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  • Space Radiation  (6)
  • General Chemistry  (3)
  • Polymer and Materials Science  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Mono(cyclooctatetraenyl)samarium Complexes: the Return of the Normally “Inaccessible” Bis(trimethylsilyl)amido Derivative (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1827-1830 
    Details
    ISSN: 1434-1948
    Keywords: Samarium ; Early organolanthanides ; Bis(trimethylsilyl)amido ; Cyclooctatetraenyl ; Lanthanides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complexes [(COT)Ln{N(SiMe3)2}(THF)] (Ln = late lanthanide metal) are readily accessible but, until now, the samarium analogue has proved elusive. The latter can be formed in solution but is easily desolvated during the isolation process, leading to a highly associated complex which is only soluble in coordinating solvents or in the presence of ancillary ligands.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Anionic Monosubstituted Cyclopentadienylsamarium Derivatives: Catalysts for a Stereospecific Isoprene Polymerization (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1721-1727 
    Details
    ISSN: 1434-1948
    Keywords: Samarium ; Allyl complexes ; Carbene adducts ; Organolanthanides ; trans-Polyisoprene ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New alkyl and allyl complexes 1-3 {1: [Cp′2Sm(C3H5)]n, Cp′ = Me3CC5H4; 2: [Me4C2(C5H4)2]Sm(C3H5)2Li(dme),dme = (CH3OCH2CH2OCH3); 3: Cp′2SmMe2Li(dioxane)} were synthesized from (Cp′2SmCl)2and from the magnesium derivative [Me4C2(C5H4)2]SmCl · MgCl2(THF)4 (4). The ansa anionic complex 2 exhibited good activity for the stereospecific 1,4-trans polymerization of isoprene, whereas the neutral derivative 1 was inactive. In the same way, the anionic complex [Cp′2SmMe2]Li(dioxane) (3) was found to be an ethylene polymerization catalyst of very short lifetime. The lack of reactivity of 1 is related to the associated structure of this coordinatively unsaturated complex: this fact was established by the formation of the carbene adduct Cp′2Sm(C3H5)[C(NiPr)2(CMe)2] (1′). Crystals of 1′ were isolated but this new compound undergoes a partial rearrangement into a tris-Cp′ species in solution. Similar behaviour is observed for the analogous complex Cp′2SmCl[C(NiPr)2(CMe)2] (1′′). The X-ray crystal structure revealed the formation of the adduct, as a toluene solvate, which exists in benzene solution in equilibrium with Cp′3Sm and Cp′SmCl2[C(NiPr)2(CMe)2]2. The catalytic behaviour of 2 is compared with that of other early lanthanide derivatives.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and Reactivity of Bis(phospholyl)neodymium(III) and -samarium(III) Chlorides and Alkyl Derivatives (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1041-1045 
    Details
    ISSN: 1434-1948
    Keywords: Organolanthanide ; Neodymium ; Samarium ; Phospholyl ; Hydrides ; Lanthanides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of 2,3,4,5-tetramethylphospholylpotassium [C4Me4PK] with [LnCl3(THF)x] (Ln = Nd, Sm) in a 2:1 ratio gave unsolvated ate complexes of the formula [(C4Me4P)2LnCl2K]. Crystallisation of the samarium complex from ether afforded a polymeric ether solvate: {[(η5-C4Me4P)Sm(μ3-Cl)2(μ:η5,η1-C4Me4P)K(Et2O)]∞}, which was characterised by X-ray crystallography. Reaction of [(C4Me4P)2LnCl2K] with [LiCH(SiMe3)2] in toluene gave the alkyl complexes [(C4Me4P)2LnCH(SiMe3)2]; these complexes were most efficiently prepared from [LnCl3(THF)x], [KC4Me4P] and [LiCH(SiMe3)2] in a one-pot procedure. Reaction of [(C4Me4P)2LnCH(SiMe3)2] with molecular hydrogen gave [(C4Me4P)2NdH], when Ln = Nd, whereas, when Ln = Sm, reduction occurred and the already known [(C4Me4P)2Sm] was isolated instead.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and β-conformation of sequential polypeptides containing arginine, histidine, and leucine (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 2299-2310 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alternating poly(Arg-Leu) and copolypeptides with Arg-Leu and His-Leu sequences were prepared by condensation of the corresponding p-nitrophenyl dipeptide esters in the presence of 1-hydroxybenzotriazole. Arginine was used without any protection and histidine side chains were protected using π-benzyloxymethyl group recently introduced in peptide chemistry. The ability of these polypeptides with alternating hydrophilic and hydrophobic residues to form water-soluble β-sheets was investigated by CD.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360231112
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  • 5
    Electronic Resource
    Electronic Resource
    XPS and SIMS studies of amino groups electrochemically grafted on carbon fibre surfaces (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 16 (1990), S. 336-337 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740160172
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  • 6
    Electronic Resource
    Electronic Resource
