ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Electron paramagnetic resonance study of ion pairs of manganese(II) ions with oxalate, malonate, and succinate ions

Ľ. Treindl and A. Olexová

Department of Physical Chemistry, Faculty of Natural Sciences, Komenský University, 801 00 Bratislava

Abstract: The assocn. of manganese(II) ions with oxalate, malonate, and succinate ions was studied as a two-step equil. process. The 1st step corresponds to Mn(II)a_q + L_aq^2- = Mn(H₂O)L_aq (K₁) and the 2nd one to Mn(H₂O)L_aq = MnL_aq (K₂). In all 3 cases, values of the equil. consts. K₁ and K₂ were detd. at 25° using ESR from the dependence of the signal intensity of Mn(II) ions on the concn. of the carboxylate ions. The assocn. consts. of the ion pairs decrease in the series oxalate < malonate < succinate, analogous to a decrease of the hydration entropy of the corresponding inner-sphere complexes.

Full paper in Portable Document Format: 291a5.pdf

Chemical Papers 29 (1) 5–8 (1975)