ОБРАЗОВАНИЕ СМЕШАНОЛИГАНДНЫХ КОМПЛЕКСОВ Cu(II) НА ОСНОВЕ КОМПЛЕКСОНОВ СРЕДНЕЙ ДЕНТАТНОСТИ
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| Title |
ОБРАЗОВАНИЕ СМЕШАНОЛИГАНДНЫХ КОМПЛЕКСОВ Cu(II) НА ОСНОВЕ КОМПЛЕКСОНОВ СРЕДНЕЙ ДЕНТАТНОСТИ
FORMATION OF COPPER(II) MIXED-LIGAND COMPLEXES ON THE BASIS OF MEDIUM DENTATE COMPLEXONES |
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| Creator |
Кутолей, Денис Алексеевич
Безбородько, Сергей Анатольевич Штеменко, Александр Васильевич |
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| Subject |
гидроксиэтилидендифосфоновая кислота
N-(2-гидроксиэтил)иминодиуксусная кислота смешанолигандные комплексы ионы меди 1 – hydroxyethylydene diphosphonic acid N-(2-hydroxyethyl) iminodiacetic acid mixed ligand complex compounds cupric ions |
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| Description |
Методами спектрофотометрии и ионометрии исследовано комплексообразование ионов Cu2+ с 1-гидроксиэтилидендифосфоновой кислотой и N-(2-гидроксиэтил)иминодиуксусной кислотой в присутствии двух дополнительных низкодентантных лигандов – 2-аминоэтанола и этилендиамина в водных растворах. Показано образование смешанолигандных комплексных соединений и рассчитаны их константы устойчивости.
The complex formation of cupric ions Cu2+ with 1 – hydroxyethylydene diphosphonic acid and N-(2-hydroxyethyl) iminodiacetic acid in the presence of such additional low dentate ligands as 2 – amino ethanol and ethylene diamine in aqueous solutions was researched by spectrophotometric and ionometric methods. Formation of mixed ligand complex compounds was shown and their stability constants were calculated. There are some poly-metal complex compounds with the central metal ion which maximum coordination capacity is not achieved and such complexes are unsaturated by ligands, so they have high reaction ability. It makes possible to provide the purposeful synthesis of complex compounds with specified parameters, namely coordination sphere content, stability, ratio of different ligands. The complex formation of cupric ions Cu2+ with 1 – hydroxyethylydene diphosphonic acid (HEDPH) and N-(2-hydroxyethyl) iminodiacetic acid (HEIDA) in the presence of such additional low dentate ligands as 2 – amino ethanol and ethylene diamine in aqueous solutions was researched by spectrophotometric and ionometric methods. Formation of binuclear different-ligand hydroxyethylydene diphosphonates was investigated by spectrophotometric method of “permanent molar series”. The location of absorption maximum of copper(II) complex with 1 – hydroxyethylydene diphosphonic acid essentially depends on the second ligand presence. The complexes containing copper(II) : HEDPH : low-dentate ligand and their stability constants were determined by potentiometric titration method followed by computer modelling. Formation of mixed-ligand complexes consisting of copper(II) : HEIDA : low-dentate ligand was examined by spectrophotometric method. The complex particles accumulation occurs at pH 7.0-8.0 in water solutions containing two different ligands. The constants of ligand adjunction and general stability constants of mixed-ligand complexes of 1 – hydroxyethylydene diphosphonic acid and N-(2-hydroxyethyl) iminodiacetic acid with additional ligands 2 – amino ethanol and ethylene diamine were calculated. The ethylene diamine complexes possess larger stability constants then the similar complexes of 2 – amino ethanol both for HEDPH and HEIDA. The complex particles [Cuheidamea] and [Cuhedpamea]2- have close value of adjunction constants so it could be an evidence of their similar structure. The constants of additional ligands adjunction for [Cuhedpaen]2- and [Cuheidaen] complexes differ considerably because of supposedly bidentate effect of ethylene diamine in such different-ligand complexes unlike 2 – amino ethanol. The binuclear complexonates of N-(2-hydroxyethyl) iminodiacetic acid both homo- and hetero-ligand were not detected under experimental conditions. It could be explained by steric difficulties for this ligand to form binuclear different - ligand complexes. |
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| Date |
2013-04-10T16:33:49Z
2013-04-10T16:33:49Z 2013 |
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| Type |
Article
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| Identifier |
2074-6652
http://ea.donntu.edu.ua/handle/123456789/18375 |
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| Relation |
Наукові праці ДонНТУ;Серія: Хімія і хімічна технологія, 2013. - Вип.1(20). - С.64-68
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| Publisher |
Донецк, ДонНТУ
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