Complexes of Cobalt(II) with 2-Methoxy-N-{(1S)-1-phenyl-2-[(prop-2-en(in)-1-yl)oxy]ethyl}aniline and Their Applications

The reaction of cobalt(II) with two ligands was studied by the extraction-photometric method. (S)-N-[2-(Allyloxy)-1-phenylethyl]-2-methoxyaniline and (S)-2-methoxy-N-[1-phenyl-2-(prop-2-yn-1-yloxy)ethyl]aniline were used as ligands. CoL₂ complexes are electrically neutral. A single extraction with chloroform yielded 98.2–99.5% Co(II). Phase volume ratios of 5 : 5–115 : 5 did not affect the recovery. The yield of CoL₂ was maximum at C_L = 0.008M and did not decompose for 24 hours or more than 30 days after extraction. The optimal acidity was at pH_opt = 3.3–6.5 (pH_form = 1.1–8.8). Compliance with the fundamental law of light absorption is achieved at C_Co(II) = 0.16–20 μg/mL. The ratio of components in the complex is 1 : 2, the coordinating ion is Co²⁺. The following do not interfere with the determination of Co(II): Li⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺, Ba²⁺, La³⁺, Ce³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Eu³⁺, Gd³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Er³⁺, Tm³⁺, Yb³⁺ and Lu³⁺. The developed extraction-photometric method was applied to determine cobalt in wheat, oats and peas.