Study of Complex Formation between Kryptofix 21 and UO22+ Cation in Some Binary Mixed Non-Aqueous Solutions

被引:0
作者
Nasiri, Maryam [1 ]
Rounaghi, Gholam Hossein [1 ]
机构
[1] Islamic Azad Univ, Mashhad Branch, Dept Chem, Mashhad, Iran
关键词
Kryptofix; 21; UO22+ cation; mixed non-aqueous solvents; conductometry; CROWN-ETHER; ACETONITRILE-WATER; MACROCYCLIC LIGAND; SELECTIVE REMOVAL; METAL-CATIONS; MEMBRANE; IONS; DIBENZO-18-CROWN-6; DIBENZO-24-CROWN-8; IONOPHORE;
D O I
10.1134/S102319351508008X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The complexation reaction between UO22+ cation and the macrocyclic ligand, Kryptofix 21, was studied in acetonitrile-methanol (AN-MeOH) and acetonitrile-ethylacetate (AN-EtOAc) binary solvent solutions at different temperatures using the conductometric method. In most cases, Kryptofix 21 forms a 1 : 1 [M : L] complex with the UO22+ cation. But in some of the studied solvent systems, 1 : 2 [M : L-2] and also 1 : 3 [M : L-3] complexes are formed in solutions. The results obtained in this study show that the mechanism of the complexation process between the uranyl cation and Kryptofix 21 changes with the nature and composition of the solvent system. In the case of the binary solvent solutions (mol % AN = 50 and 60), the order of stability constant of the complex at all studying temperatures was found to be: AN-EtOAc > AN-MeOH. The values of thermodynamic quantities (Delta S-c degrees, Delta H-c degrees) for the formation of (Kryptofix 21-UO2)(2+) complex were obtained from temperature dependence of the stability constant of the complex using the van't Hoff plots. The results show that the values of these parameters are influenced by the nature and composition of the mixed solvents and is most solvent systems, the 1 : 1 complexation reaction UO22+ between and the macro-cyclic ligand is athermic.
引用
收藏
页码:758 / 763
页数:6
相关论文
共 27 条
[1]  
Al-Mustafa J., 2004, J SOLUTION CHEM, V30, P681
[2]  
Ansarifard M, 2009, ASIAN J CHEM, V21, P2799
[3]   A new sodium ion selective electrode based on a novel silacrown ether [J].
Chandra, S ;
Lang, H .
SENSORS AND ACTUATORS B-CHEMICAL, 2006, 114 (02) :849-854
[4]   A 15-crown-5-functionalized carbosilane dendrimer as ionophore for ammonium selective electrodes [J].
Chandra, Sudeshna ;
Buschbeck, Roy ;
Lang, Heinrich .
TALANTA, 2006, 70 (05) :1087-1093
[5]   A novel iron(III) selective membrane electrode based on benzo-18-crown-6 crown ether and its applications [J].
Ekmekci, Guler ;
Uzun, Demet ;
Somer, Guler ;
Kalayci, Sukru .
JOURNAL OF MEMBRANE SCIENCE, 2007, 288 (1-2) :36-40
[6]   Study of complex formation between 18-crown-6 and diaza-18-crown-6 with uranyl cation (UO2 2+) in some binary mixed aqueous and non-aqueous solvents [J].
Fard, M. Ansari ;
Rounaghi, G. H. ;
Chamsaz, M. ;
Taheri, K. .
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY, 2009, 64 (1-2) :49-56
[7]   Zinc(II)-selective sensors based on dibenzo-24-crown-8 in PVC matrix [J].
Gupta, VK ;
Al Khayat, M ;
Minocha, A ;
Kumar, P .
ANALYTICA CHIMICA ACTA, 2005, 532 (02) :153-158
[8]   Fluorous ionic liquids as solvents for the liquid-liquid extraction of metal ions by macrocyclic polyethers [J].
Heitzman, H ;
Young, BA ;
Rausch, DJ ;
Rickert, P ;
Stepinski, DC ;
Dietz, ML .
TALANTA, 2006, 69 (02) :527-531
[9]   Potassium ion-selective membrane electrodes based on 1,3-alternatecalix[4]crown-5-azacrown-5 [J].
Kim, SG ;
Kim, H ;
Noh, KH ;
Lee, SH ;
Kim, SK ;
Kim, JS .
TALANTA, 2003, 61 (05) :709-716
[10]   KINETICS OF COMPLEXING OF ALKALINE-EARTH IONS WITH SEVERAL CRYPTANDS [J].
LOYOLA, VM ;
PIZER, R ;
WILKINS, RG .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1977, 99 (22) :7185-7188