Spectrophotometric Investigation of the Reaction of Cu(II) Ions with N-Benzoyl-N'-(phenylsulphonyl)hydrazine in Ammonia Media

Reviews and Advances in Chemistry Pub Date : 2024-02-28 DOI:10.1134/s2634827623600160

Yu. B. Elchishcheva, A. S. Sorokina, P. T. Pavlov

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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.

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

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。记录并分析了试剂及其与 Cu(II) 离子的络合物的吸收光谱。确定了络合物形成的最佳条件，包括络合的 pH 值范围、显色的最佳时间以及光度测定试剂的用量。在最佳条件下，绘制出了 BFSH 与 Cu(II) 离子络合的校准曲线。比尔-朗伯-布格尔定律在 25 毫升溶液中含 0.5 至 1.75 毫克 Cu（II）的范围内有效。计算了真实摩尔吸收系数（19 389 cm2/mol）和表观摩尔吸收系数（4708 cm2/mol）。利用饱和、平衡移动、曲线相交、等摩尔数列和电导滴定等方法，确定了复合物溶液中的摩尔比为 [Cu(II)] : [BFSH] = 1 : 1 和 1 : 2。用巴布科方法计算出的该复合物的条件稳定常数为 2.45 × 1013。分光光度法的收敛性和准确性是通过统计学方法确定的。

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Reviews and Advances in Chemistry

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