Abstract <p>Ionic liquids (ILs) based on tetrahexyl-, tetraheptyl-, and tetraoctylammonium cations and dicyanamide anions have been synthesized by reacting ammonium bromides with dicyanamide salts. The purity of the ILs (&gt;98%) has been ascertained by atomic absorption spectroscopy and ion chromatography. We have assessed the influence of solution acidity, extraction temperature and duration, and the volume ratio of the aqueous and organic phases on platinum ion extraction and optimized extraction conditions. The ionic liquids having longer alkyl chains have been shown to be more effective in extracting platinum complexes from an aqueous phase owing to their more pronounced hydrophobic properties. Spectroscopic analysis of the extraction systems has shown that the mechanism of platinum extraction is related to the formation of stable ion pairs between a metal halide complex and tetraalkylammonium cations. This interaction leads to a hypsochromic shift in the absorption spectra of the complexes (λ_max = 261 nm), confirming the nature of the compounds formed. The ILs studied here have good stability and low solubility in the aqueous phase, which makes them reliable extractants. The proposed method can be useful in recycling secondary platinum sources, purifying industrial wastewater, and minimizing environmental pollution.</p>