A very simple, ultra-sensitive and highly selective non-extractive spectrophotometric method for the determination of trace amount of molybdenum(VI) using 5,7-dibromo-8-hydroxyquinoline (DBHQ) has been developed. 5,7-Dibromo-8-hydroxyquinoline reacts in a slightly acidic solution (0.05 - 1.0 M H2SO4) with molybdenum(VI) to give a deep greenish-yellow chelate which has an absorption maximum at 4...

An amine bisphenol ligand with an ammonium iodide group in the pendant arm (H2L) reacts V, Mo and U oxometal precursors to form oxovanadium(V), dioxomolybdenum(VI) dioxouranium(VI) species, respectively. In methanol solutions, vanadium(V) molybdenum(VI) 1:1 complexes [VO(OMe)(L)]I·2MeOH [MoO2(L)(H2O)]I·2MeOH, where cationic charge is counterbalanced by anion. Uranium(VI) forms a complex which a...

* corresponding author. e-mail: [email protected] The interaction of Mo(VI) and tetrazolium violet (TV) has been examined. The ion-associate formed is extracted into 1,2-dichloroethane. The tetrazolium violet : molybdenum(VI) : 3,4,5-trihydroxybenzoic acid ratio (R) is 2 : 1 : 2. The optimum conditions have been established. Beer’s law is obeyed in the range of 0.2–5 μg ml–1 molybdenum(VI...

The reagent 4-hydroxybenzaldehyde thiosemicarbazone (4-HBTS) has been used for the determination of Mo(VI) by spectrophotometric method. The reagent 4-HBTS gives green colour with Mo(VI) solution of weak acidic medium and the maximum absorbance was observed at 365nm, in acidic buffer p H 6.0. The molar absorptivity and Sandell’s sensitivity of Mo(VI)4-HBTS complex are 1.25 x 10 L mol cm and 0.0...

Four new cis-dioxomolybdenum(VI) complexes of the closed formula [MoO2(L)CH3OH] have been obtained by condensation bis(acetylacetonato)dioxomolybdenum(VI) with S-allyl/propyl thiosemicarbazones in methanol. The compounds were identified elemental analysis, and molecular characterization UV-Vis, FT-IR, 1H-NMR 13C-NMR spectroscopies. Also, crystal structures 1 2 resolved X-ray diffraction analysi...

A series of molybdenum(vi) cis-dioxo complexes containing tetradentate salan ligands with different para-substitutions on the phenoxy group have been prepared. These complexes catalyse the oxygen atom transfer reaction between dimethylsulfoxide and triphenylphosphine. During oxo transfer catalysis, the complexes are resistant to formation of catalytically inactive oxo-bridged dimeric Mo(v) comp...