Advances in Chemistry / 2014 / Article / Tab 1

Research Article

Synthesis and Characterization of Novel Processable and Flexible Polyimides Containing 3,6-Di(4-carboxyphenyl)pyromellitic Dianhydride

Table 1

FTIR, 1H NMR of polyimides (PI-1–PI-6).

CompoundIR (KBr)/cm−1 1H NMR (DMSO-d6, , ppm)
(s; singlet, m; multiplet)

PI-11725, (CO)sym, 1788 (CO)asym
1665 (C=N)
13.01 (s, 2H, COOH)
6.78–7.90 (m, aromatic protons);
8.65 (s, 1H, azomethine)

PI-21718, (CO)sym, 1772 (CO)asym
1650 (C=N)
13.21 (s, 2H, COOH);
6.65–7.89 (m, aromatic protons);
8.15 (s, 1H, azomethine)

PI-31725, (CO)sym, 1778 (CO)asym
1664 (C=N)
13.12 (s, 2H, COOH)
6.41–7.90 (m, aromatic protons);
8.52 (s, 1H, azomethine)

PI-41715 (CO)sym, 1782 (CO)asym
1657 (C=N)
12.98 (s, 2H, COOH)
6.75–7.97 (m, aromatic protons);
8.15 (s, 1H, azomethine)

PI-51725 (CO)sym, 1775 (CO)asym
1665 (C=N)
12.99 (s, 2H, COOH)
6.45–7.78 (m, aromatic protons);
8.62 (s, 1H, azomethine);

PI-61717 (CO)sym, 1780 (CO)asym
1638 (C=N)
13.08 (s, 2H, COOH)
6.35–7.88 (m, aromatic protons);
8.25 (s, 1H, azomethine)

In DMSO-d6 at 295 K.