Acta Cryst. (2008). E64, m566-m567  [ doi:10.1107/S1600536808006995 ]

Diaqua(nitrato-²O,O')bis(L-phenylalaninato-²O,O')lead(II) nitrate

S. Bernès and L. Gasque

Abstract: In the title complex, [Pb(C₉H₁₁NO₂)₂(NO₃)(H₂O)₂]NO₃, the cation is a monomeric species including zwitterionic aminoacids. In both zwitterions, rotation of the NH₃⁺ groups about their C-N bonds is blocked by intermolecular N-HO hydrogen bonds. Assuming a limit for Pb-O bond lengths of 3 Å, the Pb^II ion is coordinated by eight O atoms. Each phenylalaninate ligand coordinates asymmetrically, with one short and one long Pb-O bond. Coordinated water molecules are also found at significantly different distances, while the bidentate nitrate ion coordinates symmetrically. The resulting [Pb^IIO₈] core is hemi-directed, with a void placed almost trans to a carboxylate group. However, the 6s² lone pair of the metal center can not be considered as stereochemically active, as a non-coordinating O atom of a nitrate belonging to a symmetry-related cation is placed in the empty hemisphere, with a short PbO separation of 3.035 (10) Å.

Online 20 March 2008

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