Electrochemical Behaviour and Electronic Absorption of the Metal β- Diketonates Complexes
Issue:
Volume 2, Issue 1, February 2013
Pages:
1-7
Published:
20 February 2013
Abstract: The electrochemical properties of -diketonate complexes, such as [Co(tta)2(H2O)2], [Ni(tta)2(H2O)2], [Cu(tta)2] and [Zn(tta)2(H2O)2] (tta = deprotonated of 1-thenoyl-4,4,4-trifluoroacetone) have been studied using cyclic voltammetry (CV). Their redox behaviors including oxidation and/ or reduction process for both central atom and tta ligand have been discussed. The cyclic voltammogrammes display one irreversible oxidation peak in a positive potential region, where it appears in the area between + 1.30 and + 1.95 V based on the type of complex. In addition, two reduction peaks are appeared in the negative region potentials, at the region between – 1.06 to – 2.16 V. The irreversible oxidation potential peak of thienyl ring has shifted to the lower positive potential, while the reversibly redox potential peak of the fluorinated--diketone moiety shifts to the higher negative potential compared with non-coordinated H-tta ligand. The spectral properties, energy levels, and energy gap for the respective complexes have been verified with UV-Vis spectrophotometer.
Abstract: The electrochemical properties of -diketonate complexes, such as [Co(tta)2(H2O)2], [Ni(tta)2(H2O)2], [Cu(tta)2] and [Zn(tta)2(H2O)2] (tta = deprotonated of 1-thenoyl-4,4,4-trifluoroacetone) have been studied using cyclic voltammetry (CV). Their redox behaviors including oxidation and/ or reduction process for both central atom and tta ligand have...
Show More
Thermochemistry of Heteroatomic Compounds: Analysis and Calculation of Thermody-namic Functions of Amino Acids and Some Peptides of Different Space Structure
Vitaly Vitalevich Ovchinnikov
Issue:
Volume 2, Issue 1, February 2013
Pages:
8-15
Published:
20 February 2013
Abstract: The values of free energies, the heats of combustion and formation in condensed and gaseous phases over 30 amino acids of different structure were analyzed. Entropies and heat capacities in standard conditions were considered too. Twenty one equations of such type as Yо = i ± f (N – g) +Σ(hc)j, in which Yо is thermodynamic function or heat capaci-ty, i and f are stoichiometric coefficiens, Σ(hc)j are the sums of the number (j) of the heat corrections for the mentioned thermodynamic magnitudes, N is the number of valence electrons, from which a number of lone electron pairs (g) is ex-cepted for. The obtained equations were used for the calculations of a new such parameters for four phosphorylated amino acids, two enkephalines and two human peptides of low molecular weights.
Abstract: The values of free energies, the heats of combustion and formation in condensed and gaseous phases over 30 amino acids of different structure were analyzed. Entropies and heat capacities in standard conditions were considered too. Twenty one equations of such type as Yо = i ± f (N – g) +Σ(hc)j, in which Yо is thermodynamic function or heat capaci...
Show More
Green Surfactants From the Type of Fatty Acids As Effective Corrosion Inhibitors for Mild Steel in CO2- Saturated NaCl Solution
Hany M. Abd El-Lateef,
I. T. Ismayilov,
V. M. Abbasov,
E. N. Efremenko,
L. I. Aliyeva,
E. E. Qasimov
Issue:
Volume 2, Issue 1, February 2013
Pages:
16-23
Published:
20 February 2013
Abstract: Four sulfated fatty acid diethanolamine complexes (DC) were synthesized based on four different types of vegetables oils and tested as corrosion inhibitors of mild steel in CO2-saturated 1% NaCl solution at 50 °C. Results ob-tained show that the surfactants studied are efficient corrosion inhibitors for mild steel even at low concentrations. It is found that the inhibition efficiency increases with the concentration, and the good inhibition efficiencies are reached near their critical micelle concentrations (99.95% at 100 ppm). The adsorption of inhibitor on the steel surface obeys the Lang-muir adsorption isotherm equation and was chemisorption. Energy dispersive X-ray fluorescence microscopy (EDRF) ob-servations of the electrode surface confirmed the existence of such an adsorbed film.
Abstract: Four sulfated fatty acid diethanolamine complexes (DC) were synthesized based on four different types of vegetables oils and tested as corrosion inhibitors of mild steel in CO2-saturated 1% NaCl solution at 50 °C. Results ob-tained show that the surfactants studied are efficient corrosion inhibitors for mild steel even at low concentrations. It is ...
Show More
