Synthesis and Characterization of Halo, Cyanato, Thiocyanato and Selenocyanato Molybdenum(VI) Dioxo and Dioxo-μ-oxo Complexes

Abstract

Ten new 4,4¢-bipyridyl molybdenum(VI) dioxo and dioxo-l-oxo complexes have been synthesized and fully characterized. The substituents on the bipyridyl moiety are: t-butyl, benzyl, carbomethoxy, nitro and methoxy groups, whereas the functional ligands on molybdenum are: chloro, bromo, thiocyanato, cyanato and selenocyanato groups. The molecular structure of three of them have been determined by single crystal X-ray crystallography and showed distortions from an octahedral geometry in accord with the nature of the various substituents.

A one-pot synthesis of disiloxy, dihalo and dithiocyanato dioxo complexes bearing a bidentate N-ligand from sodium or potassium molybdate tungstate and perrhenate

“…The All these values are identical with those obtained for the same dichloro-dioxoMo(VI) complex prepared by another synthetic route [13]. Its X-ray structure has been reported previously [13].…”

“…The IR and NMR values are quite close to the chloro analogue showing very little difference when varying the halogen. This was already observed with the bidentate ligand 4,4 0 -t-butyl-2,2 0 -bipyridine [13]. Its structure was confirmed by an X-ray spectroscopic analysis (Fig.…”

“…The 1 H-NMR in CD 2 Cl 2 , showed a typical set of signals for a bipyridyl entity in accord with a C 2 symmetry at d 9.32, 7.67 and 7.20 for the aromatic hydrogen and at d 4.05 for the methoxy group. It should be noted that the synthesis of this same complex was attempted with the multistep reported procedure [13], yielding a mixture of the desired product contaminated with a dimeric species, and thus, was not reported.…”

Synthesis and X-ray diffraction data of dichlorodioxido (4,4-dimethoxycarbonyl-2,2′-bipyridyl) molybdenum(VI)

“…The ligand 4,4 ′ -dimethoxycarbonyl-2,2 ′ -bipyridyl was previously synthesized according to the literature procedure (Arzoumanian and Bakhtchadjian, 2006). CH 2 Cl 2 solution containing 2.57 mmol of 4,4 ′ -dimethoxycarbonyl-2,2 ′ -bipyridyl (0.7 g) was added over a slenchk containing 3 mmol of solid MoO 2 Cl 2 .…”

Application of a dioxo-molybdenum(VI) complex anchored on TiO2 for the photochemical oxidative decomposition of 1-chloro-4-ethylbenzene under O2

“…Recently, TiO 2 was successfully used as a support material for the syntheses of covalently grafted organometallic entities such as dioxo-Mo(VI)-dihalo[4,4 0 -dicarbixylato-2,2 0 -bipyridine] complexes [13][14][15]. The oxo, dioxo, peroxo or l-oxo Mo complexes with different ligands are known as oxygen transfer agents under homogeneous conditions, in various oxidation processes of organic molecules [16,17]. The primary oxidant could be DMSO, N 2 O or O 2 .…”