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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and properties of new π-conjugated polyquinoxalines with aromatic fused rings in the side chain (2000)
    Springer
    Polymer bulletin 44 (2000), S. 231-238 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New π-conjugated polyquinoxalines with aromatic fused rings in their side chain have been prepared. Dehalogenative organometallic polycondensation of 5,8-dibromo[2,3-b]-acenaphthenequinoxaline and 5,8-dibromo[2,3-b]phenanthrenequinoxaline with a zerovalent nickel complex afforded poly([2,3-b]acenaphthenequinoxaline-5,8-diyl) (P(5,8-Qx(ace))) and poly([2,3-b]phenanthrenequinoxaline-5-8-diyl) (P(5,8-Qx(phen))) in high yields. P(5, 8-Qx(ace)) had an [η] value of 0.23 dL g−1 and showed absorption and photoluminescence peaks at 445 and 565 nm, respectively. (P(5,8-Qx(phen))) gave absorption and photoluminescence peaks at 400 and 514 nm, respectively. XRD data indicated formation of ordered structures of the polymers in the solid. Preparation of related copolymer with thiophene is also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050597
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of polyurea rotaxanes using a cyclodextrin complex of α,ω-diamine (2000)
    Springer
    Polymer bulletin 44 (2000), S. 247-253 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyaddition of α-cyclodextrin (α-CD) inclusion complex of ethylene glycol bis(2-aminoethyl)ether with 4,4'-methylenebis(1-isocyanatobenzene) (MDI) provided a pseudopolyrotaxane. Similar reactions of α-CD inclusion complex of poly(tetrahydrofuran) terminated with 3-aminopropyl groups with MDI and with 1-methyl-2,4-phenylene diisocyanate gave polyurea pseudorotaxane and polyrotaxane, respectively. The 1H NMR spectrum indicates that molar ratios of α-CD to the polyurea chain in polyrotaxanes are 55, 24, and 45%, respectively. Formation of the rotaxane structure was confirmed by X-ray diffraction analysis and GPC measurement. DSC measurement indicates that they show higher glass transition temperature than that of the corresponding CD free polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050599
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Poly(pyridine-2,5-diyl)–CuCl2 catalyst for synthesis of dimethyl carbonate by oxidative carbonylation of methanol: catalytic activity and corrosion influence (2000)
    Springer
    Catalysis letters 65 (2000), S. 123-126 
    Details
    ISSN: 1572-879X
    Keywords: dimethyl carbonate (DMC) ; oxidative carbonylation ; CuCl2 immobilization ; corrosion resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A π-conjugated polymer, poly(pyridine-2,5-diyl) (PPy) was investigated as a support for CuCl2 in the synthesis of dimethyl carbonate by oxidative carbonylation of methanol. The PPy–CuCl2 adduct had high catalytic activity which was comparable to that of the homogeneous CuCl2 catalyst. The adduct caused corrosion of stainless-steel vessels only to minor extent, compared with the homogeneous CuCl2 catalyst. This PPy–CuCl2 catalyst was easily recycled by filtration and showed a similar catalytic activity in the third time use. The presence of the π-conjugated system in PPy, through which electrons can move, may bring about the high catalytic activity for the oxidative carbonylation of methanol, which involves Cu(II)/Cu(I) redox processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019033725260
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    Paper (German National Licenses)
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