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Table 6 Magnetic moments, electronic spectra and molar extension coefficient 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 μeff (BM) Intraligand and charge transfer transition, cm−1 (*ɛ) d–d transition cm−1 (*ɛ) Proposed structure
OBH 38,460 (790)  
[Co(OBH)2Cl]Cl·½EtOH 2.51 37,450 (195.8); 23,320 (115.8) 15,250 (94) Square-pyramid
[Zr(OBH)Cl4]·2H2O 36,495 (399); 22,830 (117.6) Octahedral
[Zn(OBH–H)2] 37,450 (530); 35,335 (885) Tetrahedral
[VO(OBH–H)2]·H2O 0.00 38,060; 35,040; 29.210   Square-pyramid
[Cu(OBH)2Cl2]·2H2O 1.45 39,840; 37,590; 25,510; 23,810 (350) 20,080 Octahedral
[Ni2(OBH)Cl4]·H2O·EtOH 1.36a 39,840; 37,590; 28,330 19,050 Square-planar + tetrahedral
[Pd2(OBH)(H2O)2Cl4]·2H2O 0.00 37,540; 28,470 21,500 (310) Square-pyramid
  1. *ɛ is the molar extension coefficient (mol−1L)
  2. aThe value per one nickel atom