کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5413328 | 1506622 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction of oxovanadium(IV) with carboxylic ligands in aqueous solution: A thermodynamic and visible spectrophotometric study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The hydrolysis of VO2+ and the complex with sulfate were studied potentiometrically, spectrophotometrically and calorimetrically, in NaCl aqueous solution (0 < I â¤Â 1 mol Lâ 1) and at t = 25 °C. The formation of two hydrolytic species VO(OH)+ and VO2(OH)22+ and one complex with sulfate was found, with log β = â 5.65 for the reaction VO2+ + H2O = VO(OH)+ + H+, log β = â 7.02 for the reaction 2VO2+ + 2H2O = (VO)2(OH)22+ + 2H+ and log K = 1.73 for VOSO40 species (at I = 0.1 mol Lâ 1 and t = 25 °C). For these species, using calorimetric data, ÎH and TÎS values were also obtained. By using the above values, interactions of VO2+ with acetate (ac), malonate (mal), succinate (suc), 1,2,3-propanetricarboxylate (tca) and 1,2,3,4-butanetetracarboxylate (btc) ligands were studied potentiometrically and spectrophotometrically. The formation of ML+, ML20 and MLOH0 for ac; ML0, MLH+, ML22â and ML2Hâ for mal; ML0, MLH+ and MLOHâ for suc; MLâ and MLH0 for tca and ML2â, MLHâ and MLH20 for btc were found. Formation constants are reported at I = 0.1 mol Lâ 1, together with SIT parameters for the dependence on ionic strength. By visible spectrophotometric measurements, λmax and εmax values for the relevant species in solution were determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 142, Issues 1â3, 20 August 2008, Pages 57-63
Journal: Journal of Molecular Liquids - Volume 142, Issues 1â3, 20 August 2008, Pages 57-63
نویسندگان
Silvia Berto, Pier G. Daniele, Claudia Foti, Enrico Prenesti, Silvio Sammartano,