Abstract
Dimethylsulphoxide (DMSO) produces a strong ultraviolet contact charge transfer (CCT) absorption band with oxygen (O 2) with an intensity directly proportional to the partial pressure of the applied O 2 and the mole percentages of DMSO in a DMSO/acetonitrile solvent mixture. The CCT absorption spectrum is similar to, but much weaker than, that of the superoxide (O 2 −) ion in DMSO. Superoxide ions are also produced by adding a small amount of sodium hydroxide (NaOH) to DMSO. Electron spin resonance spectroscopy confirms the presence of O 2 − ions in a 5 mmol dm −3 NaOH, 1% (v/v) water in DMSO solution but no spectrum is observed in an oxygenated DMSO solution at 77 K.
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