The dissociation kinetics of lanthanide-N-methylethylenediamine-N,N′,N′-triacetate (MEDTA) complexes have been studied in aqueous acetic acid/ sodium acetate solutions using Cu2+ ions as sequestring agent. The reaction mechanism involves a fast protonation equilibrium (KH) of a mixed complex L...

A fully automated potentiometric procedure is presented for the determination of free ligand concentrations of ternary systems in aqueous solutions. A primary model selection and an estimation of the stability constants of the ternary system can be obtained from the same data. The automated tech...

Formation constants of protonated and chelate species formed between hydrogen ion and rare-earth cations and the anion of the recently synthesized N′-methylethylenediamine-N,N,N′-triacetic acid were determined at an ionic strength of 0.100 M (KNO3) and 25° by a potentiometric method.

N′-Methylethylenediamine-N,N,N′-triacetic acid has been synthesized for the first time by a classical carboxymethylation procedure (yield 71%) using cation-exchange elution techniques to isolate the amino acid product from a complex reaction mixture, prior to crystallizing from an alcohol-wate...

New dinuclear and polynuclear Ag(I) complexes with the formula of [Ag2(sac)2(pen)2] (1) and [Ag2(sac)2(nmen)]n (2), (sac = saccharinate, pen = 1,3-diaminopropane, nmen = N-methylethylenediamine) have been synthesized and characterized by IR spectroscopy and thermal (TG/DTG, DTA) analysis. In add...

An ebulliometer was used to measure total vapor-pressure (PTx) data on nine mixtures of water+N-methylethylenediamine (and the pure components) between 52 and 116°C. Bubble-point data were measured at six pressures from 13.33 to 101.325 kPa. These PTx data indicate the following azeotropic beha...

Polymeric tetracyanonickelate(II) complexes of the type [M(L)2Ni(CN)4]n (LN-methylethylenediamine (men) or N-ethylethylenediamine (neen); MNi(II), Cu(II), Zn(II) or Cd(II)) have been prepared and characterized by FT-IR, Raman spectroscopy, thermal and elemental analysis techniques. Additionally,...

We report the formation of adsorbed t-butoxy by addition of transient t-butyl radicals to surface oxygen, in the reactions of t-butyl iodide and t-butanethiol on Rh(111)-p(2 × 1)O. t-Butanethiol reacts by cleavage of the weak SH bond, forming adsorbed t-butyl thiolate upon adsorption at 100...

AFM and XPS data for model Pd supported catalysts show that the morphology of these catalysts is greatly affected by reduction in hydrogen and by addition of sulfur compounds to the surface before reaction. It was found that reduction of the catalyst before thiophene addition decreases the S/Pd ...

The surface-enhanced Raman scattering (SERS) of 1-butanethiol was investigated in a silver sol. The molecule was found to be chemisorbed dissociatively on the silver surface by rupture of its SH bond. It is concluded that conformers of 1-butanethiol adsorbed selectively on the silver surface, ...

The catalytic behavior of platinum nanoparticles modified by iron (III) ions and 1-butanethiol was evaluated by determining the selectivity of hydrogenation of trans,trans-2,4-hexadienal, where the hydrogenation products were monitored by UV–vis spectroscopy and gas chromatograph. For the pure ...

In the present study the kinetics of liquid phase oxidation of light thiols using novel cobalt phthalocyanine sulphonamide catalyst developed indigenously was investigated in a semi batch reactor. 1-Butanethiol was chosen to represent thiols in lighter range of petroleum fractions like liquefied...

Threshold photoelectron-photoion coincidence (TPEPICO) spectroscopy was employed to study the unimolecular chemistry of metastable ionized 1- and 2-butanethiol. The ions were both found to form two products, m/z 56 (C4H+·8) and m/z 60 (C2H4S+·) corresponding to the losses of H2S and C2H6 respe...

Isothermal vapor–liquid equilibrium (VLE) of the following systems was measured with a recirculation still: 1-butanethiol + methylcyclopentane at 343.15 K, 1-butanethiol + 2,2,4-trimethylpentane at 368.15 K, 3-methylthiophene + toluene at 383.15 K, 3-methylthiophene + o-xylene at 383.15 K, and ...

A facile preparation of (±)-3-hydroxy-3-phenylpropanenitrile has been carried out by ring-opening of styrene oxide with NaCN in aqueous ethanol. Subsequent kinetic resolution of this material via lipase-mediated transesterification gave the S-alcohol and R-acetate in excellent yields and high e...

This paper reports the values of the standard (p∘ = 0.1 MPa) molar enthalpy of formation in the gas phase, at T = 298.15 K, for 3-hydroxypropanenitrile derived from the respective enthalpy of combustion in oxygen, measured by static bomb combustion calorimetry and the standard molar enthalpy of...

Organic-inorganic hybrid materials of the type MeQ(diamine)1/2 (where Me–Zn, Cd, Mn and Q–S, Se, Te) belong to the class of 3D nanomaterials. They are built of layers of II–VI semiconductors and amines, which act as linkers. The main goal of our work was the synthesis of compounds of the type...

Greenhouse gas emissions have increased dramatically over the past years and had a significant impact on global warming. This study investigates the modification of multi-walled carbon nanotubes (MWCNTs) with diamine precursor to improve the carbon dioxide adsorption capacity. To achieve this go...

Molecular structures are proposed for the two conformers, s-cis and gauche, existing for 3-butenenitrile and 3-methyl-3-butenenitrile, and for the three predicted conformers of 2-methyl-3-butenenitrile, using structural parameters transferred from related molecules. The proposed structures for t...

Gas—liquid critical pressure and critical temperature were determined experimentally throughout the composition range for the seven binary systems comprising the n-alkanes from n-pentane through n-undecane with n-butanenitrile as a common component. Some of these mixtures are known to form a po...