title: Crystal structure of bis-(μ-N-hy-droxy-picolin-amid-ato)bis-[bis-(N-hy-droxy-picolinamide)-sodium].
abstract: The title compound, [Na2(C6H5N2O2)2(C6H6N2O2)4], is a centrosymmetric coordination dimer based on the sodium(I) salt ofN-hy-droxy-picolinamide. The mol-ecule has an {Na2O6(μ-O)2} core with two bridging carbonyl O atoms and two hydroxamate O atoms of two mono-deprotonated residues ofN-hy-droxy-picolinamide, while two neutralN-hy-droxy-picolinamide mol-ecules are coordinated in a monodentate manner to each sodium ionviathe carbonyl O atoms [the Na-O distances range from 2.3044 (2) to 2.3716 (2) Å]. The penta-coordinated sodium ion exhibits a distorted trigonal-pyramidal coordination polyhedron. In the crystal, the coordination dimers are linked into chains along thecaxisviaN-H⋯O and N-H⋯N hydrogen bonds; the chains are linked into a two-dimensional framework parallel to (100)viaweak C-H⋯O and π-π stacking inter-actions.
authors.affiliation: Department of Chemistry, National Taras Shevchenko University of Kyiv, Volodymyrska Street 64, 01601 Kiev, Ukraine.
authors.forename: Inna S
authors.initials: IS
authors.lastname: Safyanova
authors.affiliation: Department of Chemistry, National Taras Shevchenko University of Kyiv, Volodymyrska Street 64, 01601 Kiev, Ukraine.
authors.forename: Kateryna A
authors.initials: KA
authors.lastname: Ohui
authors.affiliation: SSI "Institute for Single Crystals", National Academy of Sciences of Ukraine, Nauki ave. 60, Kharkiv, 61001, Ukraine.
authors.forename: Irina V
authors.initials: IV
authors.lastname: Omelchenko
keywords: crystal structure; hydrogen bonds; hydroxamic acids; π–π stacking