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Zur Kenntnis der sogenannten «Alkalicarbonyle» VI Über den paramagnetischen Anteil der «Alkalicarbonyle»
Author(s) -
Büchner W.,
Lucken E. A. C.
Publication year - 1964
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19640470802
Subject(s) - chemistry , potassium , radical , ammonia , electron paramagnetic resonance , aqueous solution , liquid ammonia , salt (chemistry) , inorganic chemistry , molten salt , carbon monoxide , organic chemistry , catalysis , physics , nuclear magnetic resonance
The solid compounds resulting from the reaction between carbon monoxide and potassium, either molten or dissolved in liquid ammonia, have been shown by EPR. spectroscopy to contain low concentrations of free radicals. These solids dissolve in water to give deeply coloured solutions which also display EPR. spectra. It has been shown that the radical in the product formed from molten potassium at 250°C is mainly the potassium salt of tetrahydroxybenzosemiquinone, while the product from either molten potassium at 70°C or potassium dissolved in liquid ammonia contains at least two radicals. From the measurements made on the aqueous solutions, one of these has been shown to be the potassium salt of 2,5‐dihydroxy‐1,4‐benzosemiquinone. The other radical is thermally instable and is probably a non‐linear open‐chain radical. Dihydroxybenzoquinone seems to be formed during the removal of the ammonia.