Hydration State of Cu2+ in Mixed Cu2+-Hexadecylpyridinium Montmorillonite by Electron Spin Resonance

K. Dyrek1, Z. Klapyta2 and Z. Sojka1
1 Institute of Chemistry, Jagiellonian University, Cracow, Poland
2 Institute of Geology and Mineral Deposits, Academy of Mining and Metallurgy, Cracow, Poland

Abstract: Electron spin resonance (ESR) spectra of Cu2+-hexadecylpyridinium (HDP) montmorillonites were investigated as a function of HDP+ content and the hydration state of Cu2+ at relative humidities of p/p0 = 0.52−8 × 10−7 at 298°K. The symmetry of the Cu2+ ESR spectra and the intensity of the ESR signal increased upon dehydration of the complex. The HDP+ cation caused an increase in the hydration state of Cu2+ at a given p/p0 and an increase in the covalency of the Cu-O bond.

Key Words: Cation exchange • Copper • Electron spin resonance • Hexadecylpyridinium • Hydration • Montmorillonite

Clays and Clay Minerals; June 1983 v. 31; no. 3; p. 223-229; DOI: 10.1346/CCMN.1983.0310308
© 1983, The Clay Minerals Society
Clay Minerals Society (www.clays.org)