Vector 22 infrared spectrometer

All starting materials were purchased from Sigma-Aldrich and Merck companies and used without additional purification. Reactions were monitored by aluminum TLC plate, silica gel coated with fluorescent indicator F₂₅₄. Melting points were measured using a Buchi B-545 apparatus through the capillary tube method and reported without any correction. IR spectra were recorded from KBr disks using FT-IR Bruker Vector-22 infrared spectrometer in the range of 400–4000 cm⁻¹. The ¹H NMR and ¹³C NMR were run on an FT-NMR Bruker UltraShield™ (500 MHz) in DMSO-d₆ and CDCl₃ as a solvent and the chemical shifts are expressed as δ units with tetramethylsilane (TMS) as internal standard. Mass spectra were obtained on an Agilent Technologies apparatus at ionization potential of 70 eV. The concentration of copper in the prepared catalysts was determined using inductively coupled plasma optical emission spectroscopy by SPECTRO ARCOS ICP-OES spectrometer.

All the chemicals utilized in this study were procured from commercially available sources and used without requiring additional modifications. Solvents were distilled before use. Fourier transform infrared (FT-IR) spectra were obtained using a Bruker Vector-22 infrared spectrometer with KBr pellets. Melting points were measured using a Buchi 535 melting point apparatus. The SEM and EDX analyses were performed using a TESCAN Vega Model scanning electron microscope. XRD patterns were obtained using a X'pert Pro model from Panalytical (Holland). TGA experiments were conducted using a TGA 209F1 thermoanalyzer instrument from Netzsch, (Germany). TEM of the samples were determined using a Zeiss EM10C Transmission Electron Microscope (Germany). NMR spectra were recorded Bruker Avance III HD spectrometer on a 500 or 300 MHz spectrometer for the ¹H nucleus, and a 125.7 or 75 MHz spectrometer for the ¹³C nucleus, using CDCl₃ or DMSO-d₆ as solvent.

Melting points were determined with a Buchi B-545 apparatus. Proton nuclear magnetic resonance (¹H NMR) spectra were recorded on a Bruker-ARX500 spectrometer. Fourier transform infrared (FTIR) spectrum was recorded on a Bruker, Vector 22 infrared spectrometer. The morphology of the polymers, after the surfaces were coated with gold, was investigated by scanning electron microscopy (SEM) (TESCAN, Vega3); X-ray diffraction (XRD) studies were performed on a Bruker, D8 advance XRD instrument. Inductively coupled plasma adsorptions were recorded on a Spectro Arcos inductively coupled plasma-optical emission spectrometry spectrometer.