In the IR spectrum of the polymer film, the absorption peaks at 1772 and 1187 cmÀ1 assignable to the C=O and C–O–C stretch- ing from aryl ester linkage disappeared, and shows new appearance of characteristic absorption peaks at 1742 and 1237 cmÀ1 assignable to the C=O and C– ...
A spectrum of the liquid phase has been recorded and compared to that of the amorphous ether to check for possible procedural artifacts. To facilitate cross-laboratory comparisons, estimates are made for absorption coefficients of three IR peaks of the amorphous solid's spectrum. An interpretation ...
As shown in Figure 1, peaks ascribed to the termi- nal groups of the polymer-1 are not observed in the 1H NMR spectrum. However, the molecular weights of the polymer determined by the GPC measurement were not high (Mn ¼ 1760 and Mw ¼ 6320). The somewhat low molecular weights of...
2. In the FT−IR spectrum of PEUP (Fig. 2d), a prominent absorption peak at 2307 cm−1 corresponding to the characteristic absorption of−NCO groups was observed (Fig. 2a). The disappearance of absorption peaks relating to −OH groups in Conclusions In this study, we engineered a...
Figure 2 shows the FT-IR spectra of PNR and RS. As shown in Figure 2 (RS), the wide absorption band at 3,400 cm–1 corresponding to the hydroxyl was observed and the bending vibration band of the methylol group at 1,080 cm−1 was obvious. Compared to the spectrum of RS, th...
The cross peaks in the COSY spectrum along both the sides of the diagonal identify two groups of correlated protons. One group is between the protons at δ7.89 ppm andδ7.12 ppm, corresponding to the protons ortho to fluorine and carbonyl, respectively. The other is between δ7.76 ppm and ...
It is worthy to underline that the spectrum of dry POEGMA_950 significantly differs from the spectra of others investigated POEGMAs. It is due to the semi-crystalline character of this sample resulting in higher coherence of individual modes and better separation of fundamental peaks. According to...
A 900-MHz 1D 1H NMR spectrum is shown above the 2D spectra. There are clear correlations between the Se atom and b protons on either side of the selenium bridge, confirming its position. (b) Ensemble of 10 NMR-derived solution structures for 14 (green), the inactive SeLan 16 (orange)...
The IR spectrum of this material showed strong, broad peaks at 3350 and 1170 cm-1attributed to the free acid groups.13C NMR in dilute base showed a greatly reduced peak for the ester methyl carbon, and two peaks for the carbonyl groups corresponding to hydrolyzed and unhydrolyzed ester units...
A baseline and ATR correction were applied to the spectrum using Nicolet Omnic® software. The spectrum was imported to G/AI 8.0 Spectroscopy software. In G, a Fourier deconvolution algorithm was applied using a gamma of 6. The peaks of interest were integrated within G. The peak height ...