Crystal structure of poly[N,N-diethyl-2-hy­droxy­ethan-1-aminium [μ(3)-cyanido-κ(3) C:C:N-di-μ-cyanido-κ(4) C:N-dicuprate(I)]]

In the title compound, {(C(6)H(16)NO)[Cu(2)(CN)(3)]}(n), the cyanide groups link the Cu(I) atoms into an open three-dimensional anionic network, with the mol­ecular formula Cu(2)(CN)(3) (−). One Cu(I) atom is tetra­hedrally bound to four CN groups, and the other Cu(I) atom is bonded to three CN groups in an approximate trigonal-planar coordination. The tetra­hedrally coordinated Cu(I) atoms are linked into centrosymmetric dimers by the C atoms of two end-on bridging CN groups which bring the Cu(I) atoms into close contact at 2.5171 (7) Å. Two of the cyanide groups bonded to the Cu(I) atoms with trigonal-planar surrounding link the dimeric units into columns along the a axis, and the third links the columns together to form the network. The N,N-di­ethyl­ethano­lamine mol­ecules used in the synthesis have become protonated at the N atoms and are situated in cavities in the network, providing charge neutrality, with no covalent inter­actions between the cations and the anionic network.