Kinetic studies of conversion of B4H10 to B5H11 are reported. The rate equation Rate = 6·5 × 1013 exp (−24300RT)(B4H10) is interpreted in terms of the two step reaction B4H10 → B4H8 + H2B4H8 + B2H6 → B5H11 + BH3 wherein the first step is rate limiting.Application of semitopological equations...

The reaction of nido-B5H9 with MeHSi(NMe2)2 yields a new silyl substituted tetraborane(8) derivative (Me2N)2BH2MeSiB4H8 (1). The silyl substituent is part of a new four membered ring system SiR2(NR′2)2BH2+ · The reaction product has been characterized by X-ray crystallography, multinuclear and...

The molecular structure of 2,4-(t-butylethano)tetraborane(10), 2,4-(ButCHCH2)B4H8, in the gas phase has been determined by analysis of electron diffraction data, restrained by MP26–31G∗ ab initio calculations. The effect of the t-butyl group is mainly to twist the C-C bond of the C2B4 ‘basket’...

The UV spectra of gaseous B4H10 and B5H9 are measured down to about 187 nm and are compared to the already known spectrum of B2H6. All the spectra are completely continuous, which suggests repulsive excited states. With respect to B2H6 absorption, that of B4H10 appears shifted to the blue, while...

Diborane–tetraborane conversion in a C60 cage is theoretically considered by using AM1-RHF type semiempirical quantum chemical approach. Molecular orbital characteristics of some endohedrally boron hydride doped C60 composite systems are investigated and the likeliness of diborane–tetraborane ...

Fully optimized geometries are reported for two possible isomers of B4H10. At the restricted Hartree-Fock level, the unobserved bisdiborane isomer is lower in energy than the observed isomer. Generalized-molecular-orbital, configuration-interaction calculations show that electron correlation is ...

The kinetic study of the thermal decomposition of tetraborane-10 in the presence of carbon monoxide revealed that the reaction was approximately first order in tetraborane-10 and zero order in carbon monoxide. The heat of activation of the reaction was found to be 24,560 cal per mole. The close ...

A size-exclusion high performance liquid chromatographic-inductively coupled atomic emission spectrometric (SE-HPLC-ICP-AES) method was developed in order to elucidate the role of citric acid in the complexation of nickel in xylem saps of cucumber plants. The complexation of nickel by citric aci...

CoPMo/Al2O3 catalysts were prepared using H3PMo12O40 and Co complexes with citric acid (CA) or non-complexing organic additives such as ethylene glycol (EG), diethylene glycol, triethylene glycol (TEG), glycerol, and a mixture of EG and CA. The catalysts were characterized by low-temperature N2 ...

The objective of the present study was to investigate the indirect bioleaching of low-grade nickel limonite and saprolite ores using fungal metabolic organic acids generated by Aspergillus niger. The indirect bioleaching experiments were carried out in a 2000 ml five-neck glass vessel containing...

The sol-gel method is applied to prepare nano-sized LMNCO lithium-rich layered oxides by adding of composite organic acid (citric acid & tartaric acid). The effect of composite organic acid on the microstructure of Li1.2Mn0.54Ni0.13Co0.13O2 (LMNCO) Li-rich cathode material is explored in this wo...

Electroplating of Ni on an AZ91D Mg alloy in alkaline citrate baths was studied. It was found that NiSO4 and citric acid form a soluble complex. Ni plating with a smooth surface was obtained from the bath containing 0.55 mol dm−3 of nickel sulfate, 0.28–0.55 mol dm−3 of citric acid, and 0.88 mo...

Citric acid hold great promise to improve the Mo-based catalyst performance for hydrogenation reaction applications. MoO3/CeO2-Al2O3 catalysts were prepared by impregnation method with adding citric acid into CeO2-Al2O3 composite supports and tested for sulfur resistant methanation. The syngas m...

An acidic electroless nickel bath was formulated to plate high phosphorus nickel alloy at a low temperature from 45 to 50 °C. The low temperature EN bath, containing nickel ions, reducing agent, complexing agent, stabilizer, and accelerator, was optimized in composition to deposit high phosphor...

The dissolution of nickel and cobalt from Caldag lateritic nickel ore using the combination of sulphuric and ascorbic acids was investigated. The use of other organic acids, namely citric, maleic and stearic acids, as synergistic reagents was studied for comparison. The results revealed that the...

Aldose reductase (EC 1.1.1.21) is believed to be involved in the pathogenesis of diabetic complications. Inhibitors of this enzyme could be useful for the treatment of diabetic cataracts and neuropathies. A series of spiro[chroman-4,5′-thiazolidine]-2′,4′-diones, substituted at the aromatic r...

IntroductionP-glycoprotein (P-gp) is an energy-dependent transporter that contributes to the efflux of a wide range of xenobiotics at the blood–brain barrier playing a role in drug-resistance or therapy failure. In this study, we evaluated [123I]-4-(2-(bis(4-fluorophenyl)methoxy)ethyl)-1-(4-iod...

The difference in the site of electrophilic nitration of meso-tetra-thien-2-yl- and thien-3-yl-porphyrins is explained based on the difference in extended conjugation between porphyrin core and meso-thienyl rings. The significance of resonance in dictating the site of substitution is also explai...

Quasi-noble-metal graphene quantum dots (GQDs) deposited stannic oxide (SnO2) with oxygen vacancies (VOs) were prepared by simply sintering SnO2 and citric acid (CA) together. The redox process between SnO2 and GQDs shows the formation of oxygen vacancy states below the conduction band of stanni...

Stannic oxide (SnO2) nanoparticles have been suspended in polyvinyl alcohol (PVA) matrix in different PVA:SnO2 molar ratios ranging from 1:1 to 1:5 using simple chemical route. This suspension was deposited on ceramic substrate and upon drying was carefully detached from the substrate. SnO2-embe...