Kinetics and mechanism of chelation of nickel(II) by a tridentate .alpha.-[(2-hydroxyphenyl)azo]-.alpha.-acetoacetonitrile and an .alpha.-(8-quinolylazo)-.alpha.-acetoacetonitrile dye

Abstract

Kinetics and Mechanism of Chelation of Nickel(II) by a Tridentate a-[(2-Hydroxyphenyl)azo]-a-acetoacetonitrile and an a-(8-Quinolylazo)-a-acetoacetonitrile Dye

Kinetics and mechanisms of the complexation of aqueous lanthanide ions by 4-(2-pyridylazo)resorcinol †

“…Similar evidence for a specific dye-buffer interaction between piperazine buffer and a cyano keto azo dye ligand has been observed. 60 In the linear plot (Fig. 5) for the Tris buffer k 1 decreases with increasing Tris buffer concentration.…”

“…However, some kinetics of the complexation of transition metal ions by PAR and PAN has been reported. [53][54][55][56][57][58][59][60][61][62][63][64][65][66] Differences between transition metal ions and lanthanide or actinide ions make it interesting to study the complexation kinetics of lanthanide ions and uranium() with PAR and PAN.…”

Kinetic analysis of the complexation of aqueous lanthanide(III) ions by arsenazo III †

“…Meyers et al 54 observed a very similar Raman result when they studied the chelation of nickel() by tridentate α-(2hydrozyphenylazo)acetoacetonitrile and an α-(8-quinolylazo)acetonitrile dye. They noted that the phenolic OH was ionized at pH 13, the aryl-O stretching vibration appeared at 1246 cm Ϫ1 , and this vibration was shifted to 1250 cm Ϫ1 upon complexing at all pH values.…”

“…Intense bands at 1221, 1437 and 1480 cm Ϫ1 were observed. The last two bands have higher frequencies than those of the uncomplexed azo bands, 54 which indicates a higher N᎐ ᎐ N bond order in the complex.…”

Synthesis, spectroscopic characterization, crystal structure and theoretical investigation of two azo-palladium (II) complexes derived from substituted (1-phenylazo)-2-naphtol

“…There is a great coordination affinity of the metals towards chromophoric ligands, leading to the formation of transition metal complexes evidenced by an absorption displacement of their UV-Vis spectra and accompanied by an enhancement of the dye fastness [11][12][13]. Various properties such as structures, chelate formation constants, and stability have been reported [14].…”