Complex formation of polyene antibiotics with polyvinylpyrrolidone by the method of differential IR spectroscopy

1976 ◽  
Vol 10 (9) ◽  
pp. 1233-1237 ◽  
Author(s):  
V. A. Vainshtein ◽  
E. D. �tingov
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Polyene Antibiotics

Study of intermolecular interactions and complex formation of aminofurazans by IR spectroscopy

1994 ◽  
Vol 43 (12) ◽  
pp. 2122-2125 ◽  
Author(s):  
N. O. Cherskaya ◽  
O. V. Kharitonova ◽  
V. A. Shlyapochnikov ◽  
T. S. Novikova ◽  
L. I. Khmel'nitskii
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Intermolecular Interactions

scholarly journals Sorption of Richlokain on Polycarboxylic Acid Gels

2016 ◽  
Vol 5 (4) ◽  
pp. 311
Author(s):  
Marat K. Beysebekov ◽  
Assel K. Toktabaeva ◽  
Zharylkasyn A. Abilov
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Sorption Process ◽  
Reagent Concentration ◽  
Polycarboxylic Acid ◽  
Polymethacrylic Acid ◽  
Cross Link ◽  
Ionic Force ◽  
Equilibrium Swelling ◽  
Hydrophobic Nature

The sorption immobilization of richlokain on gels of polyacrylic acid (PAAG) or polymethacrylic acid (PMAAG) has been studied. By a number of methods – equilibrium swelling, potentiometry, IR-spectroscopy, and sorption it has been shown that binding of richlokain with these gels leads to the complex formation owing to the electrostatic interaction, which is stabilised by the hydrophobic and hydrogen bonds. Effect of an ionic force, reagent concentration, cross-link degree, hydrophobic nature of gels, and pH of solutions on the sorption process has been studied.

Complex Formation of Europium(III) with Photoditazine According to Luminescence and IR Spectroscopy

2020 ◽  
Vol 65 (3) ◽  
pp. 329-334
Author(s):  
N. I. Steblevskaya ◽  
M. A. Medkov ◽  
M. V. Belobeletskaya
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation

scholarly journals The studies of complex formation of metal borides in the reaction system of epoxidation of 1-octene with tert-butyl hydroperoxide by IR spectroscopy

2007 ◽  
Vol 1 (3) ◽  
pp. 127-129
Author(s):  
Oksana Makota ◽  
◽  
Yuriy Trach ◽  
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Spectroscopic Analysis ◽  
Reaction System ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Infrared Spectroscopic Analysis ◽  
Tert Butyl Hydroperoxide ◽  
Metal Borides ◽  
Molybdenum Boride

The complex formation of molybdenum and vanadium borides in the reaction system of 1-octene epoxidation with tert-butyl hydroperoxide by infrared spectroscopic analysis was studied. It was shown that 1-octene formed complex with metal moiety in a case of molybdenum boride and with boron moiety in a case of vanadium boride.

scholarly journals Calix[4]arene-click-cyclodextrin and supramolecular structures with watersoluble NIPAAM-copolymers bearing adamantyl units: “Rings on ring on chain”

2010 ◽  
Vol 6 ◽  
pp. 784-788 ◽  
Author(s):  
Bernd Garska ◽  
Monir Tabatabai ◽  
Helmut Ritter
Keyword(s):  
Mass Spectrometry ◽  
Light Scattering ◽  
Ir Spectroscopy ◽  
Complex Formation ◽  
Dynamic Light Scattering ◽  
Click Reaction ◽  
Supramolecular Complex ◽  
H Nmr ◽  
Microwave Assisted ◽  
Ph Dependent

We describe the calixarene-cyclodextrin-coupling via click reaction starting from 5,11,17,23-tetra-tert-butyl-25,27-dipropargylether-26,28-hydroxy-calix[4]arene (calix[4]arene-dipropargylether) (2) onto 6I-azido-6I-deoxycyclomaltoheptaose (3) under microwave assisted conditions. The coupling was proven by MALDI-TOF mass spectrometry, 1H NMR and IR-spectroscopy. The pH dependent supramolecular complex formation with poly(NIPAAM) bearing attached adamantyl units was investigated by dynamic light scattering (DLS) and turbidity measurements.

