Synthesis and Characterization O-, M- and Para-Toluyl Thiourea Substituted Para-Pyridine and Ethyl Pyridine as a Chromoionophore

Abstract

Six new derivatives of carbonyl thiourea comprises of o-,m-and p-toluyl at one end of Nitrogen atom and p-methylpyridine or ethyl pyridine at another one end of Nitrogen atom has been synthesized. The compounds are All products shown two maximum absorption around 262 nm and 290 nm respectively for carbonyl C=O and thione C=S chromophore. Those both values contributed by n-п* transition. 1 H nuclear magnetic resonance spectrum showed presence of aromatic, methyl, methine and amide protons except for product III. All products showed presence of carbon thione in 13 C nuclear magnetic resonance except for product III. Ionophor interpretation with acetate anion shows color changes by naked eye for compound (I) and (III).