Poly[di-ethyl-ammonium [tetra-μ2-cyanido-κ8 C:N-tricuprate(I)]], a two-dimensional network solid.

The title compound, (C4H12N)[Cu3(CN)4] n , crystallizes as a CuCN network solid, with di-ethyl-ammonium cations sandwiched between planar CuCN sheets comprised of trigonal planar and digonally coordinated CuI atoms bridged by linear CN groups to form 24-membered rings. The digonally coordinated CuI atoms and the di-ethyl-ammonium cations lie on separate crystallographic twofold rotation axes. One of the two independent CN groups has a 50:50 disordered orientation, while the other has one orientation favored due to a N-H⋯NC hydrogen bond between the di-ethyl-ammonium cation and the anionic CuCN framework. These hydrogen bonds link the sheets together into a three-dimensional network.