Peroxovanadium(V) complexes of α-hydroxyhippuric acid. The X-ray crystal structure of (NPr4)2[V2O2(O2)2(α-hhip)2] · 5H2O, [α-hhip=α-hydroxyhippurato (2–) − C9H7NO4 (2–)]

Peroxovanadium(V) complexes of α-hydroxyhippuric acid (α-H2hhip), M2[V2O2(O2)2(α-hhip)2] · nH2O [M=NMe4+ (1), NPr4+ (2); n=0.5, 5], have been prepared and characterized by elemental analysis and by IR and Raman spectroscopies. The X-ray crystal structure of 2 has been determined as the first crystal structure of an α-hydroxyhippurato complex. A single crystal X-ray diffraction study has shown that the α-hhip ligand behaves as a tridentate chelator adopting the (O−, COO−, CO) donor set. The coordination geometry of the vanadium atom is a distorted pentagonal bipyramid.