Dear Manikandan, sorry to see that your interesting technical question has not yet received any expert answers. The reason for this might be that the question is perhaps a bit too unspecific. The main differences between the parent pyridine and basic biphenyl compounds (e.g. benzidine) and the corresponding salts is their solubility. The parent compounds are normally soluble in organic solvents such as diethyl ether or acetone, whereas typical salts derived thereof are normally water-soluble. For example, you can dissolve a pyridine derivative in diethyl ether and add the calculated amount of concentrated HCl. This will lead to precipitation of the corresponding pyridine hydrochloride. This can be isolated by filtration and drying. The resulting salt is a water-soluble derivative.
I hope this gives you some initial ideas. Good luck with your work!
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