Compound ν(C=N) ν(Αροματιχ ϖιβ.)) ν(χ-O) ν(M-Σ) ν(M-O) ν(M-N) H2Lb c - 1272 - - - (I) 1585 15081464 1274 360 510 450 (II) 1583 15081456 1270 365 515 455 (III) 1577 15091458 1273 363 518 460 (IV) 1575 15101460 1275 1370 520 410 (V) 1572 15121462 1340 1375 525 465 (VI) 1574 15121459 1344 1377 528 463

Table 6: Characteristic IR bands (cm-1) of the Schiff base and its metal complexesa. aThe serial number corresponds to that used in Table 5. bν( C–S–C) link. vib.= 828 cm-1, cCyclic form.