Table 2.

IR frequencies of the bands (cm⁻¹) of ligand [H₂L], (1) and its metal complexes.

Comp. number	Molecular formula	ν(H2O/OH)	ν(NH)	ν(C=O)acetyl	ν(C=O)amide	ν(C=N)imine	ν(C=N)oxime	ν(N–O)	ν(OAc)/SO4	ν(M–O)	ν(M–N)	ν(M–Cl)
(1)	[H2L]C12H13N3O4	3360, 3315	3215	1700	1664	1613	1587	1147, 1000, 931	—	—	—	—
(2)	[(HL)Cu(OAc)(H2O)2]·H2O    C14H21N3O9Cu	3430   3520–3080	3260	1680	1650	1605	1575	1155, 1040, 925	1443, 1342	600	575	—
(3)	[(HL)Cu2(OAc)3(H2O)5]·    C18H33N3O15Cu2	3431   3575–3000	3260	1709	1652	1601	1567	1170, 1066   930	1482, 1345	682	582	—
(4)	[(H2L)2Cu(OAc)2]·3H2O    C28H38N6O15Cu	3421   3500–3180	3217	1712	1669	1601	1564	1163, 1068   925	1483, 1382	679	580	—
(5)	[(H2L)CuCl2(H2O)]·2H2O    C12H19Cl2N3O7Cu	3434–3380	3141	1695	1659	1606	1533	1154, 1128   1013, 954	—	662	575	443
(6)	[(H2L)Cu(SO4)(H2O)2]    C12H17N3O10SCu	3500   3250–3100	3202	1717	1667	1611	1529	1190, 1104   977, 915	1260, 1071, 867, 650	618	522	—
(7)	[(HL)Ni(OAc)(H2O)2]·2H2O    C14H23N3O10Ni	3464   3522–3247	3217	1760	1674	1605	1564	1150   1024, 909	1456, 1339	682	620	—
(8)	[(H2L)Ni(SO4)(H2O)2]·H2O    C13H22N3O11SNi	3428   3560–3280	3165	1700	1670	1609	1531	1160, 1102   1043, 925	1240, 1102, 850, 690	592	528	—
(9)	[(HL)Co(OAc)(H2O)2]·3H2O    C14H25N3O11CO	3495   3560–3300	3189	1717	1671	1609	1526	1150, 1065   1022, 920	1465, 1326	624	535
(10)	[(H2L)Co(SO4)(H2O)2]·3H2O    C13H26N3O13SCo	3300   3560–3215	3215	1700	1652	1610	1553	1152, 1030, 956	1232, 1092   858, 650	605	545	—
(11)	[(HL)Mn(OAc)(H2O)2]·3H2O    C14H25N3O11Mn	3408   3570–3300	3217	1695	1600	1595	1565	1170, 1149   1029, 920	1460, 1338	654	587
(12)	[(HL)Zn(OAc)(H2O)2]·2H2O    C14H23N3O10Zn	3315   3600–3280	3214	1700	1673	1601	1566	1154, 1039, 985	1523, 1391	597	535
(13)	[(H2L)Zn(SO4)(H2O)2]·3H2O    C12H23N3O13SZn	3380   3580–3280	3285	1717	1653	1603	1552	1154, 1042, 951	1501, 1366	589	537
(14)	[(HL)Cd(OAc)(H2O)2]·2H2O    C14H23N3O10Cd	3380   3587–3210	3206	1705	1675	1613	1534	1155, 1044, 979	1237, 1115, 1060, 885, 650	616	526
(15)	[(H2L)Cd(SO4)(H2O)2]·2H2O    C12H21N3O12SCd	3428   3652–3275	3217	1710	1652	1587	1565	1160, 1014, 956	1500, 1376	612	588
(16)	[(HL)Hg(OAc)]·H2O    C14H17N3O7Hg	3365   3525–3260	3200	1710	1644	1609	1543	1151, 1008, 936	—	665	524	482
(17)	[(HL)Fe(Cl)2(H2O)]·3H2O    C12H20N3O8Cl2Fe