1184-88-9Relevant articles and documents
New sulfate-bridged dinuclear oxidovanadium complexes
Bazhina, Evgenia S.,Nikiforova, Marina E.,Aleksandrov, Grigory G.,Efimov, Nikolay N.,Ugolkova, Helena A.,Nikitin, Oleg M.,Magdesieva, Tatiana V.,Bogomyakov, Artem S.,Minin, Vadim V.,Sidorov, Aleksei A.,Novotortsev, Vladimir M.,Eremenko, Igor L.
, p. 192 - 198 (2012)
The reaction of oxidovanadium sulfate VOSO4·3H 2O with 4,4′-di-tert-butyl-2,2′-bipyridine (dtb-bpy) in methanol was found to give the complex (VO)2(μ2-SO 4)2(dtb-bpy)2(CH3OH) 2·4CH3OH (1). Single crystal X-ray diffraction reveals that molecule 1 is a centrosymmetric dimer consisting of two {VO(μ2-SO4)(dtb-bpy)(CH3OH)} moieties linked by two bridging sulfate anions. Each vanadium atom is in a distorted octahedral environment formed by two nitrogen and four oxygen atoms. The further reaction of an ethanolic solution of compound 1 with sodium pivalate in CH3CN produces the new dinuclear complex [(VO)2(μ2-O) 2(μ2-SO4)(dtb-bpy)2] ·2CH3CN (2), which does not include pivalate ligands, but contains one bridging sulfate anion and two bridging oxygen atoms. The X-ray study, cyclic voltammetry and magnetic measurements were performed allowing to conclude that both vanadium centers in 2 are in +5 oxidation state. According to ESR studies the dinuclear complex 1 undergoes dissociation upon dissolution in ethanol yielding mononuclear species VO(μ2-SO4)(dtb- bpy)(CH3OH), while solution of 1 in dichloromethane contains dimers exhibiting spin-spin exchange interactions between two paramagnetic monomeric fragments.
Nitric oxide reacts with methoxide
DeRosa, Frank,Keefer, Larry K.,Hrabie, Joseph A.
, p. 1139 - 1142 (2008/09/18)
(Chemical Equation Presented) Despite over a century of reports to the contrary, sodium methoxide has been found to react with nitric oxide (NO). The reaction, whose final organic product is sodium formate, is postulated to occur via an intermediate O-bound diazeniumdiolate [CH3O-N(O)=NO -] that decomposes to formaldehyde and nitrous oxide. Sodium formate forms from the aldehyde via a Cannizzaro reaction. Carboxylate salts have similarly been obtained by exposing sodium benzylate and sodium neopentoxide to NO in dioxane solution. Accordingly, sodium trimethylsilanoate should be considered as a substitute for sodium methoxide as the base used to accomplish the replacement of active hydrogens by the diazeniumdiolate functional group via the Traube reaction.
