Table 2.

FT-IR spectral bands of the ligand and its complexes of Zr(IV), V(IV), Ru(III), and Cd(II) in 4000–400 cm⁻¹.

Compound	ν (OH/H2O)	ν (N–H)	ν (C = O)side	ν (C = O)ring	ν (C = N)	ν (M-O)	ν (M-N)
C15H15N3O4	3392	3202	1677	1639	1604	—	—
C15H17Cl2N3O8Zr2	3434	2625	1692	1644	1595	621	553
C30H34N6O20S2V2	3433	2925	1689	1650	1553	605	560
C30H29Cl2N6O8Ru	3399	3100	1691	1644	1582	571	506
C15H15CdN5O10	3422,3327	3234,3104	1669	1638	1603	587	455