This article presents the synthesis and physicochemical characterization of a mixed-ligand Co(II) complex with salicylamide and monoethanolamine (MEA) ligands. The complex was synthesized in an alcohol–water medium using a GT SONIC-D3 professional ultrasonic cleaner operating at a frequency of 40 kHz. The obtained product was characterized by Fouriertransform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), while its elemental composition was determined by X-ray fluorescence (XRF) analysis. FTIR results indicated that coordination to the Co(II) ion occurs through the oxygen and nitrogen donor atoms of the ligands. SEM analysis revealed a needle-like crystal morphology of the synthesized complex. XRF analysis confirmed the presence of cobalt in the complex structure. The obtained results demonstrate the formation of a stable mixed-ligand complex in the Co(II)–salicylamide–MEA system.