Spectroscopic and polarographic studies of novel imidazole adduct of ammonium trioxovanadate(V). A solution and solid state study

Complex formation between ammonium trioxovanadate(V) and imidazole has been studied and characterized by FT IR, UV/Vis, thermal analysis (TG, DTA, DTG ) and polarographic techniques. Species formed in solid phase yield a yello w coloured product exhibiting an absorbance maximum at 400 nm. The FT IR sp ectra show that the inclusion of imidazole has a significant influence on t he structure and the hydrogen bonding pattern in NH4VO3. Species formed in aqueous solution has been examined by voltammetry. Formation of an adduct o f trioxovanadate(V) with imidazole onto dropping mercury electrode followed by reduction of the sample in DCP of the complex in 0.05 M NH3/NH4Cl buffe r (pH 9.08) resulted in a single peak at -0.875 V.