Application of a Novel Magnetic Balance in the Determination of Magnetic Susceptibility of Complex Compounds

In this paper the synthesis and the study of some complex compounds of Fe(III) with ligands derived from: 2-(4-chloro-phenylsulfanyl)-1-(2-hydroxy-3,5-diiodo-phenyl)-ethanone (HL1), 1-(3,5-dibromo-2-hydroxy-phenyl)-2-phenylsulfanyl-ethanone(HL2), and 2-(4-chloro-phenylsulfanyl)-1-(3,5-dibromo-2-hydroxy-phenyl)-ethanone (HL3) is presented. The characterization of these complexes is based on method as: the elemental chemical analysis, IR and ESR spectroscopy, M�ssbauer, the thermogravimetric analysis and X-ray diffraction. Study of the IR and chemical analysis has evidenced that the precipitates form are a complexes and the combination ratio of M:L is 1:2. The central atoms of Fe(III) presented paramagnetic properties and a octaedric hybridization. Starting from this precipitation reactions, a method for the gravimetric determination of Fe(III) with this organic ligands has been possible. Based on the experimental data on literature indications, the structural formulae of the complex compounds are assigned.

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USING MALIC ACID SOLUTIONS FOR THE HYDRATION OF VEGETABLE OILS AND LECITHIN PRODUCTION

Известия вузов. Пищевая технология ◽

10.26297/0579-3009.2020.1.9 ◽

2020 ◽

Author(s):

Л.А. МАРЧЕНКО ◽

Т.Н. БОКОВИКОВА ◽

Е.В. ЛИСОВАЯ ◽

С.А. ИЛЬИНОВА ◽

Е.П. ВИКТОРОВА

Keyword(s):

Malic Acid ◽

Complex Compounds ◽

Point Of View ◽

Magnesium Ions ◽

Ph Values ◽

Calcium And Magnesium ◽

The Stability ◽

The Cost ◽

Calcium And Magnesium Ions

Исследована возможность применения яблочной кислоты (ЯК) в качестве гидратирующего агента для перевода негидратируемых форм фосфолипидов в гидратируемые. Выбор ЯК обусловлен ее стоимостью, которая в 1,5 раза меньше стоимости янтарной кислоты, широко применяемой в качестве гидратирующего агента, а также большей доступностью с точки зрения промышленного производства. Исследование процесса комплексообразования и определение состава комплексных соединений ЯК с ионами кальция и магния осуществляли методом потенциометрического титрования. Установлено, что внесение в раствор ЯК ионов кальция и магния приводит к снижению значений рН, что свидетельствует о наличии комплексообразования в указанных системах. Наиболее устойчивыми являются комплексы ионов кальция и магния с непротонированным лигандом при соотношении Ме2 : лиганд 1 : 1. В процессе комплексообразования ионы Ca2 и Mg2 вытесняют протоны только карбоксильных групп ЯК, которая с ионами кальция образует более устойчивые комплексы, чем с ионами магния. Показано, что устойчивость комплексов ЯК с ионами кальция и магния значительно выше, чем устойчивость комплексов фосфатидилсеринов и фосфатидных кислот с указанными ионами. Использование водных растворов ЯК в качестве гидратирующего агента позволит повысить эффективность процесса гидратации и увеличить выход фосфолипидов и, следовательно, готового продукта лецитина. The possibility of using malic acid (MA) as a hydrating agent for converting non-hydrated forms of phospholipids into hydrated ones has been investigated. The choice of MA is due to its cost, which is 1,5 times less than the cost of succinic acid, as well as greater availability from the point of view of industrial production. The study of the complexation process and determination of the composition of complex compounds of MA with calcium and magnesium ions was carried out by the method of potentiometric titration. It was found that the introduction of calcium and magnesium ions into the MA solution leads to a decrease in pH values, which indicates the presence of complexation in these systems. Complexes of calcium and magnesium ions with an unprotected ligand at a ratio of ME2 : ligand 1 : 1 are the most stable. In the process of complexing, Ca2 and Mg2 ions displace protons only of the carboxyl groups of MA, which forms more stable complexes with calcium ions than with magnesium ions. It is shown that the stability of MA complexes with calcium and magnesium ions is significantly higher than the stability of phosphatidylserine and phosphatidic acid complexes with these ions. Using water solutions of MA as a hydrating agent will increase the efficiency of the hydration process and increase the yield of phospholipids and, consequently, the finished product lecithin.

