Air Oxidation Of Solutions Research Articles

Syntheses and structural characterization of two novel oxygen bridged dinuclear Mo-complexes containing bdmpza as ligand, trans-[Mo 2O 5(bdmpza) 2] and trans-[Mo 2O 3(NCS) 2(bdmpza) 2] · 4CH 3CN

Mixtures of (picH)[Mo(NCS) 4(pic) 2]/Hbdmpza and (P(C 6H 5) 4) 2[MoO(NCS) 5]/Hbdmpza or K 3[Mo(NCS) 6]/Hbdmpza (pic = 4-methylpyridine, Hbdmpza = bis(3,5-dimetylpyrazol-1-yl) acetic acid) were refluxed in acetonitrile. By air-oxidation of solutions, trans-[Mo 2O 5(bdmpza) 2] ( 1) compound containing dinuclear Mo 2 O 5 2 + core, and trans-[Mo 2O 3(NCS) 2(bdmpza) 2] · 4CH 3CN ( 2) complex containing dinuclear oxo-bridged Mo 2 O 3 4 + fragment, have been prepared and characterized by single-crystal X-ray crystallography.

Two Tetrahalooxomolybdate(V) Structures, [Ph3PNPPh3][MoOBr4] and [PPh4][MoOI4(H2O)

Both title compounds, bis(triphenylphosphine)iminium tetrabromooxomolybdate(V), (C36H30NP2)[MoOBr4], and tetraphenylphosphonium aquatetraiodooxomolybdate(V), (C24H20P)[MoOI4(H2O)], form by air-oxidation of solutions containing the [Mo3X12]3− anion, i.e. the bis(triphenylphosphine)iminium salt for X = Br and the tetraphenylphosphonium salt for X = I. Both anions have been reported previously in different salts. The geometry of the tetrabromooxomolybdate(V) anion is square pyramidal with the oxo ligand occupying the apical position, whereas the aquatetraiodooxomolybddate(V) anion can be described as a pseudo-octahedron with the aqua and oxo ligands occupying trans positions.

Preparation and spectroscopic properties of 2‐benzothiazolyl araldehyde hydrazones

AbstractNotwithstanding its tendency toward air oxidation in solution, 2‐hydrazinobenzothiazole I reacted with aromatic aldehydes in ethanol to give the corresponding hydrazones III‐XV in high yields and analytical purity. In related examples, acylation took place under similar conditions to produce hydrazides XVI‐XX. The near‐infrared bands of the absorption spectra of the araldehyde hydrazones have been associated with charge transfer and appeared to correlate with structural elements of the compounds in a way suggesting that the charge transfer was intermolecular.

Nukleophile Substitution an Thionyl- und Sulfurylchlorid mit Metallaten. Synthese und Struktur der SO- bzw. S 0 2-Komplexe [(C6H5O)3P]2(CO)2Fe(SOn)(n=1, 2) / Nucleophilic Substitution at Thionyl- and Sulfuryl Chloride by Metallates. Synthesis and Structure of the SO- and SO2-Complexes [(C6H5O)3P]2(CO)2Fe(SOn)(n=1, 2)

The synthesis of the SO- and SO2-complexes 3 and 4 follows equations (1) and (3) by nucleophilic substitution of SOCl2 or SO2Cl2 by the same metallate 2. 4 can also be obtained by simple air oxidation of solutions of 3 according to equation (2). Spectroscopic investigations indicate a trigonal bipyramidal configuration on iron with both phosphite ligands in axial positions and the sulfur oxide ligands in equatorial positions together with both carbonyl ligands. The X-ray structure analysis of the SO2 complex 4 shows the exactly planar coordination of the sulfur atom and the nearly perpendicular orientation of the SO2 plane to the equator plane; thus complex 4 is isolobal to SO3. The SO ligand in 3 coordinates as a 2c-2e-system in a bent structure with both atoms lying in the equatorial plane.

Cubic FeS, a Metastable Iron Sulfide

Studies of the corrosion products of metallic iron formed in the absence of air oxidation in solutions of hydrogen sulfide have revealed the existence of a new phase, cubic FeS, associated with tetragonal iron sulfide, Fe(1 + x)S. This new phase is metastable and has a sphalerite-like structure.