Study of Kryptofix5 Complexation with La3+ Cation in Several Individual and Binary Nonaqueous Solvents Using Conductometric Method


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Аннотация

Complexatio of the La3+ cation with 1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane(Kryptofix5) was studied in pure solvents acetonitrile (AN), methanol (MeOH), nitrobenzene (NB), tetrahydrofuran (THF), methyl acetate (MeOAC) and in various binary solvent mixtures of AN–MeOH, AN–NB, AN–THF, and AN–MeOAC systems at different temperatures using the conductometric method. The stoichiometry of the complex was found to be 1 : 1 (ML). In all cases, the variation of the log kf with composition of the solvent was non-linear. This behavior is probably due to a change in the structure of these binary mixed solvents as the composition of the medium is varied. The stability order of the complex in pure nonaqueous solvents at 25°C increases in the order: AN > THF > MeOAC > MeOH > NB. The values of thermodynamic data (ΔHc°,ΔSc°) formation of (Kryptofix5.La)3+ complex are definitely solvent dependent.

Авторлар туралы

Setareh Akbari

Department of Chemistry, Mashhad Branch

Email: rskhoshnood@yahoo.com
Иран, Mashhad

Razieh Khoshnood

Department of Chemistry, Mashhad Branch

Хат алмасуға жауапты Автор.
Email: rskhoshnood@yahoo.com
Иран, Mashhad

Elaheh Hatami

Department of Chemistry, Mashhad Branch

Email: rskhoshnood@yahoo.com
Иран, Mashhad

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