Oxoperoxo(citrato)- and Dioxo(citrato)vanadates V
Synthesis, spectra, and structure of a hydroxyl oxygen bridged dimer, K₂[VO(O₂)(C₆H₆O₇)]₂·2H₂O
The first citrato complexes of vanadium have been prepared: M1[VO(O2)(C6H6O 7)]·H2O (M1 = K, NH4, Cs) and K[VO2(C6-H6O7)]. They crystallized from aqueous solution and were characterized by elemental analysis, IR and UV-visible spectroscopy and X-ray structure analysis. Assignment of the characteristic peroxo IR bands in oxomonoperoxo(citrato)vanadates(V) was done by comparison with the spectrum of potassium dioxo(citrato)vanadate(V). X-ray structure analysis of K2[VO(O2)(C6H6O7)] 2·2H2O revealed the presence of a novel stereochemical ligation of the tridentate citrate, involving bridging hydroxyl oxygens to form a dimer and enclosing vanadium in slightly distorted pentagonal pyramids. A relatively short O-O bond of 1 427 (1) Å was found in symmetrically coordinated peroxo ligands, corresponding well with the observed high v(O-O) stretching frequency of 933 cm-1. The relationship of these compounds to the biochemistry of vanadium is discussed. © 1989 American Chemical Society.
C. Djordjevic et al., "Oxoperoxo(citrato)- and Dioxo(citrato)vanadates V," Inorganic Chemistry, American Chemical Society (ACS), Jan 1989.
The definitive version is available at http://dx.doi.org/10.1021/ic00303a022
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© 1989 American Chemical Society (ACS), All rights reserved.