Spectrum 2000 ftir

The conversion of AN was measured by gravimetry. Mn and PDI of PAN were determined by GPC system (Wyatt GPC/SEC-MALS, USA). The column system was calibrated with PSt standards (Mn = 30,000). DMF was used as an eluent at a flow rate of 0.5 mL/min at 50℃. Samples were filtered with a 0.22 µm Organic nylon 66 filter and then were injected manually (syringe volume V = 1ml). FTIR spectroscopy was recorded on a Perkin-Elmer Spectrum 2000 FTIR, the samples was compressed with KBr and measured at room temperature. The spectral range was 4000–450 cm⁻¹ and the resolution was 4 cm^{−1. 1}HNMR spectrum was conducted in DMSO at room temperature on a Bruker AV400 NMR spectrometer. Tetramethylsilane was used as internal standard.

All reactions were routinely carried out under an argon atmosphere, using the standard Schlenk techniques. The solvents were distilled immediately before use under nitrogen from the appropriate drying agents. Chromatographic separation was carried out on columns of dried celite. The glassware was oven-dried before use. The infrared spectra were recorded at 298 K on a PerkinElmer Spectrum 2000 FT-IR (Fourier transform infrared) spectrophotometer (Waltham, MA, USA), the electrospray ionization mass spectrometry (ESI MS) spectra were recorded on a Waters Micromass ZQ 4000 (Milford, MA, USA), with the samples dissolved in CH₃OH. All the deuterated solvents were degassed before use. All NMR measurements were performed on a Mercury Plus 400 instrument (Oxford Instruments, Abingdon-on-Thames, UK). The chemical shifts for ¹H and ¹³C were referenced to internal TMS. All NMR spectra were recorded at 298 K. The decomposition point (dec. point) was measured on a Büchi 535 apparatus (Flawil, Switzerland). All the experimental and calculated yields were referenced to the precursor 1. All the reagents were commercial products (Aldrich, Saint Louis, MI, USA) of the highest purity available and were used as received. The (RuCl₃·xH₂O) was purchased from Strem (Bischheim, France) and used as received. The compound (Ru(H)₂(CO)(PPh₃)₃) (1) was prepared by published methods [17 (link)].

The target compounds were synthesized mainly in four steps (Figure 2). All the reaction processes were monitored by thin-layer chromatography (TLC) using silica gel plates (60 F254), and the target compounds were purified by column chromatography, which was performed on silica gel (60–120 mesh) using distilled hexane and ethyl acetate. ¹H NMR and ¹³C NMR spectra were determined in DMSO-d₆ by using 400 and 100 MHz spectrometers (Instrument Bruke AM-400, 400 MHz), and ESI-Bruker APEXⅡ49e mass spectrometer was applied to record the mass spectra. Perkin-Elmer Spectrum 2000 FTIR was applied to record the infrared spectra. Melting points of the synthesized compounds were measured in open glass capillary tubes with Shengyan electrothermal PIF YRT-3 apparatus without correcting.