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Fine-tuning of mechanical flexibility of cadmium(II) halide crystals via ligand replacement

Molecular crystals are excellent candidates for designing a wide range of functional materials due to their arranged internal structure. However, the brittleness and stiffness of the crystals have so far proved to be a limiting factor in their practical implementation. In recent years, there has been an increasing number of molecular crystals that show a flexible response when mechanical force is applied to them, [1, 2] but also it has been shown that the degree of mechanical response can be controlled by introducing small structural changes. [3, 4] In order to clarify the influence of different structural parameters on mechanical flexibility, we present a new family of coordination cadmium(II) polymers with 2, 6-diiodopyrazine, which also show a flexible response to external mechanical force. The molecular and crystal structure were determined and the structural characteristics of the prepared compounds were correlated with the extent of mechanical response. [1] C. M Reddy, G. R Krishna, S. Ghosh, CrystEngComm 12 (2010) 2296. [2] A. Worthy, A. Grosjean, M. C. Pfrunder, Y. Xu, C. Yan, G. Edwards, J. K. Clegg, J. C. McMurtrie, Nat. Chem. 10 (2018) 65. [3] M. Đaković, M. Borovina, M. Pisačić, C.B. Aakeröy, Ž.Soldin, B.-M. Kukovec, I. Kodrin, Angew. Chem. Int. Ed. 57 (2018) 14801. [4] M. Pisačić, I. Biljan, I. Kodrin, N. Popov, Ž. Soldin, M. Đaković, Chem.Mater. 33 (2021) 3660.

coordination polymers, cadmium(II), mechanical response, elastic

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