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Blue potassium solution in THF containing 18‐crown‐6 was investigated by means of 39K NMR spectroscopy. The presence of potassium anions and complexed potassium cations was demonstrated. Spin‐lattice and spin‐spin relaxation times were measured in the temperature range 176–295 K. An attempt was made to explain the relaxation behaviour in the system.
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Sokół et al. (1990) studied this question.
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