Charge Transfer Complexes of Some Heterocyclic Aromatic Amines with π‐Organic Acceptors in Polar Solvents

Abstract

A conductometric titration technique has been used to investigate the electron transfer activity of CT molecular complexes formed by arylazopyrimidine and naphthylazopyrimidine derivatives as donors and the organic p-acceptors p-nitroaniline, p-chloroaniline, p-bromoaniline, anthraquinone, picric acid, anitroso-b-naphthol, p-hydroxybenzaldehyde and maleic anhydride. The study was performed at different degree of temperature and in three different polar solvents namely N,N-dimethylformamide (DMF), acetonitrile (ACN) and dimethylsulfoxide (DMSO). The stoichiometric ratios of these complexes were found to be 1:1. The dissociation constant (as M ) values of the formed complexes have been calculated, and the effects of solvents as well as types of electron donors on their conductance s p -values have been examined.

Comparative study and multiple linear regression analysis for assessment of chromatographic behavior of structurally related β‐blockers on different stationary phases

“…The DMF molecules are known to possess high electron donor properties through oxygen of its carbonyl moiety or the tertiary nitrogen . Similarly, urea provides high electron donation capability through two amino groups nitrogen atoms in addition to the carbonyl oxygen.…”

Conductometric Studies of Charge Transfer Complexes Interaction of Amino Pyridine with π- Acceptors

“…The complete proton transfer is not believed to occur then; partial protonation seems to be more probable mechanism for complex formation. Protonation of NH 2 group rather than the tertiary nitrogen atoms can be attributed to the higher -charge density on NH 2 group than that on hetero N-atom [ 46,47 ]. …”