Characterization of Complexes Synthesized Using Schiff Base Ligands and Their Screening for Toxicity Two Fungal and One Bacterial Species on Rice Pathogens

Table 12

Characteristic IR data for the ligand DHA (bidentate –O, –O) and its participation in complex formation with metal ions.

S. number	Complex	IR cm^−1 (s = sharp; b = broad; d = doublet; w = weak; vw = very weak)
		Coord water	vO–H	vC=O (lactone)	vC=O	vC–O phenolic	M–O
1	DHA-L6^b	—	3030 (s)^a	1710 (s)	1655 (s)	1265 (s)	—
2	[Cr(DHA)3]	—	Absent^c	1740 (s)	1635 (s)	1280 (s)	480, 440
3	[VO(DHA)2(H2O)]	3500–3400 (b)	Absent^c	1740 (s)	1640 (s)	1290 (s)	910 (V=O)^d, 850, 480, 440

Intramolecular hydrogen bonded; ^bNo shift in vC–O–C indicates noninvolvement in complex formation, Mahesh and Gupta [103]; ^cCleavage of hydrogen bonding due to complexation, ^dSelbin [94].