Crystal structure of catena -poly[[[(2-eth-oxy-pyrazine-κ N )copper(I)]-di-μ 2 -cyanido] [copper(I)-μ 2 -cyanido]].

In the asymmetric unit of the title coordination compound, {[Cu(CN)(C ₄ H ₃ OC ₂ H ₅ N ₂ )][Cu(CN)]} _n , there are two Cu atoms with different coordination environments. One Cu ^I ion is coordinated in a triangular coordination geometry by the N atom of the 2-eth-oxy-pyrazine mol-ecule and by two bridging cyanide ligands, equally disordered over two sites exchanging C and N atoms, thus forming polymeric chains parallel to the c axis. The other Cu atom is connected to two bridging cyanide groups disordered over two sites with an occupancy of 0.5 for each C and N atom, and forming an almost linear polymeric chain parallel to the b axis. In the crystal, the two types of chain, which are orthogonal to each other, are connected by cuprophilic Cu⋯Cu inter-actions [2.7958 (13) Å], forming two-dimensional metal-organic coordination layers parallel to the bc plane. The coordination framework is further stabilized by weak long-range (electrostatic type) C-H⋯π inter-actions between cyano groups and 2-eth-oxy-pyrazine rings.
(© Partsevska et al. 2019.)