STUDY THE INTERPHASE DISTRIBUTION OF NICOTINIC ACID IN EXTRACTION SYSTEMS BASED ON POLY-N-VINYLFORMAMIDE

2021 ◽  
Author(s):  
Н.Я. МОКШИНА ◽  
О.А. ПАХОМОВА ◽  
И.О. БАКЛАНОВ ◽  
Л.А. МАРЧЕНКО
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Nicotinic Acid ◽  
Polymer Concentration ◽  
Distribution Coefficients ◽  
Water Soluble ◽  
Uv Spectrophotometry ◽  
Water Soluble Polymer ◽  
Interphase Distribution ◽  
Water Salt

Разработан способ извлечения никотиновой кислоты из водных растворов с применением водорастворимого полимера в качестве экстрагента. Исследовано комплексообразование в экстракционных системах с применением жидкостной экстракции. В качестве экстрагента синтезирован поли-N-винилформамид молекулярной массой 25 ∙ 103 г/моль. Для экстракции никотиновой кислоты применены высаливатели сульфат и хлорид аммония. Рассчитаны коэффициенты распределения – от 36 до 215 и степень извлечения аналита – от 87,8 до 98,8%. Эксперимент проводили при рН 6–7, в этих условиях никотиновая кислота находится в растворе в виде биполярного иона. Методом ИК спектроскопии изучено комплексообразование в экстракционных системах. Установлено, что цвиттер-ионы никотиновой кислоты образуют прочные комплексы с водой. На основании результатов ИК спектроскопии предложен механизм взаимодействия никотиновой кислоты с водой и поли-N-винилформамидом, позволяющий объяснить результаты межфазного распределения витамина в экстракционных системах. Установлены условия, при которых достигается практически полное извлечение никотиновой кислоты: рН водно-солевого раствора 6–7, концентрация полимера 0,2 г/см3 и высаливателя 20% масс. Проведено сравнение экстракционных характеристик, полученных с поли-N-винилформамидом и другими полимерами. Установлено, что применение в качестве экстрагента поли-N-винилформамида обеспечивает практически 99%-е извлечение никотиновой кислоты, что превышает этот показатель по сравнению с другими полимерами до 96% и органическими растворителями до 45%. Определение никотиновой кислоты в водном растворе проведено методами УФ спектрофотометрии по собственному поглощению при 262 нм или капиллярного электрофореза. A method for extracting nicotinic acid from aqueous solutions using a water-soluble polymer as an extractant has been developed. Complex formation in extraction systems using liquid extraction is investigated. Poly-N-vinylformamide with a molecular weight of 25 ∙ 103 g/mol was synthesized as an extractant. For the extraction of nicotinic acid, salting agents (ammonium sulfate and chloride) were used, distribution coefficients and the degree of analyte extraction were calculated. The distribution coefficients – from 36 to 215 and the degree of analyte extraction – from 87,8 to 98,8% were calculated. The experiment was performed at pH 6–7, under these conditions, nicotinic acid is in solution as a bipolar ion. Complex formation in extraction systems has been studied by IR spectroscopy. It was found that the zwitterions of nicotinic acid form strong complexes with water. Based on the results of IR spectroscopy, a mechanism for the interaction of nicotinic acid with water and poly-N-vinylformamide is proposed, which allows us to explain the results of interphase distribution of vitamin in extraction systems. The conditions under which almost complete extraction of nicotinic acid is achieved (the 6–7 pH of the water-salt solution, the polymer concentration are 0,2 g/cm3and the salting agent is 20% by weight) are established. The extraction characteristics obtained with poly-N-vinylformamide and other polymers were compared. It was found that the use of poly-N-vinylformamide as an extractant provides almost 99% recovery of nicotinic acid, which exceeds this indicator in comparison with other polymers by up to 96% and organic solvents by up to 45%. Determination of nicotinic acid in an aqueous solution was performed by UV spectrophotometry based on self-absorption at 262 nm and capillary electrophoresis.

Complex formation in liquid diethyl ether-chloroform mixtures examined by 2D correlation MID-IR spectroscopy

2016 ◽  
Vol 1124 ◽  
pp. 117-124 ◽  
Author(s):  
Andrii Kutsyk ◽  
Oleksii Ilchenko ◽  
Yuriy Pilgun ◽  
Vyacheslav Obukhovsky ◽  
Viktoria Nikonova
Keyword(s):  
Ir Spectroscopy ◽  
Complex Formation ◽  
Diethyl Ether
Sign in / Sign up

Export Citation Format

Share Document