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  • 1
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract C60 chemically modified poly(N-vinyl-chloromethylcarbazole) was synthesized by the reaction of C60 with living poly(N-vinyl-chloromethylcarbazole) (PVCC) carbanions, which were prepared by α-position proton abstraction with NaH. The structural characterization techniques used were ultraviolet–visible, Fourier transform-infrared spectroscopy, X-ray diffraction, scanning electron microscopy, nuclear magnetic resonance and electron spin resonance, etc. All experimental results proved that C60 was covalently attached on the backbone chain of PVCC and consequently causes a remarkable enhancement of the photoconductivity of the parent polymer. Also, it was found that fullerenation of PVCC modified both the electronic structures of the carbazole pendant group and the interchain structure. © 1998 Chapman and Hall
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  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, LXVIII. Synthesis and Structure of Novel Binuclear Biscarbyne Complexes of Chromium, Molybdenum, and Tungsten with Bridging Phenylthio-, Arylseleno-, Halogeno-, and Pseudohalogeno LigandsPentacarbonyl[(diethylamino)(ethoxy)carbene]molybdenum (1) reacts with boron trifluoride to give a very unstable product which is supposed to be pentacarbonyl[(diethylamino)carbyne]-molybdenum tetrafluoroborate (2). Low temperature reaction of 2 with bromide, iodide, and thiocyanate yields the neutral trans-substituted carbyne complexes trans-X(CO)4MoCNEt2 (4a-c) [X = Br (a), I (b), SCN (c)] cyanate and 4-(trifluoromethyl)phenylselenolate afford the compounds (μ-X)2[(CO)3MoCNEt2]2 (5d, f) [X = OCN (d), 4-CF3C6H4Se (f)] which are members of a new class of binuclear biscarbyne complexes. Analogues 5a-c, g-l are prepared from the carbyne complexes trans-X(CO)4MCNR2 (4a-c, g-l) on warming in solution. The corresponding complex 5e (X = N3, M = W, R = C2H5) is obtained by the reaction of pentacarbonyl[(diethylamino)carbyne]tungsten tetrafluoroborate (6) with azide. The structures of 5b, d, e, g are ensured by X-ray analyses.
    Notes: Pentacarbonyl[(diethylamino)(ethoxy)carben]molybdän (1) reagiert mit Bortrifluorid zu einem sehr instabilen Produkt, bei dem es sich vermutlich um Pentacarbonyl[(diethylamino)carbin]-molybdän-tetrafluroborat (2) handelt. Wird 2 bei tiefer Temperatur mit Bromid, Iodid und Thiocyanat umgesetzt, erhält man die neutralen trans-substituierten Carbinkomplexe trans-X(CO)4MoCNEt2 (4a-c) [X = Br (a), I (b), SCN (c)] demgegenüber ergeben Cyanat und 4-(Trifluormethyl)phenylselenolat die Verbindungen (μ-X)2[(CO)3MoCNEt2]2 (5d, f) [X = OCN (d), 4-CF3C6H4Se (f)] als Vertreter einer neuen Klasse von zweikernigen Biscarbin-Komplexen. Die dazu analogen Verbindungen 5a-c, g--l werden dargestellt, indem man die Carbinkomplexe trans-X(CO)4MCNR2 (4a-c, g-l) in Lösung aufwärmt. Der entsprechende Komplex 5e (X = N3, M = W, R = C2H5) wird bei der Umsetzung von Pentacarbonyl[(diethylamino)carbin]-wolfram-tetrafluoroborat (6) mit Azid erhalten. Der Aufbau von 5b, d, e, g ist durch Röntgenstrukturanalysen gesichert.
