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Complexes with diimine ligands. Part III. Synthesis, structure and magnetic studies of mixed acetylacetonatecobalt(II) derivatives

1991; Elsevier BV; Volume: 181; Issue: 1 Linguagem: Inglês

10.1016/s0020-1693(00)85259-7

1873-3255

Albert Escuer, Ramón Vicente, Teresa Comas, Joan Ribas, Montserrat Gómez, Xavier Soláns, Dante Gatteschi, Claudia Zanchini,

Synthesis and Biological Evaluation

The synthesis and properties of the mononuclear [Co(L)(hfacac)2], [Co(L)(tfacac)2] and of the dinuclear complexes [Co2(L)(acac)4], where L is 2,3-bis(2−pyridyl)pyrazine (DPP), 2,3-bis(2−pyridyl)quinoxaline (DPQ), 6-methyl-2,3-bis(2−pyridyl)quinoxaline (MeDPQ), 6,7-dimethyl-2,3-bis(2−pyridyl)quinoxaline (DMeDPQ), 6-chloro-2,3-bis(2−pyridyl)quinoxaline (ClDPQ), 2,3-bis(2−pyridyl)benzoquinoxaline (BDPQ); hfacac, tfacac and acac being hexafluoroacetylacetonate, trifluoroacetylacetonate and acetylacetonate, respectively, are described. The structures of [Co(L)(hfacac)2] where L=BDPQ and DMeDPQ were solved. The [Co(BDPQ)(hfacac)2] complex crystallizes in the Pi space group with cell parameters a=14.382(4), b=12.853(3), c=9.094(3) Å, α=92.55(3), β=100.80(3), γ=94.54(3)° and Z=2. The [Co(DMeDPQ)(hfacac)2] complex crystallizses in the P21/a space group with cell parameters a=19.130(5), b=9.248(3), c=18.198(4) Å,β=95.18(3) and Z=4. Magnetic properties of the dinuclear complexes and a study of the coordination possibilities of this kind of ligands are presented.