Journal of Inclusion Phenomena and Macrocyclic Chemistry, ( ISI ), Volume (64), Year (2009-1) , Pages (49-56)

Title : ( Study of complex formation between 18-crown-6 and diaza-18-crown-6 with uranyl cation (UO2+) in some binary mixed aqueous and non-aqueous solvents )

Authors: محمد انصاری فرد , Glamhossein Ronagi , Mahmod CHamsaz , خلیل طاهری ,

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Abstract

The complexation reaction between UO2+ cation with macrocyclic ligand, 18-crown-6 (18C6), was studied in acetonitrile–methanol (AN–MeOH), nitromethane–methanol (NM–MeOH) and propylencarbonate–ethanol(PC–EtOH) binary mixed systems at 25o C. In addition, the complexation process between UO2+ cation with diaza-18-crown-6 (DA18C6) was studied in acetonitrile–methanol(AN–MeOH), acetonitrile–ethanol (AN–EtOH), acetonitrile–ethylacetate (AN–EtOAc), methanol–water (MeOH–H2O), ethanol–water (EtOH–H2O), acetonitrile–water (AN–H2O), dimethylformamide–methanol (DMF–MeOH), dimethylformamide–ethanol (DMF–EtOH), and dimethylformamide–ethylacetate (DMF–EtOAc) binary solutions at 25oC using the conductometric method. The conductance data show that the stoichiometry of the complexes formed between (18C6) and (DA18C6) withUO2+cation in most cases is 1:1 [M:L], but in some solvent 1:2 [M:L2] complex is formed in solutions. The values of stability constants (log Kf) of (18C6 _ UO2+) and (DA18C6 _ UO2+) complexes which were obtained from conductometric data, show that the nature and also the composition of the solvent systems are important factors that are effective on the stability and even the stoichiometry of the complexes formed in solutions. In all cases, a non-linear relationship is observed for the changes of stability constants (log Kf) of the (18C6 _ UO2+) and (DA18C6 _ UO2+) complexes versus the composition of the binary mixed solvents. The stability order of (18C6 _ UO2+) complex in pure studied solvents was found to be: EtOH > AN ~ NM >PC ~ MeOH, but in the case of (DA18C6 _ UO2+) complex it was : H2O > MeOH >EtOH.

Keywords

, 18-Crown-6, Diaza-18-crown-6, UO2+cation , Binary mixed aqueous and non-aqueous solvents , Conductometry.
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@article{paperid:1011693,
author = {محمد انصاری فرد and Ronagi, Glamhossein and CHamsaz, Mahmod and خلیل طاهری},
title = {Study of complex formation between 18-crown-6 and diaza-18-crown-6 with uranyl cation (UO2+) in some binary mixed aqueous and non-aqueous solvents},
journal = {Journal of Inclusion Phenomena and Macrocyclic Chemistry},
year = {2009},
volume = {64},
month = {January},
issn = {0923-0750},
pages = {49--56},
numpages = {7},
keywords = {18-Crown-6; Diaza-18-crown-6; UO2+cation ; Binary mixed aqueous and non-aqueous solvents ; Conductometry.},
}

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%0 Journal Article
%T Study of complex formation between 18-crown-6 and diaza-18-crown-6 with uranyl cation (UO2+) in some binary mixed aqueous and non-aqueous solvents
%A محمد انصاری فرد
%A Ronagi, Glamhossein
%A CHamsaz, Mahmod
%A خلیل طاهری
%J Journal of Inclusion Phenomena and Macrocyclic Chemistry
%@ 0923-0750
%D 2009

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