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  • Electronic Resource  (5)
  • Staphylococcal Nuclease  (2)
  • trinuclear  (2)
  • Hexanuclear zirconium cluster  (1)
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  • Electronic Resource  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    New Hexazirconium Clusters Containing Hydrogen Atoms (1998)
    Springer
    Journal of cluster science 9 (1998), S. 63-91 
    Details
    ISSN: 1572-8862
    Keywords: Hexanuclear zirconium cluster ; pentanuclear zirconium cluster ; cluster hydrogen atom ; bromide ; chloride ; arsine ; amine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Reduction of ZrBr4 with HSnBu3 yielded a blue solid. When this blue solid was treated with PMe3, a hexanuelear cluster [Zr6Br14H4( PMe3)4] (2) was isolated. Reaction of the blue solid with [PPh4]Br in CH2Cl2 resulted in the formation of a paramagnetic and unstable cluster anion, [Zr6Br18H5]2− (3′), which disproportionated to form a new cluster anion, [Zr6Br18H5]3− (4′) and some Zr(IV) species. Compounds containing 4′ can also be obtained from reaction of the blue solid with Br− in MeCN. Reduction of ZrCl4 with HsnBu3 gave a red–brown solid, and [Zr6Cl14H4(AsMe3)4] (9) and [Zr5Cl12H4(AsMe3)5](8) were obtained by reaction of the red–brown solid with AsMe3. No cluster compounds containing amine ligands were obtained in the reaction of the red–brown solid with amines; only compounds containing the [Zr6Cl18 H5]3− anion and ammonium cations were isolated. Altogether ten products were characterized by single crystal X-ray diffraction and where possible, by 1H NMR studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022629506670
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  • 2
    Electronic Resource
    Electronic Resource
    New synthetic routes for the preparation of the triangular trinuclear clusters of tungsten-containing bromine atoms as terminal ligands: Structural characterization of [W3S4Br3(depe)3]PF6·0.5C7 H8 and [W3S4Br3(depe)3]Br·2CH3OH (1990)
    Springer
    Journal of cluster science 1 (1990), S. 287-305 
    Details
    ISSN: 1572-8862
    Keywords: Tungsten ; clusters ; preparation ; triangular ; trinuclear
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Synthetic methods are reported for the preparation of compounds containing the trinuclear triangular cluster [W3S4Br3(depe)3[+. These involve reactions between WBr5 and NaB(C2 H5)3H or NaBH4 as reducing agent in THF, and subsequent addition of methanolic solutions of NaHS and depe ligand. Both compounds, [W3S3Br3(depe)3]PF6·0.5C7H8,1, and [W3S4Br3(depe)3]Br·2CH3OH,2, are characterized by x-ray single crystal studies. Compounds1 and2 crystallize in space group $$P\bar 1$$ . For1,a=10.427 (3) Å,b=15.415(4) Å,c=18.140(5) Å, α=79.36(2)°, β=73.59(2)°, γ=81.54(2)°, andV=2734.8(2) Å3;R=0.050 and for 2a=10.491(3) Å,b=15.074(3) Å,c=18.246 Å, α=95.76(2)°, β=105.82(2)°, γ=98.18(2)°, andV=2718.4(3) Å3;R=0.081. The two cations in1 and2 possess C3 symmetry. The W-W distances are in the range 2.783−2.891 Å (for1) and 2.778−2.785 Å (for2) and the average W-Br distances in1 and2 are 2.616[2] Å and 2.594[4] Å, respectively. Each metal atom in the [W3S4Br3(depe)3]+ ions is attached to one capping sulfur atom, two bridging sulfur atoms, one bromine atom, and one chelating depe ligand. One P atom in depe ligand istrans to μ3-S and the otherP atom istrans to a μ2-S atom. UV-Vis and NMR spectra for these compounds are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032274
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and structural characterization of the isomorphous compounds: [Bu4N][Mo3(μ3-O)(μ-X)3(μ-OAc)3 X 3]·(CH3)2CO,X=Cl, Br (1992)
    Springer
    Journal of cluster science 3 (1992), S. 109-121 
    Details
    ISSN: 1572-8862
    Keywords: Molybdenum ; trinuclear ; oxo ligand ; briding halide ; bridging acetate
    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 reaction of MoCl3(H2O)3 with a mixture of acetic acid and acetic anhydride in the presence of [N(C4H9)4][BF4] followed by crystallization from acetone/hexane gives a 77% yield of dark purple [NBu4][Mo3OCl6(OAc)3]·Me2CO (1). A similar reaction employing MoBr3(H2O)3 gives purple [NBu4][Mo3OBr6(OAc)3]·Me2CO (2) in 50% yield. Also produced in this reaction in low (10–20%) yields are [NBu4]2[Mo4OBr12] · 0.5Me2CO and [NBu4]2[Mo3OBr6(OAc)3] · Me2CO which will be discussed elsewhere Compounds (1) and (2) are isomorphous, space groupP21/n,Z=4 with the following unit cell dimensions, where the values for (1) and (2) are given in that order for each one:a=13.406(4), 13.726(5) Å;b=15.701(4), 15.839(5) Å;c=19.250(5), 19.831(6) Å; β=101.61(2), 102.92(3)°. Both (1) and (2) are eight-electron species in which the mean Mo-Mo distances are 2.578(1) Å and 2.597(1) Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702877
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  • 4
    Electronic Resource
    Electronic Resource
    Staphylococcal nuclease reviewed: A prototypic study in contemporary enzymology (1979)
    Springer
    Molecular and cellular biochemistry 23 (1979), S. 131-141 
    Details
    ISSN: 1573-4919
    Keywords: Nuclease ; Staphylococcal Nuclease ; Micrococcal Nuclease ; Protein Folding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary This is the last in a series of four articles in which the chemical, enzymological and crystallographic work on Ribonucleate (deoxyribonucleate)-3′-nucleotidohydrolase, EC 3.1.4.4 (staphylococcal nuclease, micrococcal nuclease) will be reviewed and correlated. This article discusses the use of the nuclease as a model system for the study of the mechanisms and energetics of the folding-unfolding reaction in proteins and for the study of the interrelationships between amino acid sequence and three-dimensional structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219452
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  • 5
    Electronic Resource
    Electronic Resource
    Staphylococcal nuclease reviewed: A Prototypic study in contemporary enzymology. II. Solution studies of the nucleotide binding site and the effects of nucleotide binding. (1979)
    Springer
    Molecular and cellular biochemistry 23 (1979), S. 3-16 
    Details
    ISSN: 1573-4919
    Keywords: Nuclease ; Staphylococcal Nuclease ; Micrococcal Nuclease ; Enzyme Function and Structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary This is the second of a series of four articles in which the chemical, enzymological and crystallographic work on Ribonucleate (deoxyribonucleate)-3′-nucleotidohydrolase EC 3.1.4.4 (staphylococcal nuclease, micrococcal nuclease) will be reviewed and correlated. This article discusses studies in solution delineating the extent of the binding site of the enzyme and identifying some of the particular amino acid residues that form this site. In addition, the effects of the very potent inhibitory combination of thymidine-3′,5′-diphosphate and Ca2+ on the conformation of the enzyme and its physical, chemical and enzymological properties will be reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226675
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