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Reversible pressure pre-amorphization of a piezochromic metal–organic framework

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Abstract

The piezochromic metal–organic framework Co2(Bdc)2Dabco·4DMF·H2O (Bdc denotes 1,4-benzenedicarboxylate, Dabco – 1,4-diazabicyclo[2.2.2]octane, and DMF – dimethylformamide) under ambient conditions is tetragonal (phase α) and at about 1.9 GPa undergoes a strong pressure-induced shortening of translational correlations in the sample. A broad gradual pre-amorphization process starting at about 0.7 GPa reduces the tetragonal symmetry and is described as phase β. The pre-amorphization mechanism involves several competing distortions of the Bdc linkers and Co(II)-coordination schemes. These in turn, affect the crystal field around the cations and their optical absorption. The compression strongly affects the VIS absorption of this piezochromic compound visibly changing its colour from blue to red.

Graphical abstract: Reversible pressure pre-amorphization of a piezochromic metal–organic framework

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Publication details

The article was received on 11 Jul 2017, accepted on 27 Sep 2017 and first published on 28 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02511D
Citation: Dalton Trans., 2017, Advance Article
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    Reversible pressure pre-amorphization of a piezochromic metal–organic framework

    M. Andrzejewski, N. Casati and A. Katrusiak, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02511D

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