Abstract

Complexation between silver(I) ions and N-phenylthiourea is studied over a wide range of silver(I) and N-phenylthiourea (L) concentrations at 25.0°C and ionic strength I = 0.11 M (0.01 M HNO₃ + 0.1 M NaNO₃) by potentiometric titration using a silver electrode. Mono- and binuclear complexes are present in the studied concentration range of Ag⁺ ions (1 × 10^–5–1 × 10^–3 mol/L). \({\text{A}}{{{\text{g}}}_{{\text{2}}}}{\text{L}}_{3}^{{2 + }}\) is the dominant species. At C_L/C_Ag > 1, the content of mononuclear species is much lower than that of binuclear ones. The calculated overall stability constants of the complexes are as follows: log β₁₁ = 5.58, log β₁₂ = 10.75, log β₂₁ = 10.1, log β₂₂ = 17.1, log β₂₃ = 23.2, log β₂₄ = 25.9, and log β₂₅ = 29.2.

中文翻译：

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银（I）离子与N-苯基硫脲在水溶液中的络合平衡

摘要

在25.0°C和离子强度I = 0.11 M（0.01 M HNO ₃ + 0.1 M NaNO ）的广泛浓度的银（I）和N-苯基硫脲（L）上研究了银离子与N-苯基硫脲之间的络合作用₃）通过使用银电极的电位滴定法。在研究的Ag ⁺离子浓度范围（1×10 ^–5 –1 – 10×10 ^–3 mol / L）中存在单核和双核络合物。\（{\ text {A}} {{{\ text {g}}} _ {{\ text {2}}}} {\ text {L}} _ {3} ^ {{2 +}} \）是优势种。在C _L / C _Ag> 1，单核物种的含量远低于双核物种。复合物所计算出的总稳定常数如下：日志β ₁₁ = 5.58，对数β ₁₂ = 10.75，登录β ₂₁ = 10.1，登录β ₂₂  = 17.1，登录β ₂₃ = 23.2，登录β ₂₄ = 25.9，和日志β ₂₅ = 29.2。