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  • Designed synthesis  (2)
  • (Fe, Co)-base alloys  (1)
  • Springer  (3)
  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The designed synthesis and crystallographic characterization of three novel heterotrimetallic linear complexes of [Et4N][(Ph3P)2{M′S2 MS2Fe}Cl2] (M=Mo,M′=Ag;M=W,M′=Cu, Ag) (1993)
    Springer
    Journal of cluster science 4 (1993), S. 89-103 
    Details
    ISSN: 1572-8862
    Keywords: Designed synthesis ; heterotrimetallic ; linear complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The complexes [Et4N][(Ph3P)2{M′S2 MS2Fe}Cl2] (M=Mo,M′=Ag;M=W,M′=Cu, Ag) have been obtained by reaction of [Et4N]2[S2 MS2FeCl2] (M=Mo, W) with Cu(PPh3)3Cl or Ag(PPh3)3NO3 in MeCN/CH2Cl2, respectively. Crystal data for [Et4N][(PPh3)2 {AgS2MoS2Fe}Cl2] (I): triclinic, P $$\bar 1$$ (No. 2),Z=2,a=13.41(1)Å,b=15.54(1)Å,c=12.30(1)Å, α=105.24(6)°, β=94.63(7)°, γ=101.38(6)°, andV=2399(4)Å3. The bond lengths of Mo-Fe bond and the Mo-Ag distance are 2.756(2)Å and 3.033(2)Å, respectively. Crystal data for [Et4N][(PPh3)2 {AgS2WS2Fe}Cl2] (II): triclinic, P $$\bar 1$$ (No. 2),Z=2,a=13.457(5))Å,b=15.601(6)Å,c=12.338(4)Å, α=105.20(3)°, β=94.61(4)°, γ=101.43(4)°, andV=2426(2)Å3. The bond length of W-Fe bond and the W-Ag distance are 2.786(2)Å and 3.076(1)Å, respectively. Crystal data for [Et4N][(PPh3)2 {CuS2WS2Fe}Cl2] (III): triclinic, P $$\bar 1$$ (No. 2),Z=2,a=13.498(5)Å,b=15.372(4)Å,c=12.340(4)Å, α=105.54(2)°, β=93.32(3)°, γ=101.40(3)°, andV=2401(1)Å3. The bond lengths of W-Fe bond and the W-Cu bond are 2.800(1)Å and 2.851(1)Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702711
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  • 2
    Electronic Resource
    Electronic Resource
    Designed synthesis for some transition metal clusters involving bridging-sulfido ligand (1994)
    Springer
    Journal of cluster science 5 (1994), S. 265-285 
    Details
    ISSN: 1572-8862
    Keywords: Designed synthesis ; transition metal clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Designed synthesis for some transition metal clusters involving bridging-sulfido ligands is reviewed. The basic concept with the use of reactive fragments as building blocks is described. It is shown that the sulfido ligands with lone-pair electrons and the unsaturated coordination sites play important roles in this rational synthesis. The relationship between the metallic coordination types of the sulfido ligands and their assembling activity in the compounds is summarized. Examples of the six kinds of “unit construction” with reactive fragments as building blocks are shown, indicating clearly that the “unit construction” is a reasonable way in the synthesis of transition metal clusters involving bridging sulfido ligands. Finally, the potential application of the “unit construction” schemes in the synthesis of transition metal clusters involving other bridging ligands is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170712
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  • 3
    Electronic Resource
    Electronic Resource
    Sulphidation of someMCrAlYX-type alloys (1993)
    Springer
    Oxidation of metals 39 (1993), S. 107-135 
    Details
    ISSN: 1573-4889
    Keywords: sulphidation ; sulphides ; Co-base alloys ; (Fe, Co)-base alloys ; refractory metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The sulphidation behavior of a series ofMCrAlYX-type alloys, where M is Co or Co and Fe, and X is V, Nb, Mo, or W, added in combination at various levels, has been studied at 750°C in an atmosphere of $$p_{S_2 } $$ ∼ 10−1 Pa and $$p_{O_2 } $$ ∼10−18 Pa. Sulphidation kinetics followed a parabolic rate law for each alloy over prolonged periods of exposure (up to 240 hr). Inclusion of Mo in the alloy containing both V and Nb, and particularly the combined additions of Mo and W, greatly enhanced sulphidation resistance. Partial replacement of Co by Fe also provided superior sulphidation resistance. The scales formed on the Co-based alloys consisted of three subscale layers-an outer layer of Co9S8 and Co3S4, a mid-layer of Cr3S4 and an inner layer of chromium and refractory-metal sulphides. In the case of (Fe, Co)-based alloys, the scales were duplex in nature with an outer layer of Fe3S4, Co9S8 and Cr3S4 and a compact inner layer consisting of sulphides of chromium and refractory metals. For both categories of alloys, the inner layer of refractory-metal sulphides was decorated by an alumina film which inhibited the outward migration of the base elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666613
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