Journal
CRYSTENGCOMM
Volume 17, Issue 2, Pages 361-369Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ce01572j
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Funding
- EPSRC [EP/G004528/2]
- ERC [279705]
- EPSRC [EP/G004528/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G004528/2] Funding Source: researchfish
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The metal-organic framework copper(i) tricyanomethanide, Cu(tcm), undergoes a ferroelastic transition on cooling below T-f = 240 K. Thermal expansion measurements reveal an order-of-magnitude variation in framework flexibility across T-f. The low-temperature phase alpha-Cu(tcm) exhibits colossal positive and negative thermal expansion that is the strongest ever reported for a framework material. On exposure to acetonitrile, Cu(tcm) undergoes a reconstructive solid-phase transition to acetonitrilocopper(i) tricyanomethanide. This transition can be reversed by heating under vacuum. Infrared spectroscopy measurements are sensitive to the phase change, suggesting that Cu(tcm) may find application in solid-phase acetonitrile sensing.
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