prov:value
| - An iodine-doped complex or mixtures thereof with iodine having the formula II ##STR6## in which M is a divalent metal atom belonging to the group consisting of Fe, Co, Ni, Cu, Zn, Pd and Pt, R1 and R2 independently of one another are a hydrogen atom or alkyl, cycloalkyl, aryl, aralkyl, alkaralkyl or acyl each of which is unsubstituted or substituted, R3, R4, R5 and R6 independently of one another
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