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Table 4 IR band assignments of OBH and its complexes

From: Spectral, thermal, molecular modeling and biological studies on mono- and binuclear complexes derived from oxalo bis(2,3-butanedionehydrazone)

Compound ν(NH) ν(C=O) ν(C=N) ν(C=N)a ν(C–O) ν(M–O) ν(M–N) Observations
OBH 3325 (s) 1701 (s) 1605 (m)  
[Co(OBH)2Cl]Cl.½EtOH 3325 (m) 1699 (s) 1612 (w) 464 (m) 3415 (br) for EtOH
[Zr(OBH)Cl4]·2H2O 3326 (vbr)a 1686 (m) 1585 (m) 495 (br)  
[Zn(OBH–H)2] 1699 (s) 1605 (w) 1550 (w) 1140 (w) 463 (s)  
[VO(OBH–H)2]·H2O 1696 (s) 1608 (w) 1552 (w) 1142 (w) 463 (m) 3412 (br) for H2O; ν(V=O) at 961
[Cu(OBH)2Cl2]·2H2O 3325 (m) 1701 (s) 1610 (br) 464 (m) 3415 (br) for H2O
[Ni2(OBH)Cl4]·H2O·EtOH 3324 1676 (br) 1552 (sh) 464 (m) 539 3389 (br) for H2O
[Pd2(OBH)(H2O)2Cl4]·2H2O 3327 (w) 1644 1542 467 542 3441 (br) for H2O
  1. aThe value for NH and H2O