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, CXXVII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, XI11 2. Diethylamino(phenyltel1uro)carbene- and Diethylaminocarbyne(phenyltelluro) Complexes of Chromium: Preparative Investigations and Kinetics of the C, Cr-Migration of PhTePentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (1), reacts with lithium tellurophenolate, Li[TePh], with addition of the tellurophenolate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(phenyltelluro)carbene]chromium, (CO)5Cr[C(TePh)NEt2] (2). On heating in solution, the complex 2 rearranges with CO-elimination and C, Cr-migration of TePh to give trans-tetracarbonyl(diethylaminocarbyne)(phenyltelluro)chromium, trans-(PhTe)(CO)4CrCNEt2 (3). The rearrangement follows a first order rate law (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = 42 ± 4 Jmol-1K-1; in 1,1,2-trichloroethane). In solution, 3 dimerizes with CO-elimination to give bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbyne)chromium], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Addition of PPh3 to solutions of 2 does not influence the rate of the rearrangement but leads to a different product, mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (1), reagiert mit Lithium-tellurophenolat, Li[TePh], unter Addition des Tellurophenolat-Anions an das Carbin-kohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(phenyltelluro)carben]chrom, (CO)5Cr[C(TePh)NEt2] (2). Beim Erwärmen in Lösung lagert sich der Komplex 2 unter CO-Abspaltung und C, Cr-Wanderung von TePh nach einem Geschwindigkeitsgesetz erster Ordnung (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = Jmol-1K-1; in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl(diethylaminocarbin)(phenyltelluro)chrom, trans-(PhTe)(CO)4-CrCNEt2 (3), um. In Lösung dimerisiert 3 unter CO-Eliminierung zu Bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbin)chrom], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Zusatz von PPh3 zu Lösungen von 2 beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, liefert jedoch als Reaktionsprodukt mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, CXVIII1) Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, VIII2) C, Cr-Migration of SeR in (CO)5Cr[C(SeR)NEt2]: Kinetic, Mechanistic and Preparative InvestigationsOn heating in solution, [(arylseleno)(diethylamino)carbene]pentacarbonylchromium complexes, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] rearrange with CO-elimination and C, Cr-migration of SeR to form the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne) chromium complexes, trans-RSe(CO)4CrCNEt2, (3a-g). The rearrangement follows a first-order rate law. Free carbon monoxide does not influence the reaction rate whereas the Polarity of the solvent and the type of the substituent R only influence the rate of the reaction to a very small extent. The activation enthalpies are ΔH≠ = 101-104 kj mol-1, the activation entropies ΔS = 27-33 j mol-1 K-1. Addition of PPh3 to solutions of 2d does not influence the rate of the rearrangement but leads to a different reaction product, mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d). Complex (4d). is also formed by photolysis of 2d in the presence of PPh3, The compounds 3a - d and 4d are characterized by analytical and spectroscopic means, 3c, additionally by an X-ray analysis.
    Notes: Beim Erwärmen in Lösung lagern sich die [(Arylseleno)(diethylamino)carben]pentacarbonyl-chrom-Komplexe, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4 (c_, C6H4 (d), 4-C6H4OCH3 (e) 4-C6H4OCH3 (f), 1-C10H7 (g)] unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)-chrom-Komplexen, trans-RSe(CO)4CrCNEt2, (3a-g) nach einem Geschwindigkeitsgesetz erster Ordnung um. Freies Kohlenmonoxid ist ohne, die Polarität des Solvens sowie die Art des Substituenten R sind nur von geringem Einfluß auf die Reaktionsgeschwindigkeit. Die Aktivierungsenthalpien betragen ΔH≠ = 101 104 kj mol-1, die Aktivierungsentropien ΔS≠ = 27-33 j mol-1 K-1. Zusatz von PPh3 zu Lösungen von 2d beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, man erhält jedoch mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d) als Reaktionsprodukt. Photolyse von 2d in THF in Anwesenheit von PPh3 liefert ebenfalls 4d. Die Verbindungen 3a-d und 4d wurden analytisch und spektroskopisch gesichert, 3c zusätzlich durch eine Röntgenstrukturanalyse.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 84-89 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pentacarbonyl[(diethylamino)carbyne]tungsten tetrachloroborate [(CO)5WCNEt2]BCl4 (2) reacts with lithium arylselenolate LiSeR (3) [R = C6H5 (a), 4-FC6H4 (b), 4-CF3C6H4 (c)] with CO-elimination to give the corresponding trans-(arylseleno)tetracarbonyl[(diethylamino)carbyne]-tungsten(0) complexes trans-(RSe)(CO)4WCNEt2 (4a-c). The expected formation of [(arylseleno)(diethylamino)carbene]pentacarbonyltungsten(0) (CO)5W[C(SeR)NEt2] (6) by nucleophilic addition of the selenolate anion to the carbyne carbon atom of 2 was found only in the case of c. Contrary to the corresponding chromium compound, 6c on heating in solution does not rearrange with CO-elimination and C,W-migration of SeR to give 4c. The complexes 4 are also formed by nucleophilic substitution of the halogeno ligand in trans-Cl(CO)4WCNEt2 (5) by arylselenolate.
