Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 10, Pages 4454-4456Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja204908m
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Funding
- EPSRC (UK) [EP/G004528/2]
- STFC (WISH diffractometer)
- ANR [ANR-09-BLAN-0018-01]
- Engineering and Physical Sciences Research Council [EP/G004528/2] Funding Source: researchfish
- EPSRC [EP/G004528/2] Funding Source: UKRI
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We show that lain [Ag(CN)(2)](3) exhibits the strongest negative linear compressibility (NLC) effect over the largest pressure range yet observed. Variable pressure neutron powder diffraction measurements reveal that its crystal lattice expands along the c axis of its trigonal cell under increasing hydrostatic pressure, while contracting along the a axis. This corresponds to a wine-rack-like mechanism for NLC that we find also results in anisotropic negative thermal expansion (NTE) in the same material. Inclusion of extra-framework K+ counterions has minimal effect on framework flexibility (and hence the magnitude of NTE/NLC) but selectively frustrates the soft phonon modes responsible for destroying NLC in the related material Ag-3[Co(CN)(6)].
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