We have synthesized a new urea-coordinated dinickel(II) complex with a binucleating ligand, HL, which contains dimethylaminoethyl arms and a 2-hydroxytrimethylene bridge, [Ni2L(μ-Cl)(μ-urea)(urea)2](BPh4)2 (2), between its two chelating sites. Its structure as well as that of its parent comple...

A pair of racemic (ΔΔ/ΛΛ) μ-[N,N′-bis(2-aminoethyl)-1,2-ethanediamine-N1,N1′,N2,N2′]-bis[N,N′-(bis(2-aminoethyl)-1,2-ethanediamine-N,N′,N″,N‴)]dinickel(II) compounds were prepared and structurally characterized by crystallography. The perchlorate salt (1) crystallizes in the space gro...

In the present study, a new 'turn on' fluorescent sensor, (E/Z)-enaminone containing a pyrrolo[2,3-b]quinoxaline group as the fluorophore and a N,N-bis(pyridin-2-ylmethyl)ethylenediamine group as a specific chelator capable of selective detection of Zn2+ is reported. The structure of t...

Reaction of 2-chloromethylsaccharin with substituted potassium dithiocarbamates and substituted potassium dithiocarbonates furnished (1,1-dioxido-3-oxo-1,2-benzisothiazol-2(3H)-yl)methyl N,N-disubstituted dithiocarbamates (4–15) and (1,1-dioxido-3-oxo-1,2-benzisothiazol-2(3H)-yl)methyl O-alkyld...

A new series of (triphenylphosphine)(nitrosyl)(O-alkyl-dithiocarbonate)nickel complexes were synthesized and characterized. The characterization of the complexes was done by elemental analysis and by their spectroscopic data (I.R.,1H N.M.R. and M.S.). From the spectroscopic study it is deduced t...

A series of organotin(IV) complexes have been synthesized by reacting potassium o-isobutyl carbonodithioate with di- and triorganotin halides in methanol under stirring conditions. The newly synthesized complexes have been characterized by elemental analysis, FT-IR, NMR (1H and 13C) and X-ray cr...

Synthetic methods for phosphonyl compounds are described. The methods cover 37 classes of compounds. These include species of general structure: R(R'O)P(O)H, RP(O)X2 [X = Cl, Br, F, NCO, NCS, OH, OR], RP(O)(X)F [X = OH, Cl, NCO, NCS], ArP(O)(OR)2, (RO)2P(O)C(O)R', (RO)2P(O)CH(OX)R'...

Bis(2-chloroethoxy)dichlorotitanium(IV) and bis(2,2,2-trifluoroethoxy) dichlorotitanium(IV) have been prepared. The presence of new band around 510–540 cm−1 in their i.r. spectra suggest them to be dimeric through alkoxy bridges. They form solid adducts with acetonitrile and pyridines having 1:...

The catalytic performances of various nickel phosphide catalysts (NiP) supported on ZrO2 synthesized with different P/Ni molar ratios (0.8, 2 and 3) were investigated in hydrodeoxygenation (HDO) of m-cresol at 340 °C under 4 MPa. The solid sample with the highest P/Ni ratio (NiP-3/ZrO2) present...

The present work studied the effect of two supports (SiO2 and tetragonal ZrO2) on the performance of metallic nickel and nickel phosphide catalysts for the hydrodeoxygenation (HDO) of m-cresol carried out at 340 °C under 4 MPa. All catalysts were characterized using several techniques (ICP, N2 ...

The development of accurate, reliable and low cost devices for glucose detection is one of the most important scientific and technological hotspots. In this study, we proposed a unique one-step thermal synthesis strategy to synthesize nickel (Ni) nanoparticles modified graphene (GE) sheets by us...

A series of high-performance catalysts based on nickel phosphide particles supported on SBA-15 have been synthesized by temperature-programed reduction of a nickel phosphate, previously impregnated in the mesostructured silica support. In these samples the loading of the active phase varied betw...

The adsorption kinetics, density and structural property of sodium oleate on Ca2 + activated quartz surface have been studied using the techniques of quartz crystal microbalance with dissipation (QCM-D) and atomic force microscope (AFM). The real-time measurements of frequency (Δf) and dissipat...

Nickel is sourced from sulphide and laterite ores. While 70% of the nickel resources are contained in laterites, these ores are often complex and expensive to treat using conventional methods. Therefore, upgrading the nickel content in laterite ores ahead of any recovery processes is economicall...

The phase behavior in the oleic acid/sodium oleate/normal saline (0.15 M NaCl aqueous solution) system has been determined. For this purpose visual inspection of samples between crossed polarizers, and Small Angle X-ray diffraction was used to identify the various phases and their unit cell dime...

While methyl α-d-glucopyranosides and α-d-galactopyranosides selectively form 4,6-O-benzylidenes when reacted with excess benzaldehyde in the presence of acid catalyst methyl α-d-mannopyranosides does not exhibit the same selectivity because of the cis-arrangement of the C2 and C3 hydroxyl gr...

A series of monovalent α-D-mannoside ligands terminated with aromatic methyl esters have been synthesized in excellent yields using the Cu(I) catalyzed azide-alkyne 1,3-dipolar cycloaddition (“click chemistry”). These mannosides were designed to have a unique aglycone moiety (tail) that combi...

The novel and efficient synthesis of type 2 Lewis antigens is reported in this study. The rationally designed lactosamine-3,2′-diol derivative with an orthogonal set of protecting groups is efficiently glycosylated with a benzyl protected 1-thio-l-fucoside donor in a unique regioselective manne...

A chemo-enzymatic approach combining an enzymatic regioselective hydrolysis of peracetylated N-acetyl-α-d-glucosamine (1) with a mild controlled acyl migration led to 2-acetamido-2-deoxy-1,3,6-tri-O-acetyl-α-d-glucopyranose, which was further used in a glycosylation reaction in the synthesis o...

Oligosaccharides containing type 2 lactosamine repeating units, e.g. neo-lacto-octaose and trimeric Lewisx derivatives, are constructed using neo-lactosamine azide building blocks. The azido group provides a favorable protection of the anomeric position which is stable to versatile protecting gr...