Application of UV–Vis spectrophotometric process for the assessment of indoloacridines as free radical scavenger

A conventional approach has been used to synthesis Indole fused acridine, 4a–e. In this paper to achieve the target molecule, 4 the reaction was performed via two steps. In step 1, there was a reaction between Carbazolone, 1 and benzophenone, 2 to get dihydroindoloacridine, 3. In step 2, compound, 3 was treated with 5% Palladium/Carbon in the presence of diphenyl ether for 5h to give a dark brown product, 4. The column chromatography was used to purify final product, 4. All the synthesized compounds such as 3 and 4 were characterized by melting point, FTIR, 1H NMR, and Mass spectra. Further to check the purity of the compounds it was subjected to CHN analyzer. The target molecules such as 3 and 4 were screened for antimicrobial studies against bacteria such as Bacillus subtilis (B. subtilis), Staphylococcus aureus (S. aureus), Klebsiella pneumonia (K. pneumonia), Salmonella typhi (S. typhi); and fungi like Aspergillus niger (A. niger), Aspergillus fumigatus (A. fumigatus). The obtained results clearly proves that the target molecules shown reasonable activity against K. pneumonia and A. niger. Further the compounds were screened for free radical scavenging activity using 2,2-diphenyl-1-picrylhydrazyl (DPPH). The free radical scavenging property was performed using UV–Visible spectroscopy. The results were compared with the standard BHT (Butylated Hydroxy Toluene). Compounds, 4a and 4e were shown higher percentage of inhibition when compare to the standard. The result confirms that further research on indoloacridine will leads effective drug to the market. [Display omitted] •Conventional approach for the synthesis of indole fused acridine has been adopted.•All compounds have been well characterized.•Free radical scavenging activity has been screened.•Antimicrobial screening for the compounds, 4a–e was performed.•Biologically active compounds were achieved.