The Crystal Structure of Ammonium Fluorooxodiperoxovanadate(2--), (NH4)2[VFO(O2)2].

Peroxido Complexes of Vanadium(V) as Ligands. Crystal Structures of [Cd(NH3)6][{VO(O2)2(OH)}2{μ-Cd(NH3)4}] and [{VO(O2)2(Im)}2{μ-Cu(Im)4}] (Im = Imidazole)

“…We can therefore suppose that the structure of the elusive {VO(O 2 ) 2 (OH)} 2− ion as appearing in 2 represents its real structure also in solution. Interestingly, the V−OH bond is significantly shorter than the V−N bonds in 1 and 3 and is comparable with the 32 The comparison of three different modes of coordination of diperoxidovanadium complexes, namely, via equatorial peroxoxygen atom (1), via equatorial OH − ligand (2), and via doubly bonded oxygen atom (3), is presented in Figure 6. The hexacoordinated Cu and Cd atoms occupy the centers of slightly distorted tetragonal bipyramids.…”

“…We can therefore suppose that the structure of the elusive {VO(O 2 ) 2 (OH)} 2– ion as appearing in 2 represents its real structure also in solution. Interestingly, the V–OH bond is significantly shorter than the V–N bonds in 1 and 3 and is comparable with the V–F bonds in K 2 [VO(O 2 ) 2 F] and (NH 4 ) 2 [VO(O 2 ) 2 F] …”

“…Interestingly, the V−OH bond is significantly shorter than the V−N bonds in 1 and 3 and is comparable with the V− F bonds in K 2 [VO(O 2 ) 2 F] 31 and (NH 4 ) 2 [VO(O 2 ) 2 F]. 32 The comparison of three different modes of coordination of diperoxidovanadium complexes, namely, via equatorial peroxido oxygen atom (1), via equatorial OH − ligand (2), and via doubly bonded oxygen atom (3), is presented in Figure 6. The hexacoordinated Cu and Cd atoms occupy the centers of slightly distorted tetragonal bipyramids.…”

NMR study of the [VO(O2)2F]2− ion in solution: Synthesis, vibrational spectra and crystal structure of [NH3CH2CH2NH3][VO(O2)2F]

“…The V-O p cis bonds are significantly longer than the V-O p trans bonds (vide infra). This asymmetry of the V(O p ) 2 groups was already repeatedly observed [1,2,5,6] and qualitatively explained [18]. The V-F bond length, 1.9167 (10) The apical oxygen atom is ''linked'' to the vanadium atom of the neighbouring anion via a long distance interaction [d(V Á Á Á O) = 2.8730(12) Å ].…”

“…Although the syntheses and characterization of a number of fluorooxoperoxovanadates have been reported [1][2][3][4][5][6][7][8], the data on formation and stability of the fluorooxoperoxovanadate ions in solutions are entirely lacking.…”