New molybdenum (VI) catalyst for the epoxidation of alkenes and oxidation of sulfides: An experimental and theoretical study

cis‐Dioxomolybdenum(VI) complexes with unsymmetric linear tetradentate ligands: syntheses, structures and bromoperoxidase activities

“…Thus for 1 , 2 , 3 , 4 , 5 the first low‐energy band is assigned to ligand‐to‐metal charge transfer transition, while the second higher energy band is attributed to a ligand‐centred transition. Similar pairs of absorption bands observed for complexes of cis ‐dioxomolybdenum(VI) with ligands having comparable donor atoms are reported to be due to ligand‐to‐metal charge transfer and ligand‐centred transitions, respectively …”

“…The remaining cis bond angles span the broad range of 82.01(9)–103.51(15)°, while the trans bond angles are within a relatively narrow range of 155.51(10)–163.82(10)°. In general, the bond lengths and bond angles within the metal ion coordination spheres of 1 , 2 , 3 , 4 (Table ) lie in the range reported for cis ‐dioxomolybdenum(VI) complexes with ligands coordinating through comparable donor atoms …”

“…The aromatic and aliphatic C  H stretches appear as multiple bands in the range 2830–2970 cm −1 . The symmetric and asymmetric stretches of the { cis ‐MoO 2 } 2+ core are observed as two strong and sharp bands in the ranges 914–926 and 876–887 cm −1 , respectively …”

cis-Dioxido-molybdenum(VI) complexes of tridentate ONO hydrazone Schiff base: Synthesis, characterization, X-ray crystal structure, DFT calculation and catalytic activity

“…The other oxido group (O4) occupies one of the axial positions, the second being taken by the coordinated EtOH ligand (1) . For this compound this interaction between the EtOH molecule and the molybdenum atom was demonstrated to be a formal bond [32]. In the case of (2), the pyridine donor nitrogen atom [N(1)] is situated at 2.448(2) Å.…”

Synthesis, spectral characterization and crystal structure studies of a new hydrazone Schiff base and its dioxomolybdenum(VI) complex

“…The coordination chemistry of molybdenum(VI) has attracted interest for biochemical significance [1][2][3] and as catalysts in industrial processes such as epoxidation of olefins [4][5][6][7][8], olefin metathesis [9], isomerization of allylic alcohols [10], and oxidation of sulfides [11,12]. Dioxomolybdenum(VI) complexes have been studied as models for the oxidized forms of molybdoenzymes, such as aldehyde oxidase and sulfite oxidase which are supposed *Corresponding authors.…”