Stoichiometric and structural characterization of the compound (NH4)5Mo2Cl9.H2O

An unusual ditantalum (Ta:Ta) compound with a bridging oxo ligand

“…Aside from the toluene molecules, which appear to be distributed over two positions to give partial occupation of each, and to be disordered as well, the structure is very clean and precise. It consists of the binuclear unit shown in Figure 1 plus one chlorine atom that lies 2.893 (7) Á away from the oxygen atom. The bond lengths and angles are listed in Tables III and IV.…”

“…Given that this O-H-Cl hydrogen bond is present, it is then straightforward to formulate the rest of the structure as a dinuclear tantalum(III) complex. The Ta-Cl distances, with an average value of 2.427 [12] Á, which may be compared with the Tam-Cl terminal distances in Ta2Cl6(dmpe)2, which have an average value of 2.415 [7] A, are supportive of the assignment of oxidation state III to the metal atoms. Furthermore, the characteristic tendency of Ta111 to form Ta=Ta bonds with lengths of about 2.70 A is displayed here.…”

Electronic, Infrared, Raman and Resonance Raman Spectra of some Hexahalodi(aquo)dimolybdate(II) Anions, Mo2X6(H2O)22−, with Quadruple Molybdenum‐Molybdenum Bonds

“…1, the electronic spectra of I, 11, I11 and IV at 300 K i n the transmission or diffuse reflectance mode exhibit intense broad bands at about 5 More interestingly, the transmission electronic spectra of these anions at low temperatures (25-100 K) display vibronic structures which are particularly well resolved for the iodo anion IV (Fig. 1).…”

Preparation and characterization of dimeric and tetrameric clusters of molybdenum and tungsten

“…Tungsten dimers are irreversibly oxidized to W^Xg^", WgXgH^", or W2X^(0R)2(R0H) (69). Molybdenum dimers may react with HX to give simple substitution products, MogXg^" (70,71), or under different conditions oxidation to MoXgH " occurs (72). Unlike the 3-tungsten analog, Mo2XgH " may undergo reduction in the presence of trialkylphosphines or pyridine back to quadruply bonded Mo2X^L^ (L = PRg, py) (73).…”