Ask the locals: Dynamic deformation of the dicopper tetracarboxylate paddlewheel unit within a metal–organic framework from square-prismatic (see picture, left) to distorted (right) occurs at very low energies. This deformation, which contributes strongly to the negative thermal expansion of this system, is a local vibration induced by a redistribution of electron density at the CuO junctions.
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Peterson et al. (2009) studied this question.
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