SPECTROSCOPIC ANALYSIS OF THE COMPLEX COMPOUND FORMED BY COBALT(II) CHLORIDE WITH THE 2-AMINO-5-CHLOROBENZOXAZOLE LIGAND
This study developed a targeted method for the synthesis of a new coordination compound with the composition [CoL2Cl2] based
on cobalt(II) chloride and the 2-amino-5-chlorobenzoxazole ligand in an ethanolic medium (at a molar ratio of 1:2) (reaction yield
76%, Tm.p. = 115–117 °C. The composition, structure, and physicochemical properties of the synthesized complex were
comprehensively investigated using infrared (IR) spectroscopy, thermal analysis (TGA/DTA), scanning electron microscopy, and
energy-dispersive X-ray spectroscopy (SEM-EDS). According to the results of the IR spectral analysis, the stretching vibration
frequency of the azomethine C=N group was found to shift toward the lower-frequency region compared with the free ligand,
indicating coordination of the ligand to the central Co(II) ion through the endocyclic nitrogen atom. The thermal analysis
(TGA/DTA) data demonstrated the thermal stability of the complex up to 200 °C, as well as the multistage nature of its
decomposition. The SEM-EDS microanalysis results confirmed the homogeneous distribution of all elements (Co, Cl, C, N, O) in
the sample and indicated that the investigated sample represents a new coordination compound rather than a mechanical mixture
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