Synthesis, Characterization and Crystal Structure of a Novel Decavanadate Salt, [V0.50(H2O)5]2[H2(V10O28)]·4(H2O)

Abstract

A novel decavanadate salt, [V 0.50 ( At this dimer moiety, it has been thought that the oxygen atoms of two water molecules form the bridges between two V(IV) center ions. The presence of high spin V(IV) (I = 7/2) in the compound was verified by EPR measurements. In addition, decavanadate unit gave a shoulder at about 400 nm on the UV-Vis. spectrum of the compound. Moreover, at the FT-IR spectrum, the symmetric and asymmetric stretching vibrations of the bridging V-O-V units were observed. On the cyclic voltammogram of the compound, two reduction peaks (V(V)-V(IV) and V(IV)-V(II) reduction steps, respectively) at −1.03 and −1.35 V were observed at the cathodic scan; however, one oxidation peak (V(II)-V(III) oxidation step) at −1.22 V showed at the anodic scan. NMR results also support that the synthesized salt includes the coordinated water molecules and hydroxo groups.

Tris(2-Pyridylmethylamine)V(O)2 Complexes as Counter Ions of Diprotonated Decavanadate Anion: Potential Antineoplastic Activity

“…The strong V=Ot stretching vibration at 940 cm -1 has a shoulder at 970 cm −1 assigned to the cis V=O 2 asymmetric band. These stretching vibrations agree with the terminal V=O groups present in related oxidovanadium(V) complexes ( Biçer et al, 2017 ). The medium intensity bands at 840, 800, and 730 cm −1 corresponds to the asymmetric vibrations of the bonds (V–O b –V), where the oxygen atom bridge two vanadium ions, while the three bands at 570, 510, and 430 cm −1 reveal symmetric vibration modes of the bonds (V–O b –V), in agreement with other FTIR spectra reported previously for related compounds ( Guilherme et al, 2010 ), ( Sánchez-Lara et al, 2014 ; Sánchez-Lara et al, 2015 ; Sánchez-Lara et al, 2016; Sánchez-Lara et al, 2018 ; Sánchez-Lara et al, 2019 ; Sánchez-Lara et al, 2021 ), ( García-García et al, 2021 ).…”

Synthesis of novel hybrid decavanadate material (NH4)2(H2en)2{V10O28}.4H2O: Characterization, anticorrosion and biological activities

“…800 nm] at room temperature of (H 2 en) 2 (NH 4 ) 2 {V 10 O 28 }.4H 2 O in both 1 M HCl and 3% NaCl at the same concentration of 5×10 -4 M. As shown in Figure 7, the 280 nm (black line) and 391 nm (red line) bands are attributed to the V 5+ tetrahedrally coordinated in monovanadates and octahedrally in decavanadates, respectively [36][37][38].…”