Table 2: IR frequencies (Cm1 ) of folic acid (FO) and its metal complexes.

AssignmentsCompounds
Folic acidFe-folate complexCu-folate complex

3421341533813388
(NH) amide 323031753220
(CH)310629263090293030302930
(CH)28402820277028302805
(C O) amide I 165216581655
(COOH)1718
(COO−)156916131603
(CH)148314131448140114451400
(COO−)145313691350
(NH) amide II 152815201532
(CC)132313031300
(CN)1230119111061185110611861102
(CC)971980955
(CC)764767766
(M–O)587520585521