Crystal structure of a low-spin poly[di-μ 3 -cyanido-di-μ 2 -cyanido-bis-(μ 2 -2-ethyl-pyrazine)-dicopper(I)iron(II)]

• Published in: Acta crystallographica. Section E, Crystallographic communications Crystallographic communications, 2019-08, Vol.75 (Pt 8), p.1205-1208
• Main Authors: Partsevska, Sofiia V, Naumova, Dina D, Matushko, Igor P, Kucheriv, Olesia I, Gural'skiy, Il'ya A
• Format: Article
• Language: English
• Subjects: bimetallic; copper(I); crystal structure; dicyanocuprate; ethylpyrazine; iron(II); metal–organic framework; Research Communications
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S2056989019009496

In the title metal-organic framework, [Fe(C H N ) {Cu(CN) } ] , the low-spin Fe ion lies at an inversion centre and displays an elongated octa-hedral [FeN ] coordination environment. The axial positions are occupied by two symmetry-related bridging 2-ethyl-pyrazine ligands, while the equatorial positions are occupied by four N atoms of two pairs of symmetry-related cyanide groups. The Cu centre is coordinated by three cyanide carbon atoms and one N atom of a bridging 2-ethyl-pyrazine mol-ecule, which form a tetra-hedral coordination environment. Two neighbouring Cu atoms have a short Cu⋯Cu contact [2.4662 (7) Å] and their coordination tetra-hedra are connected through a common edge between two C atoms of cyanide groups. Each Cu (CN) unit, formed by two neighbouring Cu atoms bridged by two carbons from a pair of μ-CN groups, is connected to six Fe centres two bridging 2-ethyl-pyrazine mol-ecules and four cyanide groups, resulting in the formation of a polymeric three-dimensional metal-organic coordination framework.