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Mechanical behaviour of crystals of copper(II) coordination polymers

The rapid development of advanced technologies is continuously requiring materials with improved properties, among which flexibility and adaptability are playing a central role. Crystalline materials, due to their brittleness, have for long not been considered as candidates for application in new technologies, despite all the advantages resulting from the long-range order. [1] But, the recently discovered flexibility of organic [2] and metal-organic [3] molecular crystals has drastically changed our perception of crystalline materials and their potential application. So far, a substantial number of organic and metal-containing crystals with flexible responses have been reported, but our understanding of structural features required for engendering crystalline materials with desired mechanical responsiveness is still far from being complete. In order to get an insight into the flexible responsiveness of crystals as well as structural features required to equip the crystals with flexible responses, we prepared a series of crystalline coordination polymers of copper(II) halides with pyridine derivatives, namely, [CuBr2(3-Cl-py)]n (1), [CuBr2(3-Br-py)]n (2) and [CuBr2(3-I-py)]n (3). Crystals of 1 and 2 displayed typical plasticity (Figure 1) while 3 showed recently described elastic->plastic flexible response. [4] In-depth structural analysis together with the correlation of structural features with the observed mechanical responses pointed at intermolecular interactions as the key structural requirement that guided a particular mechanical response.

crystals, copper(II) coordination polymers, elasticity, plasticity, elastic->plastic flexible response

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