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. 2022 Jan 5;27(1):325. doi: 10.3390/molecules27010325

Table 3.

Characteristic 1H NMR signals for copolyesters (see Figure 4 for reference to Label letters).

Label Chemical Shift [ppm] Group
a 7.77–7.80 TH-H
b 7.55–7.62 Ar-H
c 3.81–3.88 -O-CH3
d, e 4.30–4.43 TH-O-CH2-CH2-O-Ar
f 1.79 -O-CH2-CH2
g 1.45 -O-CH2-CH2-CH2-

TH = Thiophene ring; Ar = Phenyl ring.