Table 3.

¹H-NMR spectral data for Schiff bases 1–3.

Schiff Base	1H-NMR (400 MHz: DMSO-d6, δ, ppm, J in Hz)
1	9.17 (s, exch., 4 H, OH), 9.08 (s, 4 H, CH), 7.93 (s, 2 H, Ar), 7.71 (d, J = 8.2 Hz, 4 H, Ar), 7.64 (d, J = 8.5 Hz, 2 H, Ar), 7.44 (t, J = 8.2 Hz, 4 H, Ar), 7.25 (d, J = 8.5 Hz, 2 H, Ar), 7.00 (t, J = 8.2 Hz, 4 H, Ar), 6.99 (d, J = 8.2 Hz, 4 H, Ar)
2	8.08 (s, exch., 4 H, OH), 8.01 (s, 4 H, CH), 7.63 (s, 2 H, Ar), 7.53 (d, J = 8.1 Hz, 4 H, Ar), 7.48 (d, J = 8.5 Hz, 2 H, Ar), 7.48 (s, 4 H, Ar), 7.35 (d, J = 8.5 Hz, 2 H, Ar), 7.18 (t, J = 8.1 Hz, 4 H, Ar), 6.95 (d, J = 8.1 Hz, 4 H, Ar)
3	8.61 (s, 4 H, CH), 8.32 (d, J = 8.3 Hz, 8 H, Ar), 8.05 (d, J = 8.3 Hz, 8 H, Ar), 7.70 (s, 2 H, Ar), 7.50 (d, J = 8.4 Hz, 2 H, Ar), 7.35 (d, J = 8.4 Hz, 2 H, Ar)