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

• Published in: Transition metal chemistry (Weinheim) Vol. 30; no. 4; pp. 451 - 459
• Main Authors: Zümreoglu-Karan, Birgül, Ay, Ahmet N., Ünaleroglu, Canan, Firat, Tezer, Ristau, Thomas, Jabs, Wolfgang
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.05.2005
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-005-1035-0

Polynuclear chromium ascorbate complexes were isolated and physicochemically analyzed in a comparative manner with their mononuclear analog (1). Characterization by elemental analysis, electronic, vibrational, ^sup 13^C-n.m.r and mass spectroscopies, and variable temperature magnetic susceptibility studies, allowed structural proposals for the binuclear, [Cr^sub 2^(μ-OH)^sub 2^(H^sub 2^O)(C^sub 6^H^sub 7^O^sub 6^)^sub 3^(OH)] · 4H^sub 2^O (2), and trinuclear, [Cr^sub 3^(μ-O)^sub 3^(H^sub 2^O)^sub 6^(C^sub 6^H^sub 7^O^sub 6^)^sub 3^] · 4 H^sub 2^O (3) complexes. The pseudo-octahedral Cr^sup III^ centers were suggested to be connected through hydroxo bridges in (2) and in (3) by oxo bridges forming a hexocyclic ring.[PUBLICATION ABSTRACT]