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It has been demonstrated spectroscopically that many nitrogen-containing heterocyclic compounds can form charge transfer complexes with iodine. The complexes of morpholine with iodine were shown to be of the n-sigma type with a 1:1 stoichiometry. A strong donor-acceptor interaction was found (Kc = 1261 +/- 12 mol-1 at 20 degrees C in CCl4), considerably higher than those of complexes of aromatic compounds with iodine. The high value of the formation constant for this complex indicated that morpholine could serve as a starting point for the synthesis of novel anti-thyroid drugs.

Spectroscopic analysis of charge transfer complexes between morpholine and iodine.