A new pyrazole derivatives azo dye 1-(3-phenyl-5-Pyrazolylazo)-R acid (L₁) and 5-(3-phenyl-5-Pyrazolylazo)-8-hydroxy quinoline (L₂) was synthesized. The acid–base equilibrium, ionization constants, the effect of pH and some organic solvents on the spectra of ligands, the chromogenic reaction and the stability constant of Co⁺², Cu⁺²,Ni⁺² and Zn⁺² ion complexes with ligands were studied and determined spectrophotometrically and conductometrically. The optimum pH was determined for the ligands and the complexes. 2:1 and 1:1 (L:M) stoichiometric complexes have been formed in solutions. The stability constants order of the under study complexes was Co⁺² < Ni⁺² < Cu⁺². These metal ions were determined using the ligands as indicators. The reagents can be also useful to use as indicators in acid–base titrations as confirmed experimentally.

合成了新型吡唑衍生物偶氮染料1-(3-苯基-5-吡唑基偶氮)-R酸(L ₁ )和5-(3-苯基-5-吡唑基偶氮)-8-羟基喹啉(L ₂ )。酸碱平衡、电离常数、pH值和一些有机溶剂对配体光谱的影响、Co ⁺²、Cu ⁺²、Ni ⁺²和Zn ⁺²离子与配体配合物的显色反应和稳定常数通过分光光度法和电导法研究和测定。确定了配体和配合物的最佳 pH 值。2:1 和 1:1 (L:M) 化学计量配合物已在溶液中形成。所研究配合物的稳定常数顺序为 Co ⁺²  < Ni⁺²  < 铜⁺²。使用配体作为指示剂测定这些金属离子。经实验证实，这些试剂还可用作酸碱滴定中的指示剂。