Preparation and characterization of nickel complex with new azo ligand 1- (6-bromo-benzothiazolyl )‎-azo]-2-hydroxy-3-naphthoic acid (6-BrBTANA)‎

Abstract EN

A new heterocyclic azo dye 1-[(6-bromo-benzothiazolyl)-azo]-2-hydroxy-3- naphthoic acid (6-BrBTANA) was synthesized by coupling diazotized of (2-amino-6- bromo benzothiazol) (2-ABrBT) with 2-hydroxy-3-naphthoic acid in alkaline alcoholic solution.

The organic compound was characterized by elemental analysis and spectrophotometric method such as Infra-red and electronic spectra.

A sensitive and selective spectrophotometric method is proposed for the rapid determination of Nickel (II) using (6-BrBTANA), as anew spectrophotometric reagent.

The reaction between this reagent and Nickle (II) is instantaneous at max 614 nm and pH = 6 to form a violet complex having a molar ratio of 1:2 (Ni –6-BrBTANA) .The molar absorptivity of the complex is (1.112 * 104 L.mol-1.cm-1) and the stability constant was found to be 3.33 * 109 L2.mole-2.

The physical and spectral studies of the solid complex indicated octahedral coordination via N and O atoms of azo and hydroxyl group respectievely and N in thiazolyl ring.