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Synthesis, Structural and spectroscopic studies of three vanadates (Hdea)5(HV10O28), (H2en)3(V10O28).2H2O and (H2en)(VO3)2

Three phases (Hdea) 5 (HV 10 O 28 ), [(H 2 en) 3 (V 10 O 28 )].2H 2 O and (H 2 en)(VO 3 ) 2 (dea : diethylamine, en : ethylenediamine) were synthesized by slow evaporation from aqueous solutions. This study shows the influence of synthesis pH on the stability of the vanadate anions. The single crystal structures of these compounds have been solved and refined by X-ray diffraction. All three compounds crystallize in monoclinic system, space groups C2/c, P2 1 /n, and P2 1 /c, respectively. The cohesion between the vanadate groups and organic cations is provided by hydrogen bonds and Van De Waals interactions. The infrared and Raman spectra have proved the presence of organic cations, (VO 3 ) n n- and (V 10 O 28 ) 6- anions and the water molecules in the [(H 2 en) 3 (V 10 O 28 )].2H 2 O compound.