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Spin crossover-induced colossal positive and negative thermal expansion in a nanoporous coordination framework material

Controlling mechanical motions in solid state devices is highly desirable for the development of nanoscale machines. Here, Kepert and colleagues exploit an ultra-flexible coordination framework in which thermally-controlled Fe(II) spin transitions result in remarkable flexing of the crystal lattice.

Benjamin R. Mullaney
Laurence Goux-Capes
Cameron J. Kepert
ResearchOpen Access20 Oct 2017
Nature Communications

Volume: 8, P: 1-6
Extreme compressibility in LnFe(CN)₆ coordination framework materials via molecular gears and torsion springs

Highly compressible crystalline materials typically rely on the high compressibility of their chemical bonds. Now, a family of LnFe(CN)₆ frameworks (Ln = Ho, Lu or Y) has been shown to exhibit pronounced volumetric and linear compressibilities through a spring-and-gear mechanism instead, in which a torsionally flexible LnN₆ unit twists reversibly under pressure.

Samuel G. Duyker
Vanessa K. Peterson
Cameron J. Kepert
Research11 Jan 2016
Nature Chemistry

Volume: 8, P: 270-275
Continuous negative-to-positive tuning of thermal expansion achieved by controlled gas sorption in porous coordination frameworks

Achieving control over the thermomechanical properties of functional materials is desirable, yet remains highly challenging. Here, the authors demonstrate continuous negative-to-positive tuning of thermal expansion in two Prussian blue analogues, by varying the concentration of adsorbed CO₂.

Josie E. Auckett
Arnold A. Barkhordarian
Cameron J. Kepert
ResearchOpen Access19 Nov 2018
Nature Communications

Volume: 9, P: 1-5

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Spin crossover-induced colossal positive and negative thermal expansion in a nanoporous coordination framework material

Extreme compressibility in LnFe(CN)6 coordination framework materials via molecular gears and torsion springs

Continuous negative-to-positive tuning of thermal expansion achieved by controlled gas sorption in porous coordination frameworks

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Extreme compressibility in LnFe(CN)₆ coordination framework materials via molecular gears and torsion springs