02237nas a2200181   4500008004100000245009800041210006900139260000800208300001400216490000700230520157300237100002601810700001501836700002201851700003101873700002401904856012701928       2018                        eng d00aCross-metathesis of biorenewable dioxalates and diols to film-forming degradable polyoxalates0 aCrossmetathesis of biorenewable dioxalates and diols to filmform  cJUL  a1584-15920 v563 aStarting from commonly available sugar derivatives, a single step protocol to access a small family of isohexide-dioxalates (2a-c) has been established. The synthetic competence of 2a-c has been demonstrated by subjecting them to condensation polymerization. Quite surprisingly, the proton NMR of poly(isomannide-co-hexane)oxalate revealed a 1:2 ratio between isomannide-dioxalate (2a) and 1,6-hexanediol (3a) in the polymer backbone. This intriguing reactivity was found to be an outcome of a cross metathesis reaction between 2a and 3a. The cross metathesis products 3a[2-(2-methoxyacetoxy)ethyl 2-(2-hydroxyethoxy)-2-(3-oxydanylidene)acetate] and 2a(3R,6R)-6-hydroxyhexahydrofuro[3,2-b]-furan-3-yl methyl oxalate were isolated in a control experiment. Based on direct and indirect evidence, and control experiments, an alternative polymerization mechanism is proposed. Polymerization conditions were optimized to obtain polyoxalates P1(2a-3a)-P9(2c-3c) with molecular weights in the range of 14,000-68,000 g/mol, and narrow polydispersities. The identity of the polyoxalates was unambiguously established using 1-2D NMR spectroscopy, MALDI-ToF-MS, and GPC measurements. The practical implication of these polymers is demonstrated by preparing transparent, mechanically robust films. The environmental footprint of the selected polyoxalates was investigated by subjecting them to solution and solid-state degradation. The polyoxalates were found to be amenable to degradation. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1584-15921 aRajput, Bhausaheb, S.1 aRam, Farsa1 aMenon, Shamal, K.1 aShanmuganathan, Kadhiravan1 aChikkali, Samir, H.  uhttps://library.ncl.res.in/content/cross-metathesis-biorenewable-dioxalates-and-diols-film-forming-degradable-polyoxalates02426nas a2200253   4500008004100000022001400041245014100055210006900196260000800265300001100273490000800284520152300292653003601815653002301851653001701874653002001891653003201911653000901943100001901952700001501971700003101986700002702017856012802044       2022                        eng d  a0921-510700aCdS cubane type clusters encapsulated by rolling of single layer reduced graphene oxide sheets for enhanced mechanical energy harvesting0 aCdS cubane type clusters encapsulated by rolling of single layer  cFEB  a1155280 v2763 aComposites with Single Layer Graphene Oxide (SLGO) sheets are extremely difficult to achieve, irrespective of the current advancements in graphene composites research. The difficulties in exfoliating the graphite oxide (GO) was associated with a strong interaction among the edge sides of the adjacent layers. This in-turn barricades the foreign intruders to interact with the basal plane, thereby restraining one to form composites with SLGO sheets. In this work, we had successfully exfoliated GO through a spacer [Cd(OAc)(2) + polyethylene glycol (PEG)] to result in nano-engineered CdS cubane-type clusters in rolled up SLGO to form graphene oxide complex compound (GOCC), resembling carbon nanotubes (CNTs). The CdS cubane-type clusters were found to interacting with the carbon skeleton of rolled reduced SLGO sheet through a Manogate' structures, which was supported by density functional theory (DFT) calculations. Our theoretical study reveals that the obtained complex compound (GOCC) is thermodynamically more favourable than its ancestor materials (CdS cubane and empty CNT). Flexible piezoelectric nanogenerators (PENGs) fabricated from GOCC and thermoplastic polyurethane (TPU) resulted in output voltage (V-oc) of 4.5 V and output current of 0.4 mu A at applied force of 13 N. The nanoengineering helps to achieve superior mechanical energy harvesting performance for GOCC compared to pristine CdS, which demonstrate the potential of nanogate structures to enhance the intrinsic properties of materials.10aGraphene oxide complex compound10aNanogate structure10aNew material10aNovel procedure10aPiezoelectric nanogenerator10aSLGO1 aKumar, Praveen1 aRam, Farsa1 aShanmuganathan, Kadhiravan1 aLuwang, Meitram, Niraj  uhttps://library.ncl.res.in/content/cds-cubane-type-clusters-encapsulated-rolling-single-layer-reduced-graphene-oxide-sheets