Schiff Base Ligand 3-(-(2-Hydroxyphenylimino) Methyl)-4H-Chromen-4-One as Colorimetric Sensor for Detection of Cu²⁺, Fe³⁺, and V⁵⁺ in Aqueous Solutions

Table 1

Important IR spectroscopic data (cm⁻¹) of the ligands (SL) and their Cu²⁺, Fe³⁺, and V⁵⁺ complexes.

Compounds	Ʋ (H2O)	Ʋ (OH)	Ʋ (C=O)	Ʋ (C=N)	V=O	Ʋ (M-N)	Ʋ (M-O)
SL	—	3197	1639	1562	—	—	—
[Fe(SL)2]. 3H2O	3258	—	1658	1585	—	487	549
[Cu(SL)2]. 2H2O	3197	—	1655	1583	—	487	562
(MH4)3 [VO2SL]	3362	—	1645	1584	911	488	581
					963
K3 [VO2SL]	3400	—	1656	1583	960	489	585