Complexation between molybdenum(VI) and citrate: structural characterisation of a tetrameric complex, K₄[(MoO₂)₄O₃(cit)₂]·6H₂O

Complexation of Molybdenum(V) with Glycolic Acid: An Unusual Orientation of Glycolato Ligand in {Mo2O4}2+ Complexes

“…5 Tetranuclear complexes of the same type were prepared with two other R-hydroxycarboxylates, malate and citrate. 6,7 On the other hand, the same type of ligation as found for homocitrate in the FeMo cofactor was observed in a series of mononuclear complexes [MoO 2 L 2 ] 2-(L ) glycolate, S-lactate, 8 S-malate, 9,10 R,R-tartrate, 11 S-and R-mandelate, 12 benzilate, 13 and citrate 14 ). With the research focused mainly on systems with molybdenum in VI oxidation state, we deemed it important to investigate the oxidation states other than VI as well.…”

Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

“…An Anderson polymolybdate salt (NH 4 ) 3 Al (OH) 6 Mo 6 O 18 Á7H 2 O (abbreviated as AlMo 6 ) from a previous study [18] is also added for comparison. Supplementary Data Table S3 shows the attribution of the different modes of vibration observed for all the solids studied [63][64][65][66][67][68][69]. Vibration bands of Ex-CoMoO 4 -S and Ex-CoMo-R-S strongly differ from those observed for free maleic acid and CoMoO 4 .…”

“…The attribution of the different vibration bands is reported in Supplementary Data Table S2[63][64][65][66][67]. Compared to Elemental analysis results following extraction in aqueous solution with maleic acid: Mo, Co, and Al amounts, extraction percentages in Mo, Co and Al, and extraction efficacy rate toward cobalt.Fig.…”

Multicolor Photochromism of Polymolybdate‐Citric Acid Composite Films

“…The peak appears at higher wavenumber for hydrogen bonding, whereas at lower wavenumber for coordination bonding. For film A with [C]/[Mo]＝1.0, the C＝O stretching vibration peaks attributed to ν as (COOH) and ν as (COO -) peaks, [13][14][15] XPS analyses were carried out to determine the molar ratios of Mo 5＋ to Mo 6＋ in the colored films. Figure 5 presents the Mo(3d) core level XPS spectra of the three films.…”

“…A pair of one electron reduced Mo 7 clusters are inclined to be condensed into a diamagnetic species as suggested by the EPR results ( Figure 6, curve c), 10 14 46 Mo O -(the blue species, λ max ＝738, λ sh ≈614 nm). In [Mo 14 O 46 ] 10species, the electrons are delocalized over the four central MoO 6 octahedra. 3 Therefore, the absorption at 738 nm accompanied by a shoulder at 614 nm assigned to 10 14 46 Mo Oand those in the region of 400-550 nm related to two electrons reduced Mo 7 species have been observed and the film displayed a light sea green color.…”