Table 2. The IR absorbance spectra of Schiff bases derived from L-tryptophan and their copper complexes.

Valence deviations	Schiff bases	Metallocomplexes
ν (NH), cm -1	3180 – 3190	3250 – 3270
ν (C=N), cm -1	1625 – 1645	1611 – 1625
ν (C=О), cm -1	1583 – 1595
ν (C-N), cm -1	1080 – 1088	1060 – 1080
ν (C-O), cm -1	1103 – 1109	1106 – 1109
ν (C-N), cm -1	1080 – 1088	1060 – 1080
ν (C-C), cm -1	1013 – 1016	1013 – 1020