“…The main vibrational modes are summarized in Table 4, as well as the tentative assignment based on similar chemical systems. [31][32][33][34] In the infrared spectrum of the aminosalicylate anion can be observed a broad band around 3200-3500 cm À1 region, assigned to the stretching modes of H 2 O and NH 2 groups. These same bands are also observed for the three complexes, suggesting the hydration of all synthesized compounds, previously confirmed by the data from elemental analysis and X-ray diffraction.…”