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FT-IR spectra were obtained in a Perkin Elmer spectrophotometer (model Spectrum 100) with a resolution of 4 cm−1, operating in the range of 4000–600 cm−1 and with attenuated reflectance (ATR) Fourier transform.UV–Vis spectra were obtained on a Perkin Elmer spectrophotometer (model Lambda 25), operating in the range of 900–190 nm.TG- DSC was performed in a Mettler Toledo, model TG/DSC-1, using an α-Al2O3 crucible (70 μL) with a sample mass of approximately 7 mg, heating rate 20 °C min−1, dry air flow of 60 mL/min and a temperature range of 30–1000 °C.
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