engleski

Electrical Properties of Flexible Coordination Compounds of Copper(II) Halides with 3-nitropiridine

The physical properties of crystalline substances depend not only on their molecular structure, but also on the arrangement of molecules in the solid state. Consequently, supramolecular interactions are recognized as one of the important parameters for tuning the physical properties of crystalline solids. Precisely for this reason, crystal engineering is experiencing its upswing because it provides insights into the understanding and control of intermolecular interactions with the aim for preparing crystalline substances with the desired supramolecular outcome and desired physical properties. However, the brittleness and stiffness of the crystals have so far proved to be a limiting factor in their practical implementation. On other hand, the recent discovery of molecular crystals adaptable to external mechanical stimuli results in a significant shift towards considering these materials as potential candidates for application in advanced technologies. 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. Coordination polymers have proven as ideal models of metal-organic systems that result in flexible crystals. In order to improve our understanding on structure–function correlation in mechanically flexible crystalline coordination polymers, we have prepared needle-like crystals of coordination polymers of copper(II) halides with 3-nitropyridine. An external mechanical force was applied to the obtained needle-like crystals, whereby the type of mechanical response was determined and, at a later step, also quantified. The mechanical response of the crystal is correlated with the strength and directionality of the intermolecular interactions present in the crystal packings. In addition, electrical properties were studied using impedance spectroscopy, as the first step in a potential application of these flexible crystalline materials.

copper(II) ; coordination polymers ; elastic response ; electrical properties ; 3-nitropyridine

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