Structural and magnetic studies on mono- and polynuclear chromium ascorbate complexes

Zumreoglu-Karan B., Ay A. N. , Unaleroglu C., Firat T., Ristau T., Jabs W.

TRANSITION METAL CHEMISTRY, vol.30, no.4, pp.451-459, 2005 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 2005
  • Doi Number: 10.1007/s11243-005-1035-0
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.451-459


Polynuclear chromium ascorbate complexes were isolated and physicochemically analyzed in a comparative manner with their mononuclear analog (1). Characterization by elemental analysis, electronic, vibrational, C-13-n.m.r and mass spectroscopies, and variable temperature magnetic susceptibility studies, allowed structural proposals for the binuclear, [Cr-2(mu-OH)(2)(H2O)(C6H7O6)(3)(OH)] center dot 4H(2)O (2), and trinuclear, [Cr-3(mu-O)(3)(H2O)(6)(C6H7O6)(3)] (center dot) 4 H2O (3) complexes. The pseudo-octahedral Cr-III centers were suggested to be connected through hydroxo bridges in (2) and in (3) by oxo bridges forming a hexocyclic ring.