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Guest-dependent negative thermal expansion in a lanthanide-based metal–organic framework

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Abstract

A lanthanide-based metal–organic framework (MOF) named SION-2 displays strong and tuneable uniaxial negative thermal expansion (NTE). The coefficient of thermal expansion α1 reaches −153(6) MK−1 between 100 and 340 K, which is the highest value reported to date for Ln-based MOFs. After heating to 380 K and subsequent cooling, the directionality and the magnitude of the effect change dramatically: the strong NTE effect is no longer observed along X1, while a much weaker NTE effect emerges in a perpendicular direction. Loss of non-coordinated N,N-dimethylformamide molecules together with the reduction of the size of structural voids stands as a rationale behind this switch-over.

Graphical abstract: Guest-dependent negative thermal expansion in a lanthanide-based metal–organic framework

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Publication details

The article was received on 17 Jun 2019, accepted on 23 Jul 2019 and first published on 23 Jul 2019


Article type: Paper
DOI: 10.1039/C9CE00941H
CrystEngComm, 2019, Advance Article

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    Guest-dependent negative thermal expansion in a lanthanide-based metal–organic framework

    A. Gładysiak, S. M. Moosavi, L. Sarkisov, B. Smit and K. C. Stylianou, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE00941H

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