Аннотация
Four oxoalkoxo vanadium(V) complexes, OV(OCH3)(2)Q(2) (1),
OV(OC2H5)Q(2) (2), OV((OPr)-Pr-i)Q(2) (3), and
OV((OBu)-Bu-t)Q(2) (4), were synthesized by reaction of
OV((OBu)-Bu-t)(3) and 8-hydroxyquinoline in a facile process. The
complexes were characterized by elemental analysis, UV-Vis and infrared
spectroscopies, as well as H-1, C-13, and V-51 NMR. The crystal and
molecular structure of 1, the first binuclear alkoxo-bridged oxoalkoxo
vanadium(V) complex, and 2 were determined by X-ray diffraction from
single crystals. Complex 1 is a dimer with distorted octahedral
geometry, while 2 is monomeric with distorted octahedral geometry. H-1
NMR data revealed that alkoxy signal of 1-3 (OCH3, OCH2R and OCHR2) are
deshielded with the trend 5.68, 6.14, and 6.84 ppm, respectively. V-51
NMR data of these complexes are in the range of reported chemical shifts
of complexes of the type VO6-nNn (n = 0-2).
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