The extraction of Pd²⁺ with N,N-dialkyl-2-(3-(pyridine-2-yl)-1H-pyrazole-1-yl) acetamide (A-C-PzPy) and N,N-dialkyl-3-(pyridine-2-yl)-1H-pyrazole-1-carboxamide (A-PzPy) from HNO₃ medium, as well as the complexation of Pd²⁺ with A-C-PzPy were investigated. The use of tert-butyl benzene (TBB) as a diluent for A-C-PzPy offered significantly better extractability toward Pd²⁺, compared to that of A-PzPy. This study demonstrated strong extractability, high selectivity, high loading capacity, and fast extraction kinetics for DOct-C-PzPy toward Pd²⁺ from highly acidic HNO₃ solution (up to 5.0 mol/L). Slope analysis showed the formation of 1:1 type of extracted species of Pd²⁺ with DOct-C-PzPy ligand. The extraction was a spontaneous and endothermic process with increased entropy. The analyses of electrospray ionization mass spectrometry (ESI-MS), Fourier transform infrared (FT-IR) and UV–vis spectrophotometric titration revealed that the composition of the extracted neutral complex species was Pd(NO₃)₂(DOct-C-PzPy). Combining the results of solvent extraction and complexation study, a neutral complexation extraction model is proposed. Furthermore, the stability constants (log β) for the complexation of Pd²⁺ with A-C-PzPy are also presented.

用N,N-二烷基-2-(3-(吡啶-2-基)-1 H-吡唑-1-基)乙酰胺 (AC-PzPy) 和N,N-二烷基-3-萃取 Pd ²⁺ (pyridine-2-yl)-1 H -pyrazole-1-carboxamide (A-PzPy) 来自 HNO ₃介质，以及 Pd ²⁺与 AC-PzPy 的络合。与 A-PzPy 相比，使用叔丁基苯 (TBB) 作为 AC-PzPy 的稀释剂可显着提高对 Pd ^{2+的萃取性。}本研究证明了 DOct-C-PzPy从强酸性 HNO _{3中对 Pd} ^{2+的强萃取性、高选择性、高负载能力和快速萃取动力学}溶液（最高 5.0 mol/L）。斜率分析表明与DOct-C-PzPy配体形成1:1类型的Pd ^{2+提取物。}萃取是一个自发的吸热过程，熵增加。电喷雾电离质谱（ESI-MS）、傅里叶变换红外（FT-IR）和紫外-可见分光光度滴定分析表明，提取的中性络合物组分为Pd(NO ₃ ) ₂ (DOct-C-PzPy ）。结合溶剂萃取和络合研究的结果，提出了中性络合萃取模型。此外，还给出了 Pd ²⁺与 AC-PzPy 络合的稳定性常数 (log β )。