Ftir 6200 spectrophotometer

The IR spectra of the coordination compounds were recorded on the Jasco FT/IR 6200 spectrophotometer (JASCO, Easton, MD, USA), in the spectral range 4000–400 cm⁻¹, in a form of KBr pellets. The UV-Vis diffuse reflectance spectra were recorded on the Jasco V-660 spectrophotometer (JASCO, Easton, MD, USA), in the spectral range 190–800 nm, using BaSO₄ as a standard with 100% reflectance. The thermal analyses were carried out in the TG/DTA-SETSYS-16/18 thermoanalyser (SETARAM Instrumentation, Caluire, France) coupled with the ThermoStar (Balzers) mass spectrometer. Samples were heated in platinum crucibles up to 1000 °C, with heating rate 5 °C∙min⁻¹ in synthetic air (21.0% O₂, 79.0% N₂) flow. Final products of decomposition were confirmed by X-ray powder diffraction (XRPD) using the Powder Diffraction File [44 ]. The X-ray powder diffraction (XRPD) patterns were measured in reflection mode on the XPert PRO XRPD system (Malvern Panalytical Ltd., Royston, UK) equipped with CuKα1 radiation, Bragg–Brentano PW 3050/65 high-resolution goniometer and PW 3011/20 proportional point detector. Surface morphologies of cobalt(II) oxide nanoparticles were characterized by the scanning electron microscope with energy dispersive X-ray spectrometer (SEM-EDS, HITACHI S-4700, EDS Thermo NORAN).

The elemental analysis of C, H, and O was carried out using a Vario EL III CHNOS Elemental Analyzer (Elementar, Langenselbold, Germany). The Cu content was determined based on edta titration in the presence of 1-(2-pyridylazo)-2-naphtol as an indicator [32 ]. Analysis for the studied compound [determined/theoretical (%)]: C 48.9/49.8; H 6.0/6.1; O 27.1/26.5; Cu 16.9/17.6. The FT-IR spectra were recorded on a Jasco FT/IR 6200 spectrophotometer (JASCO, Easton, MD, USA), in the form of KBr pellets, in the spectral range 4000–400 cm⁻¹, with resolution 1 cm⁻¹. The thermal decompositions were carried out with a Netzsch STA 449 F1 Jupiter thermoanalyzer (Netzsch-Geratebau GmbH, Selb, Germany) coupled with a Netzsch Aeolos Quadro QMS 403 mass spectrometer (Netzsch-Geratebau GmbH, Selb, Germany). Samples were heated in Al₂O₃ crucibles, in the temperature range 35–1000 °C, with the heating rate 10 °C/min in synthetic air (80% N₂, 20% O₂).

The FT-IR spectra were recorded on the Jasco FT/IR 6200 spectrophotometer (JASCO, Easton, MD, USA), in the form of KBr pellets, in the spectral range 4000–400 cm⁻¹. The UV-Vis diffuse reflectance spectra were recorded on a Jasco V-660 spectrometer (Jasco, Easton, MD, USA), in the spectral range 190–800 nm, using spectralon [44 (link)] as a standard with 100% reflectance. The thermal decompositions were carried out with the Netzsch STA 449 F1 Jupiter thermoanalyzer (Netzsch-Geratebau GmbH, Selb, Germany) coupled with the Netzsch Aeolos Quadro QMS 403 mass spectrometer (Netzsch-Geratebau GmbH, Selb, Germany). Samples were heated in corundum crucibles, in the temperature range 35–1000 °C, with the heating rate of 10 °C/min in synthetic air (80% N₂, 20% O₂). The XRPD patterns were recorded in a reflection mode on the XPert PRO MPD diffractometer (Malvern Panalytical Ltd., Royston, UK) equipped with CuKα1 radiation, a Bragg–Brentano PW 3050/65 high-resolution goniometer, and PW 3011/20 proportional point detector.