    Contribution à l'etude de la cinétique de formation de polymères séquencés par voie radicalaire (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 1969-1984 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to study some aspects of radical polymerization initiated by a polymer, hexanediol sebacates in different degrees of polymerization were prepared. The endgroup was the tert-butyl perester which was used to polymerize the styrene. With such compounds, it is easy after the polymerization to take off the polyester backbone by hydrolysis. One can then study the mixture of polystyrene sequences and homopolystyrene made at the same time. It appears that if the speed of thermal decomposition of the tert-butyl perester group on the polyester is of the same order as that of the tert-butyl perbenzoate, the efficiency factor, i.e., the fraction of free radicals which effectively initiates the polymerization, is much smaller with a polymeric initiator. Moreover, the average degree of polymerization is much smaller in this case (even in the presence of a nonperoxidized polyester). It is believed that these two results can be explained by assuming each polyester backbone to act as a cage for the free radicals produced by its own perester group which aids their recombination and intramolecular transfer.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030526
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  • 7
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    The Energetic Trans-Iron Composition Experiment (ENTICE) on the Heavy Nuclei Explorer (HNX) Mission (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The ENTICE experiment is one of two instruments that make up the HNX mission. The experimental goal of ENTICE is to measure with high precision the elemental abundances of all nuclei with Z between 10 and 82. This will enable us to determine if the injection mechanism for the cosmic ray accelerator is controlled by FIP or Volatility and to study the mix of nucleosynthetic processes that contribute to the galactic cosmic ray source. The ENTICE experiment utilizes the dE/dx-C method of charge determination and consists of silicon dE/dx detectors, Cherenkov detectors with two different refractive indices, and a fiber hodoscope. We will describe the instrument and its performance based on beam tests of a prototype instrument.
    Keywords: Space Radiation
    Type: ICRC 2001 Conference; Aug 07, 2001 - Aug 15, 2001; Hamburg; Germany
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    NASA TECHNICAL REPORTS
  • 8
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    ECCO: Th/U/Pu/Cm Dating of Galactic Cosmic Ray Nuclei (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The ECCO (Extremely-heavy Cosmic-ray Composition Observer) instrument is one of two instruments which comprise the HNX (Heavy Nuclei Explorer) mission. The principal goal of ECCO is to measure the age of galactic cosmic ray nuclei using the actinides (Th, U, Pu, Cm) as clocks. As a bonus, ECCO will search with unprecedented sensitivity for long-lived elements in the superheavy island of stability. ECCO is an enormous array (23 sq. m) of BP-1 glass track-etch detectors, and is based on the successful flight heritage of the Trek detector which was deployed externally on Mir. We present a description of the instrument, estimates of expected performance, and recent calibrations which demonstrate that the actinides can be resolved from each other with good charge resolution.
    Keywords: Space Radiation
    Type: ICRC 2001 Conference; Aug 07, 2001 - Aug 15, 2001; Hamburg; Germany
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    NASA TECHNICAL REPORTS
  • 9
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    The Heavy Nuclei eXplorer (HNX) Mission (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The primary scientific objectives of HNX, which was recently selected by NASA for a Small Explorer (SMEX) Mission Concept Study, are to measure the age of the galactic cosmic rays (GCR) since nucleosynthesis, determine the injection mechanism for the GCR accelerator (Volatility or FIP), and study the mix of nucleosynthetic processes that contribute to the source of GCRs. The experimental goal of HNX is to measure the elemental abundances of all individual stable nuclei from neon through the actinides and possibly beyond. HNX is composed of two instruments: ECCO, which measures elemental abundances of nuclei with Z greater than or equal to 72, and ENTICE. which measures elemental abundances of nuclei with Z between 10 and 82. We describe the mission and the science that can be addressed by HNX.
    Keywords: Space Radiation
    Type: 27th ICRC 2001 Conference; Aug 07, 2001 - Aug 15, 2001; Hamburg; Germany
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    NASA TECHNICAL REPORTS
  • 10
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    The Energetic Trans-Iron Composition Experiment (ENTICE) on the Heavy Nuclei Explorer (HNX) (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The ENTICE experiment is one of two instruments which make up the HNX mission. The experimental goal of ENTICE is to measure with high precision the elemental abundances of all nuclei with 10〈=Z〈=82. This will enable us to distinguish between possible injection mechanisms for the galactic cosmic ray accelerator such-as those dependent upon volatility or first ionization potential, and to study the mix of nucleosynthetic processes that contribute to the galactic cosmic ray source. The ENTICE experiment utilizes the dE/dx-C method of charge determination and consists of silicon dE/dx detectors, Cherenkov detectors with two different refractive indices, and a scintillating fiber hodoscope. The geometrical factor of the instrument is 8m2.sr. We will present a description of the instrument and its expected performance based on beam tests and a balloon flight of a prototype instrument.
    Keywords: Space Radiation
    Type: International Cosmic Ray Conference; Aug 07, 2001 - Aug 15, 2001; Hamburg; Germany
    Format: text
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    NASA TECHNICAL REPORTS
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