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12 items found (0 items not approved), displaying 11 to 12.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published	Actions
I15-1-X-ray Pair Distribution Function (XPDF) I22-Small angle scattering & Diffraction	Liquid phase blending of metal-organic frameworks Louis Longley , Sean Collins , Chao Zhou , Glen J. Smales , Sarah E. Norman , Nick J. Brownbill , Christopher W. Ashling , Philip A. Chater , Robert Tovey , Carola-bibiane Schönlieb , Thomas F. Headen , Nicholas J. Terrill , Yuanzheng Yue , Andrew J. Smith , Frédéric Blanc , David Keen , Paul A. Midgley , Thomas Bennett Nature Communications 9 DOI: 10.1038/s41467-018-04553-6 Diamond Proposal Number(s): [171151, 18236] Open Access Show Abstract ▼ Abstract: The liquid and glass states of metal–organic frameworks (MOFs) have recently become of interest due to the potential for liquid-phase separations and ion transport, alongside the fundamental nature of the latter as a new, fourth category of melt-quenched glass. Here we show that the MOF liquid state can be blended with another MOF component, resulting in a domain structured MOF glass with a single, tailorable glass transition. Intra-domain connectivity and short range order is confirmed by nuclear magnetic resonance spectroscopy and pair distribution function measurements. The interfacial binding between MOF domains in the glass state is evidenced by electron tomography, and the relationship between domain size and Tg investigated. Nanoindentation experiments are also performed to place this new class of MOF materials into context with organic blends and inorganic alloys.	Jun 2018
E02-JEM ARM 300CF	A heterogeneous single-atom palladium catalyst surpassing homogeneous systems for Suzuki coupling Zupeng Chen , Evgeniya Vorobyeva , Sharon Mitchell , Edvin Fako , Manuel A. Ortuño , Núria López , Sean M. Collins , Paul A. Midgley , Sylvia Richard , Gianvito Vilé , Javier Pérez-ramírez Nature Nanotechnology 107 DOI: 10.1038/s41565-018-0167-2 Diamond Proposal Number(s): [16967] Show Abstract ▼ Abstract: Palladium-catalysed cross-coupling reactions, central tools in fine-chemical synthesis, predominantly employ soluble metal complexes despite recognized challenges with product purification and catalyst reusability. Attempts to tether these homogeneous catalysts on insoluble carriers have been thwarted by suboptimal stability, which leads to a progressively worsening performance due to metal leaching or clustering4. The alternative application of supported Pd nanoparticles has faced limitations because of insufficient activity under the mild conditions required to avoid thermal degradation of the substrates or products. Single-atom heterogeneous catalysts lie at the frontier. Here, we show that the Pd atoms anchored on exfoliated graphitic carbon nitride (Pd-ECN) capture the advantages of both worlds, as they comprise a solid catalyst that matches the high chemoselectivity and broad functional group tolerance of state-of-the-art homogeneous catalysts for Suzuki couplings, and also demonstrate a robust stability in flow. The adaptive coordination environment within the macroheterocycles of ECN facilitates each catalytic step. The findings illustrate the exciting opportunities presented by nanostructuring single atoms in solid hosts for catalytic processes that remain difficult to heterogenize.	Jun 2018

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