Conducting polymers were synthesized by doping polyaniline chloride with Schiff bases such as (E)-2-((4s-chlorobenzylidene)amino)-3-(3a,7a-dihydro-1H-indol-3-yl)propanoic acid (TP4ClB) and (E)-3-(3a,7a-dihydro-1H-indol-3-yl)-2-((2-hydroxy-3,5-diiodobenzylidene)amino) propanoic acid (TPDISA). A chemical oxidation method using potassium persulphate as an oxidising agent was followed for the preparation of polymers. The prepared polymers were characterized by UV-Visible, FTIR and H 1 NMR spectroscopic techniques. The adsorption characteristics of Polymeric composites for the removal of mercuric ion was studied through batch process. Sorption isotherms were constructed using Langmuir, Freundlich, Dubinin Radush Kevich, Temkin and Redlich Peterson models. SEM micrograph, PXRD and EDX spectra were also recorded to confirm the metal ion adsorption on the surface of investigated composites.

Indole group containing four different Schiff bases such as 2-((2-hydroxybenzylidene)amino)-3-(1H-indol-3-yl)propanoic acid, 2,2'-((1Z,1'E)-(1,4-phenylenebis(methanylylidene))bis(azanylylidene)) bis(3-(3a,7a-dihydro-1H-indol-3-yl)propanoic acid), (E)-2-((2-chlorobenzylidene)amino)-3-(3a,7adihydro-1H-indol-3-yl)propanoic acid and (E)-2-((4-chlorobenzylidene)amino)-3-(3a,7a-dihydro-1H-indol-3-yl)propanoic acid were synthesized from Tryptophan and respective aldehydes namely Salicylaldehyde, Terephthalaldehyde, 2-Chlorobenzaldehyde and 4-Chlorobenzaldehyde. A polymeric composite was prepared by doping the Schiff base derived from salicylaldehyde on polyaniline chloride. These compounds were characterized by Fourier-transform infrared (FTIR), UV-Visible, 1 H-NMR spectroscopic techniques. The Schiff Bases and polymer have been examined for their antimicrobial activity. Antibacterial and antifungal activities of all the compounds were studied by Kirby Bauer Agar well diffusion method. In addition Anti-Tubercular study was also performed. It has been found that all the five compounds have remarkable antimicrobial activity.

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