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Elastically deformable crystals of Cd(II) coordination polymers

Crystalline solids are in general considered as brittle materials which easily crack and break upon application of even smallest amount of the mechanical stress. But, during the past few years, a newly described property of crystalline solids, mechanically induced flexibility, has been reported, and since then attracting considerable attention of the scientific community. Deformation of crystals can be categorized as plastic or elastic ; while upon applied mechanical stimuli, elastic materials undergo reversible bending, the plastic materials exhibit a permanent change in their shape (irreversible deformation). So far, mechanical flexibility has been reported for a significant number of organic molecular crystals, but mechanical properties of metal-organic crystalline solids have been much less explored and understood. As a part of our previous research on several series of 1-D coordination polymers of cadmium(II) halides, we have shown that the intermolecular interactions together with structural interlocking are crucial for imparting elastic flexibility to crystalline 1-D coordination polymers, but also that small differences in the strength and geometry of intermolecular interactions can substantially change the nature and extent of mechanical response. In order to improve our understanding on structure-function correlation in mechanically flexible crystalline coordination polymers, we have prepared needle-like crystals of Cd(II) halide polymers with 2(1H)-pyrazinone and 4(3H)- pyrimidinone. The elastic deformation was thoroughly investigated and correlated with structural features.

Crystalline coordination polymers ; cadmium(II) ; elastic response, hydrogen bonds

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