Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 20, Pages 5175-5178Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201311055
Keywords
mechanical properties; metal-organic frameworks; negative thermal expansion; structural dynamics; structure elucidation
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Funding
- Australian Research Council
- Australian Government
- Australian Institute of Nuclear Science and Engineering (AINSE)
- U.S. DOE [DE-AC02-06CH11357]
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Metal-organic framework materials (MOFs) have recently been shown in some cases to exhibit strong negative thermal expansion (NTE) behavior, while framework interpenetration has been found to reduce NTE in many materials. Using powder and single-crystal diffraction methods we investigate the thermal expansion behavior of interpenetrated Cu-3(btb)(2) (MOF-14) and find that it exhibits an anomalously large NTE effect. Temperature-dependent structural analysis shows that, contrary to other interpenetrated materials, in MOF-14 the large positive thermal expansion of weak interactions that hold the interpenetrating networks together results in a low-energy contractive distortion of the overall framework structure, demonstrating a new mechanism for NTE.
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