Abstract The basis of this research includes the preparation aromatic azoimine complexes resulting from coupling reaction (4) Schiff bases with diazotized dinitroaniline reagent. Ultraviolet spectra, infrared and melting points are among most important physical methods used to identification right compounds prepared in study. After that, stoichiometric ratios components complex were determined ...

Abstract For a period of several years the philosopher science Hasok Chang has promoted various inter-related views including pluralism, pragmatism, and an associated view natural kinds. He also argued for what he calls persistence everyday terms in scientific view. claims that like phlogiston were never truly abandoned but became transformed into different concepts remain useful. On other hand...

In this research complexation of dioxovanadium(V) with nitrilotriacetic acid (NTA) at differentionic strengths (0.1 to 1.0 mol dm-3) of sodium perchlorate as supporting electrolyte and pH rangeof 1.00-2.50 at 25 °C has been investigated by a combination of potentiometric and UVspectrophotometric measurements. Stability constants of two species, V0211L- and VO2H2L havebeen calculated. Ionic stre...

the complexation of sodium molybdate with para-sulfonatocalix [4] arene was studied in thetemperature range from 20 to 40 °c and ph = 5.8 by spectroscopic method in water solution. thestability constants of complexes were calculated by the multiwavelength analysis of spectral datausing squad program. the equilibrium constant, spectroscopic data, molar absorptivities andconcentrations of all spe...

A comparative research has been developed for acidity and stability constants of M(Glu), M(Asp) and M(Ttr) complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) complexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(As...

A comparative research has been developed for acidity and stability constants of M(TTA) and M(Asp) complexes which have been determined by potentiometric pH titration. Depending on metal ion–binding properties, vital differences in building complex were observed. The present study shows that in M(TTA) complexes, metal ions are coordinated to the carboxyl groups, but in M(Asp) some metal ions ar...

We have computed the free energy profiles of the deprotonation reactions of lumiflavin in the semiquinone and fully reduced oxidation states using constrained DFT-based molecular dynamics simulations. In the semiquinone state, the N5 nitrogen atom and the N1 nitrogen atom can become protonated. We find, in agreement with experiment, that the N5 site is the predominant proton acceptor in the sem...