117624-55-2Relevant academic research and scientific papers
Vanadium(V) Complexes with OO and ON Ligands as Models for Vanadium Coordination Sites in Bimolecules: The Dependence of 51V Shielding on Steric Effects
Weidemann, Carola,Priebsch, Wolfgang,Rehder, Dieter
, p. 235 - 244 (2007/10/02)
Vanadium(V) complexes of the type VO5-nNn (n = 0-2), VO6-nNn (n = 0-3) and VO7-nNn (n = 0-2) containing mono- to pentadentate oxygen and nitrogen ligands exhibit chemical shifts δ(51V) of -380 to -750 ppm (relative to VOCl3) with the highest shielding found in complexes with 3-membered ring structures (peroxo and hydroxylamido complexes).In the complexes V*O(OR)(LL)2 , shielding increases in the order CH2R', CH(R'R''), CR'(R'')2.The compounds were obtained from the reaction of mono- and polyhydric (including cyclic) alcohols with 2(μ-O) or VOCl(pbha)2, or directly from vanadate and the ligands.Chiral alcohols (R*OH) give rise to two resonance signals corresponding to the two diasteromeric pairs of enantiomers.The findings from the complex series VO(OR)(oxin)2 also allow for the assessment of the mode of coordination of several nucleosides (R = inosine, uridine and 2'-deoxyuridine).VOCl(pbha)2 crystallizes in the monoclinic space group P21/n with the following cell parameters: a = 1184.3, b = 1564.1, c = 1364.4 pm; β = 91.94 deg.The coordination geometry is distorted octahedral; the V-O double bond (180.1 pm) is remarkably long. - Keywords: Nucleoside coordination/ Vanadium(V) complexes/ Vanadium-51 NMR
