Flat layers are usually considered as structurally rigid motifs in two-dimensional (2D) materials. In this work, we demonstrate that a flat honeycomb-layer composed of distorted tri-coordinate copper ions bridged with cyanidos in (tetraethylammonium)Cu2(CN)3 exhibits high in-plane flexibility. This resulted in an extremely large anisotropic 2D-thermal expansion.
Y. Iwai, M. Nakaya, Y. Tsuji, B. Le Ouay, M. Ohba and R. Ohtani, Chem. Commun., 2024, 60, 6512 DOI: 10.1039/D4CC01232A
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