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

Peter W R Corfield,Thomas James Stavola

doi:10.1107/s2414314620009682

Abstract

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.

Highlights

The title compound, (C4H12N)[Cu3(CN)4]n, crystallizes as a CuCN network solid, with diethylammonium 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 diethylammonium cations lie on separate crystallographic twofold rotation axes
There has been continuing interest in the synthesis and structures of CuCN network solids containing protonated nitrogen bases, with at least 40 such structures listed in the CSD (Groom et al, 2016)

Summary

Structure description

There has been continuing interest in the synthesis and structures of CuCN network solids containing protonated nitrogen bases, with at least 40 such structures listed in the CSD (Groom et al, 2016). A recent paper reports optical memory effects for two tetramethylammonium CuCN structures (Nicholas et al, 2019) while Grifasi et al (2016) is one of several papers reporting on the interesting topologies and photoluminescence of many CuCN networks. Of the two independent Cu atoms, Cu1 is linearly coordinated to two CN groups and lies on the crystallographic twofold rotation axis [0, y, 0], while trigonally coordinated Cu2 is in a general position, Fig. 1. Each of the two independent CN groups bridges two copper(I) atoms to build a two-dimensional CuCN network perpendicular to the a axis. Four such sheets cross the unit cell, as shown in the packing diagram, Fig. 2.

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Synthesis and crystallization

Absolute structure parameter

Data collection

Special details