LIGAND BEHAVIOUR OF A BIS-PYRIDAZINECARBOXAMIDE COPPER(II) COMPLEX TOWARDS NICKEL(II) BETA-DIKETONATES - X-RAY CRYSTAL STRUCTURE OF CU(BPDPN)NI(HFACAC)(2) (H(2)BPDPN=N,N'-BIS(3'-PYRIDAZINECARBOXAMIDE)-1,3-PROPANE, HHFACAC=HEXAFLUOROACETYLACETONE), A

摘要

The X-ray structure determination is reported for the complex Cu(bpdpn)Ni(hfacac)(2) (H(2)bpdpn=N,N'-bis(3'-pyridazinecarboxamide)-1,3-propane, Hhfacac=hexafluoroacetylacetone). The complex is monoclinic, P2(1)/c, a=17.527(9), b=8.876(2), c=21.165(9) Angstrom, beta=106.71(2)degrees. The deprotonated bis-pyridazinecarboxamide complex Cu(bpdpn) acts as an N,N donor, via the l-pyridazine nitrogens, to the Ni(hfacac)(2) moiety. This produces pyridazine-bridged dinuclear species with cis-N2O4 coordination to the nickel(II) atom. In addition, amide oxygen coordination occurs from each Cu(bpdpn) entity to the copper(II) atom in an adjacent Cu(bpdpn) entity. This produces chains of linked Cu(bpdpn)Ni(hfacac)(2) units, with N4O coordination to each copper. The complex is antiferromagnetic, and its magnetic properties closely fit a CuNi model. The syntheses of related complexes with other beta-diketonates have been explored, in some cases via metal-exchange reactions. Magnetic and spectroscopic properties indicate that the complexes have structures similar to that of Cu(bpdpn)Ni(hfacac)(2). [References: 19]