Coordination of Schiff bases derived from pyrrole-2-carboxaldehyde and triamines to copper(II) and nickel(II) ions. Crystal structures of [Cu(C15H20N5)]NO3 and [Ni(C15H20N5)]ClO4 |
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Authors: | Edmund Kwiatkowski Marek Kwiatkowski Aleksandra Olechnowicz Giuliano Bandoli |
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Institution: | (1) Department of Chemistry, University of Gda sk, ul. Sobieskiego 18, 80952 Gda sk, Poland;(2) Department of Pharmaceutical Sciences, University of Padua, via F. Marzolo 5, 35131 Padua, Italy |
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Abstract: | The Schiffbases 1,9-bis(2-pyrrolyl)-2,5,8-triazanona-1,8-diene (H2L1), 1,10-bis(2-pyrrolyl)-2,5,9-triazaundeca-l,9-diene (H2L2), and 1,11-bis(2-pyrrolyl)-6-methyl-2,6,10-triazaundeca-l,10-diene (H2L4) react with copper(II) nitrate or nickel(II) perchlorate in the presence of triethylamine to give new complexes Cu(HL1,2,4)]NO3 and Ni(HL1,2,4)]ClO4. The crystal structures of Cu(HL2)]NO3 and Ni(HL2)]CIO4 have been determined from single crystal diffractometer data and refined to finalR factors of 5.09 and 5.3%, respectively. Crystallographic data: Cu(HL2)]NO3: monoclinic,P21/c,a=10.036(2),b=14.500(2),c=13.317(2) Å, =108.14(1)°,Z=4, andd
c
=11.427 Mg m–3; Ni(HL2)]ClO4: monoclinic,P21/n,a=10.578(3),b=13.953(3),c=12.394(4) Å, =93.78(2)°,Z=4, andd
c
=1.549 Mg m–3. In both the structures the potentially pentadentate ligand (HL2)– acts as a tetradentate one leaving one pyrrole group uncoordinated. Interesting is the metal dependent sequence of the three chelate rings. While the Ni (II) ion coordinates the (HL2)– ligand to form a 5-5-6-membered ring system, the ring arrangement in the copper complex is of the 5-6-5 type. |
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