Charge transfer complexes of some diazines with p-benzoquinone derivatives

ABSTRACT

Charge transfer complexes formed between chloranilic acid [I], dichlorodicyano-p-benzoquinone [II] and chloranil as electron acceptor and pyrimidine. Pyrazine and their 2-amino derivatives as electron donors are prepared. The structure of the isolated solid complexes has been investigated using elemental analysis and IR-spectroscopy. The results reveal the formation of CT complexes of the salt type with [I] as acceptor and molecular complexes with II and III as acceptors. The study indicates the feasibility of the protonation of the heterocyclic nitrogen under the reaction in absence of the aliphatic amino group as in cases of the first two donors. The study indicates that diazines are mainly pi-donors