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Determination of Rock Cleavages Using AMS (Anisotropy of Magnetic Susceptibility): a Case Study on the Geochang Granite Stone, Korea

The Journal of the Petrological Society of Korea ◽

10.7854/jpsk.2015.24.3.209 ◽

2015 ◽

Vol 24 (3) ◽

pp. 209-231 ◽

Cited By ~ 2

Author(s):

Hyeongseong Cho ◽

Jong-Sun Kim ◽

Kun-Ki Kim ◽

Moo-Hwan Kang ◽

Young Kwan Sohn ◽

...

Keyword(s):

Magnetic Susceptibility ◽

Anisotropy Of Magnetic Susceptibility

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Structure of the linear trinuclear complex hexakis(acetato)bis(2,2'-bipyridine)trimanganese (II). Determination of the J electron-exchange parameter through magnetic susceptibility and high-field magnetization measurements

Inorganic Chemistry ◽

10.1021/ic00012a020 ◽

1991 ◽

Vol 30 (12) ◽

pp. 2666-2671 ◽

Cited By ~ 121

Author(s):

S. Menage ◽

S. E. Vitols ◽

P. Bergerat ◽

E. Codjovi ◽

O. Kahn ◽

...

Keyword(s):

Magnetic Susceptibility ◽

High Field ◽

Exchange Parameter ◽

Electron Exchange ◽

Trinuclear Complex ◽

Magnetization Measurements ◽

Field Magnetization ◽

High Field Magnetization

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Arrays of solid contact potentiometric sensors for separate determination of some cephalosporin antibiotics

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2021-87-5-5-13 ◽

2021 ◽

Vol 87 (5) ◽

pp. 5-13

Author(s):

E. G. Kulapina ◽

A. E. Dubasova ◽

O. I. Kulapina ◽

V. D. Ankina

Keyword(s):

Response Time ◽

Reference Model ◽

Complex Compounds ◽

Potentiometric Sensors ◽

Separate Determination ◽

Solid Contact ◽

Active Components ◽

Membrane Surfaces ◽

Cephalosporin Antibiotics

Arrays of potentiometric sensors including developed solid-contact unmodified and modified sensors based on tetradecylammonium associates with complex compounds of silver (1) and some β-lactam antibiotics (cefazoline, cefuroxime, cefotaxime (n = 3 – 6)) are proposed; polyaniline and copper oxide being modifiers. The main electroanalytic properties of the sensors are determined (the range of the determined concentrations in antibiotic solutions 1 × 10–4 – 0.1 M, 46.3 < S < 48, Cmin = n × 10–5 М, response time 4 – 10 sec, potential drift 4 – 6 mV/day, service life — 2 months). It is shown that modification of the membrane surfaces brings the steepness of the electrode functions to Nernst-values for single-charged ions of the antibiotics under study; reduces the response time and the detection limits, the linearity intervals of the electrode functions being the same. The potentiometric selectivity coefficients of unmodified and modified sensors based on different electrode active components (EAC) to the studied cephalosporins in the presence of interfering antibiotics are close to unity; cross sensitivity parameters for the considered sensors (the average slope of the electrode function of the sensor Sav, the unselectivity factor F, and the reproducibility factor K) are 46.3 < S (mV/pC) < 48; 0.85 < F < 0.90; 144 < K < 170, respectively. Application of sensors in the multisensory analysis of model mixtures of cephalosporin antibiotics is shown. Method of artificial neural networks (ANN) is used for processing of analytical signals. The correctness of the determination is carried out using «spike tests» on the reference model mixtures (the relative error of the determination does not exceed 12 %).

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