for other heterobimetallic [CuIIGdIII] complexes, including [Cu(salen)Gd(hfa)3] (4) (Ramade, I.; Kahn, O.; Jeannin, Y.; Robert, F. Inorg. Chem. 1997, 36, 930−936).
Добавил в систему: Никифоров Владимир Николаевич

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Magnetically isolated (CuGdIII)-Gd-II pairs in the series [Cu(acacen)Gd(pta)(3)], [Cu(acacen)Gd(hfa)(3)], [Cu(salen)Gd(pta)(3)], and [Cu(salen)Gd(hfa)(3)]статья

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