cis-Dioxo[2,2'-oxydiethanolato(2–)-0,0',0'']molybdenum(VI), [Mo(C4H8O3)O2]

Structural, Electrochemical, and Theoretical Investigations of New Thio‐ and Selenoether Complexes of Molybdenum and Tungsten

“…Interestingly, the thioether function forms no explicit bond with the molydenum, whereas the analogous ether ligand does form a bond with this metal atom (no analogous compound was published for tungsten). [22] We conclude from this that the structural influence of the ligand atom plays a vital role in structurally demanding ligands (tridentate) but not in those with a simpler geometry (bidentate or monodentate).…”

“…We conclude from all of this that molybdenum forms the dimeric structure, because it is able to keep both of the doubly bonded oxo ligands, and that tungsten forms the trimeric structure because it is able to form a stronger metal-sulfur interaction. This behavior is confirmed by the fact that with similar ligand sets, only a tungsten trimer, [24] where terminal oxo ligands are converted into bridging oxo ligands, and molybdenum monomers [22] and dimers, [25] where the oxo ligands are retained as doubly bonded, are obtained and structurally characterized.…”

“…In contrast, a certain monomeric molybdenum complex with the analogous ligand that contains an ether function instead of the thioether function is known to exhibit an oxygen(ether)-metal bond even though the distance is longer than usual. [22] This is not completely surprising for these kinds of ligands although the analogous cobalt complexes, with ligands where the alkoxylate and the ether/thioether functions are bridged by phenyl rings, show the reverse behavior. With the ether function, no bond is formed between the metal and oxygen atoms, whereas with the thioether function, there is a bond between the cobalt and sulfur atoms.…”

Metal complexes of an amine bisphenol with a thiophene side-arm

“…Bands at~3440 and 3640 cm -1 are due to the presence of coordinated and hydrogen bonded methanol molecules. Complex 2b has generally similar IR spectrum although it presents a strong IR absorption at 834 cm -1 , which is typical for a non-symmetrically bridged Mo-O-Mo core 20 . Furthermore, complexes 2b show only a single stretch at 941 cm -1 instead of a characteristic doublet for cis-MoO 2 moieties in complexes 2a.…”

Chemical, electrochemical and structural studies of somecis-dioxomolybdenum(VI) complexes of two tridentate ONS chelating ligands

“…In this study synthesis, characterization, chemical and electrochemical activity of some Mo(VI) complexes are reported which are found to resemble some properties of the active sites of molybdoenzymes [13][14][15][16][17]. The ligand frame used in this study consists of Schiff bases derived from condensation of 2-hydroxyacetophenone with S-benzyl and S-methyl dithiocarbazates.…”