Acta Cryst. (2009). E65, m84-m85  [ doi:10.1107/S1600536808041895 ]

A novel zinc(II) complex with the ligand 2,2',2''-(1,4,7-triazanonane-1,4,7-triyl)triacetate (NOTA)

I. Pereira-García, A. Macías, R. Bastida and L. Valencia

Abstract: The zinc(II) complex with NOTA [2,2',2''-(1,4,7-triazanonane-1,4,7-triyl)triacetate] has previously been synthesized and studied in solution, but was not isolated. The corresponding title Zn^II complex pentasodium(I) bis{[2,2',2''-(1,4,7-triazanonane-1,4,7-triyl)triacetato]zinc(II)} tris(perchlorate) methanol solvate, Na₅[Zn(C₁₂H₁₈N₃O₆)]₂(ClO₄)₃·CH₃OH, was crystallized as a sodium perchlorate double salt in methanol solution. The asymmetric unit contains two independent [Zn(NOTA)]^- complex anion entities, five sodium cations, three perchlorate anions and a methanol solvent molecule. The two Zn^II cations exhibit a distorted trigonal-prismatic N₃O₃ coordination with a bifacial arrangement of the donor atoms. Neither the methanol solvent molecule nor the perchlorate anions appear to be coordinated to the Zn centres. The crystal structure shows a layer arrangement parallel to (001) generated by interactions between the [Zn(NOTA)]^- units, the Na⁺ cations, two ClO₄^- units and the methanole molecule, leading to an overall layer composition of [Na₅[Zn(C₁₂H₁₈N₃O₆)]₂(ClO₄)₂^.CH₃OH]⁺. The third ClO₄ anion is isolated and situated between the layers without any significant interactions.

Online 17 December 2008

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