Abstract
A novel pyrazoline with benzimidazole substituent was conveniently synthesized, starting from a chalcone and 2-hydrazinylpyridine. The addition of Ni2+ to ethanol solution of the synthesized pyrazoline resulted in a rapid color change from blue to green which allows the selective detection of Ni2+ ion over a great number of other metal ions. The association constant for the 1:1 complex was determined to be 2.72×107M−1.
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