Compound
-OH
-C6H4
Scheme 1 A
12.02
6.53 – 7.24
(I)
12.12
6.33 – 7.44
(II)
11.92
6.30 – 7.46
Table 7:
1H NMR data of ligand* and its complexes
a
.
a
The serial number corresponds to that used in Table 5. *No signals even weak, of the open ring tautomer (Scheme 1B) can be detected. Note: NH proton signal is observed at 4.18 ppm (Scheme 1A).
