Study of the Stability of Some Ion-Pairs in Non-Aqueous Solutions by Potentiometric and Spectrophotometric Methods

• Autorzy: Gorodkiewicz E. , Figaszewski Z.
• Języki publikacji: EN

Abstrakty

EN

Changes in selected complexes caused by photodissociation were studied potentiometrically by measuring the time dependence of electromotive force of suitable cells and spectrophotometrically by measuring the time dependence of absorbance to evaluate the stability constants. Ion pairs labetalol (LAB)-reineckate (REINE) in nitromethane and crystal violet (CV)-tetrachloroferrate(III) (FeCl4) in tetrachloroethane were used. The concentration ranges were determined, in which the EMF variations are greatest: the 4-5.5 × 10-4 mol l-1 range for the LAB-REINE complex and the 0.9-3 × 10-6 for the CV-FeCl4 complex. Linear dependence of the EMF variation on the intensity of radiation, as well as a slight effect of temperature on irradiated solution were found. The stability constants of the studied complexes in chloroform, determined directly from spectrophotometric measurements are log Beta av = 6.6 for LAB-REINE complex and log av = 7.3 for the CV-FeCl4 complex.

Słowa kluczowe

EN

stability constants; ion pairs; non-aqueous solution; spectrophotometry; potentiometry

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2001
• Tom: Vol. 75, nr 1
• Strony: 127--133
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Gorodkiewicz E.

• Al. J. Piłsudskiego 11/4, 15-443 Białystok, Poland

autor

Figaszewski Z.

• Al. J. Piłsudskiego 11/4, 15-443 Białystok, Poland

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