Wydział Chemii

Beata Cristóvão

Barbara Miroslaw

Julia Kłak

2012

Polyhedron

34

121-128

10.1016/j.poly.2011.12.013

Naukowa

Angielski

Artykuł

Synthesis, crystal structures and magnetic studies of new heterotri- and heterodinuclear complexes having general formulae [Cu₂Ln(L)₂(NO₃)(H₂O)₂](NO₃)₂·3H₂O (where Ln = Ce (1), Pr (2), Nd (3) and La (4)), and [CuLn(L)(NO₃)₂(H₂O)₃MeOH]NO₃·MeOH (where Ln = Dy (5) and Er (6)), respectively involving the Schiff base (H₂L) as main ligand are reported. The heterotrinuclear complexes crystallize in the monoclinic space group C2/c with the molecule lying on the twofold axis (Z′ = 0.5), while the dinuclear complexes (5 and 6) form monoclinic crystals with space group P2₁/n. The lanthanide(III) cation in Cu^II–Ln^III–Cu^II core is 10-coordinated, whereas in dinuclear compounds the coordination number for Ln(III) ion is only nine. The polyhedra formed around terminal Cu(II) ions in 1–3 have a shape of deformed tetragonal pyramid with water molecule in apical position. In crystals 5 and 6 the Cu(II) has octahedral coordination. The temperature dependence of the magnetic susceptibility and the field-dependent magnetization indicated that the interaction between Cu^II and Ln^III ions is antiferromagnetic for Ln = Ce, Pr and Nd and ferromagnetic for Ln = Dy and Er.

Heterotrinucelar complexes, Heterodinucelar complexes, Schiff-base, crystal structure, magnetic properties

http://dx.doi.org/10.1016/j.poly.2011.12.013

http://www.elsevier.com