Vol 4, No 19 (2016)

The degree of substitution for methyl and hydroxyethyl substituents in hydroxyethyl methyl cellulose (GEMTS) was determined by solid-state 13C NMR spectroscopy. GEMTS six commercial samples of differing viscosity aqueous solutions were studied. The data on the degree of substitution were obtained by integrating various spectral ranges in 13C NMR spectrum considering the intensities of signals of different types of carbon atoms. The proposed method of measuring the degree of substitution is convenient and rapid. The experimental results agree well with the data on the degree of substitution stated by the manufacturer of the GEMTS samples studied.

The effect of some inorganic and organic cations on the value of the potential and the electrochemical characteristics of the iodide selective electrode was investigated. The possible causes of distortion of the electrode function in the presence of Fe3+, Cu2+, papaverine, thiamine, drotaverine, diphenylhydramine are discussed.

Currently the derivatives of imidazole and acridine are widely studied because of their high selectivity and efficiency for the quantitative determination of elements in complexes. The study considers the application of new organic reagents for fluorimetric determination of silver and zink traces in various substances.

Direct template macrobicyclization of three aliphatic, aromatic and dichlorinecontaining a-dioxime molecules with 4-pyridinylboronic acid on a Fe2+ ion as a matrix afforded the first macrobicyclic tris-dioximates with 4-pyridinyl apical substituents. Pyridinyl-functionilized iron (II) clathrochelates emerge as first homogeneous electrocatalysts of hydrogen evolution at low pH; varying their ribbed substituents allows designing electrocatalysts with better performance and stability in harsh near-industrial conditions.

The mechanism of the electrocatalytic reaction of hydrogen generation from water in the presence of acridinium salts was studied. The key intermediates of the reaction have been identified.