Conductimetric studies of charge transfer complexes of some benzylidene aniline Schiff bases with substituted p-benzoquinones

The charge transfer complexes formed between some benzylidine aniline derivatives and p-benzoquinones have been investigated conductimetrically. The results indicate the formation of 1:1 and 1:2 [D: A] complexes. The stoichiometric conductance sigma p and molar conductance of the complexes have been calculated at 22 degree. The effects of electron affinity of the acceptor, ionization potential of the donor and temperature have been investigated and discussed

Spectroscopic studies on pyrazine carboxylic acid and 2-aminopyridine-carboxylic acid

Since early studies [1] the field of pyrazine chemistry had received little attention. When advances in chemotherapy suggested new application for the less accessible substances, renewed interest in the pyrazine derivatives became evident. Pyrazines are aromatic compounds as well as tertiary amines, and their properties resemble those of the pyridines [2] The pyrazine nucleus may be considered as a resonance hybrid of which two of the contributing forms [1] and [2] are analogous to those of benzene. The high electronegativity of the nitrogen atom probably leads to significant additional contributions of from [3] which may have a definite influence on both the basic and aromatic properties of the pyrazines

Charge transfer complexes of some diazines with p-benzoquinone derivatives

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