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, cilt.30, ss.451-459, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 30 Konu: 4
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1007/s11243-005-1035-0
  • Dergi Adı: TRANSITION METAL CHEMISTRY
  • Sayfa Sayıları: ss.451-459

Özet

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.