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In this paper, Au nanoparticles/reduced graphene oxide (AuNPs/rGO) nanocomposites were prepared through a one-pot strategy, carried out by heating the mixture of HAu[Cl.sub.4] and graphene oxide solution at 90°C under alkaline condition. The resultant AuNPs/rGO nanocomposites were found to exhibit good catalytic performance toward [H.sub.2][O.sub.2] reduction and oxidation as well as hydrazine oxidation. The electrochemical sensing application of the nanocomposites for [H.sub.2][O.sub.2], glucose, and hydrazine was also demonstrated successfully. Keywords Au nanoparticles . Reduced graphene oxide . Electrochemical detection . [H.sub.2][O.sub.2] . Glucose . Hydrazine, Introduction Graphene, a two-dimensional aromatic sheets composed of [sp.sup.2]-bonded carbon atoms, has received enormous interest in various areas of research owing to its large specific surface area, excellent thermal and [...]

The valence shell electronic structures of methylhydrazine (C[H.sub.3]NHN[H.sub.2]), 1,1-dimethylhydrazine ([(C[H.sub.3]).sub.2]NN[H.sub.2]) and tetramethylhydrazine ([(C[H.sub.3]).sub.4][N.sub.2]) are studied. A linear relationship between the ionization energy of a specific orbital and the inverse of the size of the molecule is shown and neutral and ion heats of formation for methyl-hydrazine, 1,1-dimethylhydrazine and tetramethylhydrazine are obtained from G3 calculations.

Abstract -- Some n-type semiconductor metal oxide sensors based on W[O.sub.3] and I[n.sub.2][O.sub.3] were studied in detecting unsymmetrical dimethylhydrazine (UDMH) vapors. The sensors are highly sensitive to the presence of [...]

High-pressure Diels-Alder reactions of various alkoxy/alkyl-substituted benzylideneacetones with methyl-1,3-butadienes are described. The application to the synthesis of [[DELTA].sup.8]-trans-THC in both enantiomeric pure forms is based on the resolution of selected cycloadduct by the SAMP-hydrazone method.

A practical, chromatography-free preparation of 5-lipoxygenase inhibitor MK-0633 p-toluenesulfonate is discussed. An improved second route has featured an inexpensive diastereomeric salt resolution of vinyl hydroxyl-acid followed by a robust end-game featuring hydrazide aylation/1,3,4-oxadiazole ring closure/salt formation sequence, which has produced MK-0633 p-toluenesulfonate.

The theoretical studies on electron transfer (ET) rates of a charge localized intervalence radical cation of bis(hydrazine) are reported. The results showed that electron-transfer rates are heavily dependent on the isomer geometries.

The reactivity of hydrazones toward molecular oxygen, with regard to their structure is explained by using the kinetic measurements and quantum chemical calculations. All structural kinds of hydrazones are prone to autoxidation with marked differences in the rate of the reaction and have at least one hydrogen atom on nitrogen.

Laser flash photolysis and product studies have shown that 2-azido-1,3-diphenyl-propan-1-one derivatives have undergone photoinduced C-N bond cleavage, thus forming azido radicals and the corresponding benzyl radical derivatives. It is shown that solution and solid state irradiation of 3-azido-1,3-diphenyl-propan-1-one has resulted in the formation of azide radicals that abstract an H-atom to form hydrozoic acid and hence azides can be used as photoremovable protecting groups of hydrazoic acid.

The analysis of the X-ray structure of a ditopic hydrazide derivative has led to the discovery of a new family of molecular duplex strands from hydrazide-based oligomers with malonyl groups as linkers. Molecular mechanical calculations have disclosed double-helical structures for the longer oligomers and the results have helped in the development of polymeric helical duplexes with well-defined structures.

The equilibration kinetics of hydrazone formation and transimination is shown to be significantly accelerated by using aniline as a nucleophilic catalyst. The same equilibration will take a long time, greatly limiting its practical application in dynamic covalent chemistry (DCC), in the absence of the aniline catalyst.

The electron transfer (ET) in four symmetrically substituted naphthalene-bridged bis-hydrazine radical cations is compared within the Marcus-Hush framework. The results show that ET rates estimated for four naphthalene bridged bis-hydrazine radical cations vary significantly and show no correlation with the distance between the charge-bearing units.

Rapid reactions occur between trans-[Os(super VI)(tpy)(Cl)(sub 2)(NN(CH2)(sub 4)O)](super 2+) and a series of N- or O-bases to give the tpy-substituted Os(VI)-hydrazide complexes. The reaction occur due to the extraordinary electron withdrawing effect of Os(VI) on the tpy ligand and its ability to undergo intramolecular Os(VI) to Os(IV) electron transfer.

The interaction of hydrazine with kaoline was studied using a combination of infrared (IR) spectroscopy, inelastic neutron scattering (INS), and X-ray powder diffraction. The combined application of crystallographic methods has provided new insights into the structure and bonding of the KH intercalation complex.