Notizen:Die Kristallstruktur von polymerem Bis (dimethyl- glyoximato) -pyrazin - eisen(II)a/Crystal Structure of Polymerie Bis(dimethylglyoximato)pyrazine Iron (II)a

Abstract

Abstract Bis(dimethylglyoximato)pyrazine-iron(II), (dmgH)2Fepyz, crystallizes isotypicly with the Co(II) compound (dmgH)2Copyz in the space group C2/m, the lattice constants being a = 1407, b = 680.0, c = 919 pm, β=125.6°, Z = 2. The structure was determined using the powder pattern. It shows planar (dmgH)2Fe moieties which are polymerized via axially bonded, bridging pyrazine ligands to form a linear chain of symmetry 2/m. The distance Fe-N = 200 pm in the chain is considerably shorter than in (dmgH)2Copyz (Co-N = 224 pm), since the latter has one extra electron in an antibonding orbital.