General procedure for preparation of ligands:
Schiff bases were synthesized by dropwise addition of 1,3-benzenedicarboxaldehyde (1.0 mmol)
in ethanol (5 ml) to the stirring ethanolic solution of thiazole-amines (2.0 mmol). Reaction
mixtures were stirred for 30 min followed by reflux for 7-8 hrs and the progress of reaction was
monitored by TLC. Upon completion of reaction, the solutions were cooled, filtered, washed
thrice with ethanol and air dried.
R
NH
2
H
O
H
O
N
N
R
R
Ethanol
70-75°C, 7-8 h
R = 5-nitro benzothiazole, 5-methyl thiazole
N
N
N
S
N
S
O
2
N
NO
2
N
N
N
S
N
S
H
3
C
CH
3
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