Molybdenum(VI) complexes with malic acid: their inter-relationships, and the crystal structure of dicaesium bis[(S)-malato(2–)]-cis-dioxomolybdate(VI)–water (1/1)

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.…”

“…The alkoxyl oxygen is also capable of stronger bonding because it provides a more concentrated anionic charge. 9 The only instance with the alkoxyl oxygen located at the trans site, proved by the X-ray structure analysis, is a mononuclear [MoO 3 (cit)] 4-ion with three terminal oxides and a citrato ligand coordinated in a tridentate manner. 46 The R-hydroxycarboxylato complexes of Mo(V) are very rare: there is only one structurally characterized complex with glycolate 8 and a few with citrate.…”

Enantiomeric and mesomeric mandelate complexes of molybdenum – on their stereospecific formations and absolute configurations

“…The related mononuclear cisdioxo complexes have been isolated in the solid state and their structures determined by single crystal X-ray analyses [12,16,18,[34][35][36][37]. In all these investigations, both the molar ratio of the complexing agents and the pH of the solution are crucial.…”

Disodium bis{cis-[nitrilotriacetato(2–)-O1,N,O2]-μ-oxo-dioxomolybdate(VI)}–water (1/8), Na2[Mo2(C6H7NO6)2O5].8H2O

“…The formation of a Mo20 5 core with the nitrilotriacetato ligand at low pH to give the complex anion found in this crystalline compound is to be contrasted with the MoO 2 core developed by the uramildiacetato and malato ligands under corresponding conditions (Knobler et al, 1983). It indicates that the type of core developed within a complex anion forming in aqueous solution can be dependent not only upon pH, but also upon the match of a ligand configuration with possible alternative core structures.…”