4100 fourier transform infrared spectrometer

FT-IR spectra were measured on a Jasco-4100 Fourier Transform Infrared Spectrometer (JASCO Co., Ltd. Shanghai, China) with KBr disks. The elemental analyses (C, H, and N) were performed on a Vario Micro Elemental Analyzer (Elementar, Germany). The UV–Vis absorbance was measured with a T6 New Century UV spectrometer (P General Co., Ltd., Beijing, China). ¹³C Nuclear Magnetic Resonance (¹³C NMR) spectra were measured with a Bruker AVANCE III Spectroscopy (Bruker Tech. and Serv. Co., Ltd. Beijing, China) The degrees of substitution (DS) were calculated on the basis of the percentages of carbon and nitrogen.

FT-IR spectra were measured on a Jasco-4100 Fourier Transform Infrared Spectrometer (JASCO Co., Ltd., Shanghai, China) with KBr disks. The elemental analyses (C, H, S, and N) were performed on a Vario Micro Elemental Analyzer (Elementar, Berlin, Germany). The degrees of substitution (DS) were calculated on the basis of the percentages of carbon and nitrogen. The UV-Vis absorbance was measured with a T6 New Century UV spectrometer (P General Co., Ltd., Beijing, China). ¹³C CP/MAS NMR experiments were performed on Bruker AVANCE III 600 spectrometer (Bruker Tech. and Serv. Co., Ltd., Beijing, China) at a resonance frequency of 150.9 MHz. ¹³C CP/MAS NMR spectra were recorded using a 4 mm MAS probe and a spinning rate of 12 kHz. The X-ray diffraction patterns of samples were recorded at room temperature on an X-ray diffractometer (D8 advance, Bruker, Berlin, Germany). The morphology of the samples was examined through a Scanning electron microscope (SEM) (S-4800, Hitachi, Tokyo, Japan). Each sample was coated with gold in an ion sputter (E-1045, Hitachi, Tokyo, Japan) before being scanned and photographed at the magnifications (1000×). An accelerating potential of 3 kV was used during image acquisition.

A Jasco-4100 Fourier transform infrared spectrometer (Japan, provided by JASCO Co., Ltd., Shanghai, China), in the range of 4000–400 cm⁻¹ with resolution of 4.0 cm⁻¹ and at 25 °C in the transmittance mode was used to record all Fourier transform infrared (FTIR) spectra. All samples (about 1 mg) were mixed and grinded with KBr (about 100 mg) fully, and then the ground samples were pressed into pills with a compressor for testing. Meanwhile, all spectra were scanned against a blank KBr pellet background.
The compounds, using 99.9% Deuterium Oxide (D₂O) as the solvent, were characterized by a nuclear magnetic resonance (NMR) and the ¹H NMR spectra were analyzed with a Bruker AVIII-500 spectrometer (500 MHz, Switzerland, purchased from Bruker Tech. and Serv. Co., Ltd., Beijing, China).
Trace and ultra-trace elements were detectable by inductively coupled plasma mass spectrometer (ICP-MS) and sodium ions (Na⁺) in samples were determined and analyzed using an Elan DRC II ICP–mass spectrometer instrument (America, supplied by PerkinElmer Co., Ltd., Beijing, China) with a dynamic reaction cell (DRC) technology.