Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Polish Journal of Chemistry

1 2004

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: competitive potentiometry

Sortuj według:

Ogranicz wyniki do:

Competitive Potentiometric study of a Series of 18-Crown-6 with Pb2+, Ag+, and Tl+ Ions in Methanol Using Ag+/Ag Electrode

Zolgarnein J., Azimi G., Habibi M.

Polish Journal of Chemistry

2004

Vol. 78 / nr 6

795-802

The complexation of Ag+, Tl+ and Pb2+ with 18-crown-6 (18C6), dibenzo-18-crown-6 (DB18C6), dicyclohexyl-18-crown-6 (DCY18C6), and dibenzopyridino-18-crown-6 (DBPY18C6) in methanol solution have been studied by a competitive potentiometry, using Ag+/Ag electrode as a sensor. The stoichiometry and stability constants of resulting complexes have been evaluated by MINIQUAD program. The stoichiometry for all resulting complexes was 1:1. The order of stability of Ag+ complexes with used crown ethers varied as DBPY18C6 > DCY18C6 > 18C6 > DB18C6. For Pb2+, and Tl+ , the sequence of stability of complexes with each of these crown ethers (except of DBPY18C6) varied in the order Pb2+>Ag+>Tl+ . The major trend of stability of resulting complexes of these macrocycle with Pb2+ and Tl+ varied in the order DCY18C6 > 18C6 > DBPY18C6 > DB18C6 with few exceptions.