S. No.

Schiff bases

NMR Spectral data (Experimental)

¹H

¹³C

1.

SA

6.9 - 7.6 m, aromatic protons, 9.0 s -CH=N-, 13.8 s ph-OH

120.0 - 160.6 ppm phenyl Carbons, 18.9 ppm -CH=N carbon

2.

AA

6.6 - 7.3 m, aromatic protons, 9.0 s ph-OH, 3.5 s -CH₃ protons

160 - 180.6 ppm phenyl Carbons, 19.0 ppm -C-CH₃

3.

VA

6.8 - 7.4 m, aromatic protons, 9.0 s -CH=N-, 14.1 s ph-OH, 3.8 s -OCH₃ protons

146 - 178.0 ppm phenyl Carbons, 19.5 ppm -CH=N- and -OCH₃

4.

NA

6.8 - 8.4 m, aromatic protons, 9.5 s -CH=N-, 15.8 s ph-OH

160-180.6 ppm phenyl and naphtyl Carbons, 19.6 ppm -CH=N-carbon