Di- and tetranuclear heterometallic 3d–4f cobalt(II)–lanthanide(III) complexes derived from a hexadentate bisoxime: Syntheses, structures and magnetic properties

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Five heterometallic Co(II)–Ln(III) complexes, a discrete heterodinuclear complex [CoLLa(Py)(NO3)3(CH3OH)] (1) (Py=pyridine), a heterotetranuclear dimer [Co2L2La2(4,4′-bipy)(NO3)6(CH3OH)2] (2) (4,4′-bipy=4,4′-bipyridine) and three discrete heterodinuclear complexes [CoLLn(OAc)(NO3)2(CH3OH)] (Ln=Gd (3), Tb (4), Dy (5)), were synthesized with a hexadentate bisoxime ligand 1,2-bis(3-methoxysalicylideneaminooxy)ethane (H2L), and characterized by single crystal X-ray diffraction. The complexes 1, 3, 4 and 5 are discrete heterodinuclear structures, but the assembly of two dinuclear units [CoLLa(NO3)3(CH3OH)] and one 4,4′-bipyridine results in a discrete heterotetranuclear dimer 2. The Co(II) and La(III) atoms in the complexes 1 and 2 are penta- and decacoordinated, while the Co(II) and Ln(III) (Ln=Gd, Tb and Dy) atoms in the complexes 3, 4 and 5 are hexa- and nonacoordinated, respectively. Magnetic measurements were performed on the complexes 3, 4 and 5, where an intramolecular ferromagnetic interaction is found in the complex 3.