Fig. 5: Solid-state DD/MAS/13C NMR spectra of RF-NH3-523 and RF-(COOH)2-523 resins. | Communications Chemistry

Fig. 5: Solid-state DD/MAS/13C NMR spectra of RF-NH3-523 and RF-(COOH)2-523 resins.

From: Solar-to-hydrogen peroxide energy conversion on resorcinol–formaldehyde resin photocatalysts prepared by acid-catalysed polycondensation

Fig. 5

Assignments of carbon components: aldehyde –CHO (210 ppm: a), ketone C=O (190 ppm: b), quinone C=O (182 ppm: c), resorcinol C–OH (153 ppm: d), nonsubstituted resorcinol C at meta position (130 ppm: e), methine linker –C═ (126 ppm: f), substituted resorcinol C (117 ppm: g), nonsubstituted resorcinol C at para and ortho positions (110 ppm: h, 105 ppm: i), methylene ether linker –C–O–C– (70 ppm: j), methylol C–OH (55 ppm: k), methylene linker –C– substituted to 4,4ʹ-, 2,4ʹ-, and 2,2ʹ-positions of resorcinol (30 ppm: l, 20 ppm: m, 10 ppm: n), and methyl –CH3 (5 ppm: o).

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