Table 2. Significant IR Bands for the Ligands and Their Mixed-Ligand Complexes^a.

compound	υ(CN)	υ(NH)	υ(C=O)1	υ(C=O)2	υ(C=O)*	υ(C=N)	δ(NH)	υas(OAc); υs(OAc)	υ(M–O)	υ(M–N)
(1) H2L1	2250	3270	1620	1620
		3209
(2) HL2	2222	3329			1676	1521
(3) [Cr(OAc) (H2L1)(HL2)]·2(OAc)	2250	3399	1620	1610	1670	1547	1457	1457	575	520
		3150						1373
(4) [Mn(H2L1)(HL2)]·Cl2·2H2O	2250	B. C. at 3448	1642	Sh, 1600	1681	1563	1412		643	525

^aB. C. Board centered for υ(OH) of water + υ(NH); Sh Shoulder.