A crystalline metal-organic complex undergoes a polymorphic transformation upon cooling below 215 K. Depending on the cooling rate, crystals exhibit different behaviours that include breaking and "jumping". Variable temperature X-ray diffraction (XRD) and optical microscopy have been employed to analyze the anisotropic changes of the crystallographic axes and propose a mechanism by which the crystals acquire the momentum for the jump.
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Lusi et al. (2013) studied this question.
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