Ferromagnetic and Plastically Deformable Organic-Inorganic Hybrid Crystal: (C₇H₉NH₃)₂CuCl₄

S. Kusumoto, S. Nagasawa, R. Suzuki, M. Tachibana, Y. Tsuji, H. Zenno, Y. Nakashima, S. Hayami, Y. Kim, Y. Koide

We report a plastically deformable organic–inorganic hybrid crystal, (C7H9NH3)2CuCl4, exhibiting ferromagnetism below 8 K. Its 2D layered structure enables stress-induced plastic bending via van der Waals slip between alkyl chains. Nanoindentation reveals exceptional mechanical compliance, and magnetic studies confirm long-range ordering. This represents the first known example of a ferromagnetic crystal with plastic deformability.

Chem. Commun., 61, 10303-10306 (2025). (DOI: 10.1039/D5CC02170G)