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Four new thiourea derivatives namely 1-(2-aminophenyl)-3-(naphthlene-1-yl)thiourea, 3a, N-(2-aminophenyl)-N-(1naphthalenyl)thiourea, 3a’, 1-(3-aminophenyl)-3-(naphthalene-1-yl)thiourea, 3b, and 1,4-phenylene-bis[3-(α-naphthyl)thiourea], 3c have been synthesized by the reaction of 1-naphthyl isothiocyanate, 1a with 1,2-phenylenediamine, 2a, 1,3phenylenediamine, 2b, 1,4-phenylenediamine, 2c. The binding behavior of 3b for mercury ion was evaluated by ‘nakedeye’, H Nucleus Magnetic Resonance, Fourier Transformation Infrared, and UV-Vis titration methods. Stoichiometry of the host-guest complexation of 3b and mercury ion was found to be 1:1 by plotting molar-ratio curves.

SYNTHESIS OF THIOUREA DERIVATIVES AND BINDING BEHAVIOR TOWARDS THE MERCURY ION