Crystal structure of bis(μ-N-hydroxypicolinamidato)bis[bis(N-hydroxypicolinamide)sodium]

Abstract

The title compound, [Na2(C6H5N2O2)2(C6H6N2O2)4], is a centrosymmetric coordination dimer based on the sodium(I) salt of N-hydroxypicolinamide. The molecule has an {Na2O6(μ-O)2} core with two bridging carbonyl O atoms and two hydroxamate O atoms of two mono-deprotonated residues of N-hydroxypicolinamide, while two neutral N-hydroxypicolinamide molecules are coordinated in a monodentate manner to each sodium ion via the carbonyl O atoms [the Na - O distances range from 2.3044 (2) to 2.3716 (2) Å]. The pentacoordinated sodium ion exhibits a distorted trigonal-pyramidal coordination polyhedron. In the crystal, the coordination dimers are linked into chains along the c axis via N - H⋯O and N - H⋯N hydrogen bonds; the chains are linked into a two-dimensional framework parallel to (100) via weak C - H⋯O and π-π stacking interactions.