Spectroscopic, synthesis and structural studies of piperidine-chloranilic acid and piperidine-picric acid charge transfer complexes

Charge-transfer (CT) complexes formed between piperidine (Pip) as donor and chloranilic acid (CLA) and picric acid (PA) as acceptors have been studied spectrophotometrically. The synthesis and characterization of piperidine CT-complexes of chloranilic acid {[}(Pip)(2)(CLA)] (1) and picric acid {[}(Pip)(PA)] (2) are described. These complexes are readily prepared from the reaction of Pip with CLA and PA in MeOH and CHCl3. H-1-NMR, IR, elemental analyses, mass spectra, and UV-Vis techniques were used to characterize the two-piperidine charge-transfer complexes. Benesi-Hildebrand and its modification methods were applied in the determination of association constant (K) and the molar extinction coefficient (e).