Monatshefte für Chemie / Chemical Monthly

, Volume 125, Issue 2, pp 107–117 | Cite as

Studies on the equilibria in Ag(I) - 1,4,8,11-tetraazacyclotetradecane and Ag(I) - 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane systems in water

  • A. Grzejdziak
Anorganische Und Physikalische Chemie

Summary

Protonation constants of 1,4,8,11-tetraazacyclotetradecane (T ACT) and 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (TMT ACT) (μ=0.1) were determined bypH-metry. The values are logK1=10.922, logK2=10.511, logK3=2.646, logK4=1.620 forT ACT, and logK1=9.387, logK2=9.050, logK3=2.491, logK4=1.380 forTMTACT. Absorption maxima of the complexes AgTA CT(NO3)2 and AgTMTACT(NO3)2 were found to be λ1=280 nm, λ2=350 nm, and λ1=290 nm, λ2=400 nm, respectively. The disproportionation constants of Ag(I) ions in the presence of the amines were determined by potentiometry: forTA CT logK d =12.778, and forTMT ACT logK d =11.778. The mechanisms of the electrode processes taking place in solutions of the complexes under investigation were examined by means of chronovoltamperometric and coulometric measurements. The formal potential,E f 0 , of the system: AgTMT ACT2++e ⇆AgTMT ACT+ is +0.450 V vs. NHE.

Keywords

Chronovoltammetry Coulometry Formal potential Redox systems Silver complexes Tetraazamacrocyclic amines Water 

Untersuchungen zu den Gleichgewichten Ag(I) -1,4,8,11-Tetraazacyclotetradekan und Ag(I) -1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradekan in Wasser

Zusammenfassung

Die Protonierungskonstanten von 1,4,8,11-Tetraazacyclotetradekan (TACT) und 1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradekan (TMT ACT) wurdenpH-metrisch bei μ=0.1 bestimmt. Folgende Werte wurden ermittelt: logK1=10.922, logK2=10.511, logK3=2.646, logK4=1.620 fürTACT und logK1=9.387, logK2=9.050, logK3=2.491, logK4=1.380 fürTMT ACT. Die Absorptionsmaxima der Komplexe AgTACT(NO3)2 und AgTMTACT(NO3)2 waren λ1=280 nm, λ2=350 nm, bzw. λ1=290 nm, λ2=400 nm. Die Disproportionierungskonstanten der Ag(I)-Ionen in Gegenwart der Amine wurden potentiometrisch bestimmt: logK d =12.778 fürTACT und logK d =11.778 fürTMTACT. Der Mechanismus des Elektrodenprozesses in den Komplexlösungen wurde mittels Chronovoltamperometrie und Coulometrie überprüft. Das formale PotentialE f 0 des Systems AgTMT ACT2++e⇆AgTMT ACT+ ist +0.450 V gegenüber NHE.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Hinz F. P., Margerum D. W. (1974) Inorg. Chem.13: 2941Google Scholar
  2. [2]
    Kodama M., Kimura E. (1976) J. Chem. Soc., Dalton Trans.: 116Google Scholar
  3. [3]
    Kodama M., Kimura E. (1976) J. Chem. Soc., Dalton Trans.: 2341Google Scholar
  4. [4]
    Anichini A., Fabbrizzi L., Paoletti P. (1977) Inorg. Chem. Acta22: L25Google Scholar
  5. [5]
    Micheloni M., Sabatini A., Paoletti P. (1978) J. Chem. Soc. PerkinII: 828Google Scholar
  6. [6]
    Buoen S., Dale J., Krane J. (1984) Acta Chem. Scand.B38: 773Google Scholar
  7. [7]
    Kodama M., Kimura E. (1978) J. Chem. Soc., Dalton Trans.: 104Google Scholar
  8. [8]
    Kodama M., Kimura E., Yamaguchi S. (1986) J. Chem. Soc., Dalton Trans.: 104Google Scholar
  9. [9]
    Kestner M. O., Allred A. L. (1972) J. Am. Chem. Soc.94: 7189Google Scholar
  10. [10]
    Barefield E. K., Mocella M. T. (1973) Inorg. Chem.12: 2829Google Scholar
  11. [11]
    Clark I. J., Mac B. Harrowfield J. (1984) Inorg. Chem.23: 3740Google Scholar
  12. [12]
    Ignaczak M., Grzejdziak A., Abraszewski A. (1982) Polish J. Chem.56: 609Google Scholar
  13. [13]
    Ignaczak M., Grzejdziak A. (1986) Polish J. Chem.60: 347Google Scholar
  14. [14]
    Motekajtis R. I., Martell A. E. (1982) Can. J. Chem.60: 168Google Scholar
  15. [15]
    Izquierdo A., Beltran J. L. (1986) Anal. Chim. Acta181: 87Google Scholar
  16. [16]
    Ronco S., Van Vlierberge B., Ferraudi G. (1988) Inorg. Chem.27: 3453Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • A. Grzejdziak
    • 1
  1. 1.Department of General and Inorganic ChemistryUniversity of LódźLódźPoland

Personalised recommendations