Aromatic polynitro compounds, charge

Metal salts are good initiators of the charge-transfer polymerization of A -vinylcarbazole. Some oxidizing metal salts have been shown by ESR spectroscopy to be involved in an electron-transfer mechanism [62,63]. Polynitro compounds are also reported to be involved in a charge-transfer initiation process of the polymerization of A-vinylcarbazole [64]. Aromatic nitro com-poimds have similar properties [65]. The polymerization reaction has been reviewed [66]. 

As well as the cr-complexes discussed above, aromatic molecules combine with such compounds as quinones, polynitro-aromatics and tetra-cyanoethylene to give more loosely bound structures called charge-transfer complexes. Closely related to these, but usually known as Tt-complexes, are the associations formed by aromatic compounds and halogens, hydrogen halides, silver ions and other electrophiles. 

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