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Iranian Journal of Chemistry and Chemical Engineering، جلد ۲۰، شماره ۲، صفحات ۸۲-۸۹
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| عنوان فارسی |
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| چکیده فارسی مقاله |
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| عنوان انگلیسی |
A Thermodynamic Study of Complex Formation between 15-Crown-5 with Mg2+, Ca2+, Sr2+ and Ba2+ in Acetonitrile Methanol Binary Mixtures Using Conductometric Method |
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| چکیده انگلیسی مقاله |
The complexation reactions between Mg2+, Ca2+, Sr2+ and Ba2+ metal cations with 15-crown-5 (15C5) were studied in acetonitrile (AN)-methanol (MeOH) binary mixtures at different temperatures using conductometric method. 15C54 forms 1:1 complexes with Mg2+, Ca2+ and Sr2+ cations in solutions. The Ma2+ cation forms a 2:1 complex (ratio of lighand to cation) in solutions. A linear relation was observed for variation of logKf of 15C5-Ca2+ and 15C5-Sr2+ complexes vs the composition of An-MeOH binary systems, but a non-linear behavior was observed in the case of 15C5-Mg2+ complex in these binary mixtures. Selectivity of 15C5 for Mg2+, Ca2+ and Sr2+ cations is sensitive to solvent composition. In some cases and in certain compositions of the mixed solvent systems, the selectivity order is changed. The values of thermodynamic parameters (DH0c , DS0c ) for formation of 15C5-Mg2+ , 15C5-Ca2+ and 15C5-Sr2+ complexes were obtained from temperature dependence of stability constants and the results show that the thermodynamics of complexation reactions is affected by the nature and composition of the mixed solvents. |
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| نویسندگان مقاله |
غلامحسین رونقی | gholam hossein
department of chemistry, faculty of science ferdowsi university of mashhad, mashhad, i.r. iran
سازمان اصلی تایید شده: دانشگاه فردوسی (Ferdowsi university)
راضیه ثانوی خشنود | sanavi khoshnood
department of chemistry, faculty of science ferdowsi university of mashhad, mashhad, i.r. iran
سازمان اصلی تایید شده: دانشگاه فردوسی (Ferdowsi university)
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| نشانی اینترنتی |
http://www.ijcce.ac.ir/article_9974_d3433a9c8922af5c580458fccac63f9d.pdf |
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| زبان مقاله منتشر شده |
en |
| موضوعات مقاله منتشر شده |
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