SYNTHESES AND CHARACTERIZATION OF MANGANESE-TELLUROLATE COMPLEXES BY USING CHELATING METALLOLIGAND CIS[MN(CO)(4)(TEPH)(2)](-) AND POTENTIALELECTROPHILIC TEME(+) REAGENT

The cis-[Mn(CO)(4)(TePh)(2)](-), similar to bidentate ligand PhTe(CH2) (3)TePh, acts as a ''chelating metalloligand'' for the synthesis of me tallic tellurolate compounds. The reaction of cis-[Mn(CO)(4)(TePh)(2)] (-) with BrMn(CO)(5) in THF leads to a mixture of products [(CO)(3)BrM n(mu-TePh)(2)Mn(CO)(4)](-) (1) and Mn-2(mu-TePh)(2)(CO)(8) (2). Comple x 1 crystallizes in the triclinic space group <P(1)over bar> with a = 11.309(3) Angstrom, b = 14.780(5) Angstrom, c = 19.212(6) Angstrom, al pha = 76.05(3)degrees, beta = 72.31(3)degrees, gamma = 70.41(3)degrees , V = 2848(2) Angstrom(3), Z = 2. Final R = 0.034 and R(w) = 0.035 res ulting from refinement of 10021 total reflections with 677 parameters. Dropwise addition of (MeTe)(2) to a solution of [Me(3)O][BF4] in CH3C N leads to formation of [Me(2)TeTeMe][BF4], a potential MeTe(+) donor ligand. In contrast to oxidative addition of diphenyl ditelluride to [ Mn(CO)(5)](-) to give cis-[Mn(CO)(4)(TePh)(2)](-) which was thermally transformed into [(CO)(3)Mn(mu-TePh)(3)Mn(CO)(3)](-), reaction of [Mn( CO)(5)](-) with [Me(2)TeTeMe](+) proceeded to give the monomeric speci es MeTeMn(CO)(5) as initial product which was then dimerized into Mn-2 (mu-TeMe)(2)(CO)(8) (4).