The charge transfer complex is chemical association between donor and acceptor species.
Moreover, the oscillator strength (f) , energy of charge transfer complex (ECT) , resonance energy (RN) , dipole moment (u)  and ionization potential (Ip)  were determined.
Oves, Synthesis, characterization, spectrophotometric, structural and antimicrobial studies of the newly charge transfer complex of p-phenylenediamine with I acceptor picric acid, Spectrochim.
Keywords: Charge transfer complexes, Antihistamines, Curcumin, Benesi-Hildebrand plot
Therefore, it is of much importance and interesting to study the charge transfer complexes of drugs with various I or I-acceptors for qualitative and quantitative analysis of drugs in their pure form as well as in pharmaceutical formulations.
Furthermore, solid charge transfer complexes were synthesized and characterized by FT-IR spectroscopy.
Out of five newly formed charge transfer complexes, desloratadine and levocetirizine with curcumin appeared as deep red and pale yellow respectively, whereas promethazine, loratadine and diphenhydramine had yellowish-orange colour nearly similar to each other.
We have described a spectrophotometric method to determine five antihistaminic drugs (promethazine, desloratadine, levocetirizine, diphenhydramine and loratadine) via analysing their charge transfer complexes with curcumin in active pharmaceutical ingredients.
Sultana, Charge Transfer Complexes of Gamma Aminobutyric Acid-Analogue, A Neurotransmitter: Synthesis and Spectrophotometric Determination, J.