ELECTRON SPIN RESONANCE STUDY OF SPIN PROBES IN FROZEN AQUEOUS SOLUTIONS. II. ICE STRUCTURE BREAKING EFFECTS OF ALKALI HYDROXIDES

Abstract The ESR spectra of 12-nitroxide stearic acid (12-NS) in frozen aqueous solutions of LiOH, KOH, and CsOH with temperature are composed of a sharp triplet and a broad singlet, as the case of frozen aqueous solutions of NaOH. As radius of alkali metal ion becomes larger, the strength of breaking ice structure increases at frozen state. The ice-structure-breaking effects of alkali ions are Cs+>K+>Na+>Li+ in frozen aqueous solutions.