Abstract

We investigated the complexation reaction of N-benzoyl-N'-(phenylsulfonyl)hydrazine with Cu(II) ions in an ammonia medium. The absorption spectra of the reagent and its complex compound with Cu(II) ions were recorded and analyzed. Optimal conditions for complex formation were determined, including the pH range for complexation, the optimal time for color development, and the amount of photometric reagent. Under optimal conditions, a calibration curve for the complexation of BFSH with Cu(II) ions was plotted. The Beer–Lambert–Bouguer law is valid in the range from 0.5 to 1.75 mg of Cu(II) in 25 mL of the solution. The true (19 389 cm²/mol) and apparent (4708 cm²/mol) molar absorption coefficients were calculated. Using the methods of saturation, equilibrium shift, curve intersection, isomolar series, and conductometric titration, the molar ratios in the solution of the complex compound were determined as [Cu(II)] : [BFSH] = 1 : 1 and 1 : 2. The conditional stability constant of the complex, calculated using the Babko method, is 2.45 × 10¹³. The convergence and accuracy of the spectrophotometric method were determined statistically.

中文翻译：

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氨介质中 Cu(II) 离子与 N-苯甲酰基-N'-(苯磺酰基)肼反应的分光光度研究

摘要

我们研究了N-苯甲酰基-N '-(苯磺酰基)肼与 Cu(II) 离子在氨介质中的络合反应。记录并分析了该试剂及其与Cu(II)离子的络合物的吸收光谱。确定了络合形成的最佳条件，包括络合的pH范围、显色的最佳时间和光度试剂的量。在最佳条件下，绘制了 BFSH 与 Cu(II) 离子络合的校准曲线。比尔-朗伯-布格定律适用于 25 mL 溶液中 0.5 至 1.75 mg Cu(II) 的范围。计算了真摩尔吸收系数（19 389 cm ² /mol）和表观摩尔吸收系数（4708 cm ^{2 /mol）。}采用饱和法、平衡移法、曲线相交法、等摩尔级数法、电导滴定法等方法，确定络合物溶液中的摩尔比为[Cu(II)]:[BFSH]=1:1和1:2使用Babko方法计算该配合物的条件稳定常数为2.45×10 ¹³。统计确定分光光度法的收敛性和准确性。