Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

• A charge-transfer complex was synthesized and confirmed by spectral investigations.
• Spectroscopic studies were performed in different polar solvents acetone and methanol.
• X-ray Diffraction studies confirmed the crystal structure and nano range of the CTC.
• Spectroscopic studies reveal the formation of 1:1 CTC associated with proton transfer from A to D.
• TGA–DTA analyses were performed to further confirm the thermal degradation of the CTC.

The charge-transfer (CT) complex formed between 2,2′-bipyridine with 4-hydroxybenzoic acid has been studied in methanol and acetone at room temperature. The charge-transfer complex was characterized on the basis of FT-IR, 1H NMR, XRD studies of the solid CT complex, UV–Visible spectroscopy, thermogravimetric analysis (TGA–DTA) and conductivity and the results were discussed. The particle size and the energy of the charge-transfer complex were also determined. The data obtained from the spectroscopic studies indicate the formation of 1:1 charge-transfer complex, associated with a proton migration from the acceptor to the donor followed by intermolecular hydrogen bonding. The conductivity was found to increase with increase in the concentration of the donor.

Figure optionsDownload as PowerPoint slide