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artículo con referato
"Three zinc(II) complexes presenting a ZnN6 chromophore and with peroxodisulfate as the counter-ion"
M. Harvey, S. Baggio, A. Ibañez and R. Baggio
Acta Cryst. C 60(8) (2004) m375-m381
The crystal structures of three Zn complexes with the peroxodisulfate anion (pds2-) acting as counter-ion are reported, namely bis(2,2′:6′,2″-terpyridine-κ3N)zinc(II) hexaoxo-μ-peroxo-disulfate(VI) dihydrate N,N-dimethylformamide solvate, [Zn(C15H11N3)2](S2O8)·2H2O·C3H7NO or [Zn(tpy)2](pds)·2H2O·DMF, (I), bis[2,4,6-tris(2-pyridyl)-1,3,5-triazine-κ2N2,N4]zinc(II) hexaoxo-μ-peroxo-disulfate(VI) dihydrate, [Zn(C18H12N6)2](S2O8)·2H2O or [Zn(tpt)2](pds)·2H2O, (II), and bis[2,6-bis(1H-benzimidazol-2-yl-κN3)pyridine]zinc(II) hexaoxo-μ-peroxo-disulfate(VI) N,N-dimethylformamide trisolvate, [Zn(C19H13N5)2](S2O8)·3C3H7NO or [Zn(bbp)2](pds)·3DMF, (III), where tpy is 2,2′:6′,2″-terpyridine, tpt is 2,4,6-tris(2-pyridyl)-1,3,5-triazine, bbp is 2,6-bis(1H-benzimidazol-2-yl)pyridine and DMF is N,N-dimethylformamide. The three structures are monomeric and present the Zn cation in a distorted octahedral environment, defined by two chelating tricoordinated ligands at almost right angles to each other. These cationic entities interact with an anionic network composed of hydrogen-bonded pds2- anions and solvate water and DMF molecules via Coulombic forces, and with each other through a number of ππ and C=Cπ contacts connecting the aromatic rings. The pds2- anions stabilize the structures in unprecedented counter-ion behaviour.
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