Browsing by Author "Luks, E"

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    Interpenetration as a mechanism for negative thermal expansion in the metal–organic framework Cu3(btb)2 (MOF-14)
    (Wiley, 2014-04-01) Wu, Y; Peterson, VK; Luks, E; Darwish, TA; Kepert, CJ
    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 Cu3(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. © 2014, WILEY‐VCH Verlag GmbH & Co. KGaA.
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    Synthesis of deuterated [D-32]oleic acid and its phospholipid derivative [D-64]dioleoyl-sn-glycero-3-phosphocholine
    (Wiley-Blackwell, 2013-07-16) Darwish, TA; Luks, E; Moraes, G; Yepuri, NR; Holden, PJ; James, M
    Oleic acid and its phospholipid derivatives are fundamental to the structure and function of cellular membranes. As a result, there has been increasing interest in the availability of their deuterated forms for many nuclear magnetic resonance, infrared, mass spectroscopy and neutron scattering studies. Here, we present for the first time a straightforward, large-scale (gram quantities) synthesis of highly deuterated [D32]oleic acid by using multiple, yet simple and high yielding reactions. The precursors for the synthesis of [D32]oleic acid are [D14]azelaic acid and [D17]nonanoic acid, which were obtained by complete deuteration (>98% D) of their 1H forms by using metal catalysed hydrothermal H/D exchange reactions. The oleic acid was produced with ca. 94% D isotopic purity and with no contamination by the trans-isomer (elaidic acid). The subsequent synthesis of [D64]dioleoyl-sn-glycero-3-phosphocholine from [D32]oleic acid is also described. Copyright © 2013 John Wiley & Sons, Ltd.© 2013, Wiley-Blackwell.