Table 2.

Significant IR spectral bands (cm⁻¹) of perimidine compounds and their VO(II) complexes.

Compounds	ν NH, ν OH	δ NH	υ C=O	ν C=N	ν as(SO4)	ν s(SO4)	δr(H2O), δw(H2O)	ν V=O	ν M-O	ν M-N
(1) (C25H18N4O) (L1)	3155	1473	1618	1518	—	—	—	—	—	—
(2) [(VO)2 (SO4)2 (L1)]H2O	3110, 3350	1470	1596	1514	1420	1142	765, 670	966	588	476
(3) (C26H20N4O2) (L2)	3177	1470	1597	1508	—-	—	—	—	—	—
(4) [(VO)2 (SO4)2 (L2)]2H2O	3100, 3372	1447	1592	1502	1411	1146	765, 697	1074	572	515
(5) (C25H17N5O3) (L3)	3150	1473	1620	1538	—	—	—	—	—	—
(6) [(VO)2 (SO4)2 (L3)]H2O	3105, 3382	1447	1616	1517	1411	1179	743, 697	966	600	508
(7) (C25H17N4OCl) (L4)	3160	1474	1614	1518	—	—	—	—	—	—
(8) [(VO)2 (SO4)2 (L4)]H2O	3100, 3420	1471	1624	1510	1434	1150	755, 637	985	610	550
(9) (C25H17N4OCl) (L5)	3150	1473	1620	1518	—	—	—	—	—	—
(10) [(VO)2 (SO4)2 (L5)]3H2O	3054, 3384	1446	1616	1512	1368	1140	754, 689	1074	589	508