Study of IR and NMR spectral correlations and biological evaluation of 4-(6-ethyl-2-(substituted phenyl)-6H-pyrido[3,2-b]carbazol-4-yl) aniline derivatives

A series of seven titled compounds have been prepared and their purities were examined by literature method. The characteristic infrared stretching frequencies (, cm-1) and the NMR chemical shifts (, ppm) of these anilines were assigned. These assigned spectral data were correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the statistical results the effect of substituents on the spectral data have been discussed. The antimicrobial activities of these aniline derivatives have been evaluated by Bauer-Kirby disc-diffusion method.