    Notes: Pentacarbonyl[(diethylamino)carbin]wolfram-tetrachloroborat [(CO)5WCNEt2]BCl4 (2) reagiert mit Lithiumarylselenolat LiSeR (3) [R = C6H5 (a), 4-FC6H4 (b), 4-CF3C6H4 (c)] unter CO-Abspaltung zu den entsprechenden trans-(Arylseleno)tetracarbonyl[(diethylamino)carbin]wolfram(0)-Komplexen trans-(RSe)(CO)4WCNEt2 (4a-c). Das durch nucleophile Addition des Selenolat-Anions an das Carbinkohlenstoffatom von 2 zu erwartende [(Arylseleno)(diethylamino)carben]pentacarbonylwolfram(0) (CO)5W[C(SeR)NEt2] (6)wurde nur im Fall c gefunden. Im Gegensatz zur entsprechenden Chrom-Verbindung lagert sich 6c beim Erwärmen in Lösung nicht unter CO-Abspaltung und C,W-Wanderung von SeR in 4c um. Nucleophile Substitution des Halogenoliganden in trans-Cl(CO)4WCNEt2 (5) durch Arylselenolat liefert ebenfalls 4.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3209-3219 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, CXVII1) [(Arylseleno)(diethylamino)carbene]pentacarbonylchromium(0)Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [CO)5CrCNEt2]BF4, (1) reacts with lithium arylselenolate, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] with addition of the selenolate anion to the carbyne carbon atom to give [(arylseleno)(diethylamino)carbene]pentacarbonylchromium(0), (CO)5Cr[C(SeR)NEt2], (4a - g). The complexes 4 were characterized by elemental analyses, spectroscopic data and in the case fo 4d additionally by an X-ray analysis. On heating in solution, 4a - g rearrange with CO-elimination and C,Cr-migration of SeR to the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne)chromium complexes, trans-RSe(CO)4-CrCNEt2, (5a - g).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4, (1) reagiert mit Lithium -arylselenolat, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4 (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] unter Addition des Selenolat-Anions an das Carbinkohlenstoffatom und Bildung von [Arylseleno)(diethylamino)carben]pentacarbonylchrom(0), (CO)5Cr[C(SeR)NEt2], (4a-g). Die Komplexe 4 wurden elementaranalytisch, spektroskopisch sowie im Fall von 4d zusätzlich durch eine Röntgenstrukturanalyse gesichert. Beim Erwärmen in Lösung lagern sich 4a-g unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)chrom-Komplexen, trans-RSe(CO)4(CrCNEt2, (5a-g) um.
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  • 9
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, CXXII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reaction, XII. Pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium and trans-Tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium: Preparative Investigations and Kinetics of the C,Cr-Migration of PbPh3Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (2), reacts with lithium triphenylplumbate, LiPbPh3 (3), with addition of the plumbate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium, (CO)5-Cr[C(PbPh3)NEt2] (4). Already at room temperature, the complex 4 rearranges with CO-elimination and C,Cr-migration of PbPh3 to give trans-tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium, trans-(Ph3Pb)(CO)4CrNEt2 (5). The rearrangement follows a first-order rate law (ΔH≠ = 103 kJmol-1; ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-trichloroethane). The compounds 4 und 5 were characterized by analytical and spectroscopic means.
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (2), reagiert mit Lithium-triphenylplumbat, LiPbPh3 (3), unter Addition des Plumbat-Anions an das Carbinkohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(triphenylplumbyl)carben]chrom, (CO)5Cr[C(PbPh3)NEt2] (4). Bereits bei Raumtemperatur lagert sich der Komplex 4 unter CO-Abspaltung und C,Cr-Wanderung von PbPh3 nach einem Geschwindigkeitsgesetz erster Ordnung (ΔH≠ = 103 kJmol-1, ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl-(diethylaminocarbin)(triphenylplumbyl)chrom, trans-(Ph3Pb)(CO)4CrCNEt2 (5), um. Die Verbindungen 4 und 5 wurden analytisch und spektroskopisch gesichert.
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  • 10
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 2653-2663 
    ISSN: 0887-6266
    Keywords: [60]fullerene ; styrene ; anionic copolymerization ; structural characterization ; sodium naphthalene ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The novel C60-styrene copolymers with different C60 contents were prepared in sodium naphthalene-initiated anionic polymerization reactions. Like the pure polystyrene, these copolymers exhibited the high solvency in many common organic solvents, even for the copolymer with high C60 content. In the polymerization process of C60 with styrene an important side reaction, i.e., reaction of C60 with sodium naphthalene, would occur simultaneously, whereas crosslinking reaction may be negligible. 13C-NMR results provided an evidence that C60 was incorporated covalently into the polystyrene backbone. In contrast to pure polystyrene, the TGA spectrum of copolymer containing ∼ 13% of C60 shows two plateaus. The polystyrene chain segment in copolymer decomposed first at 300-400°C. Then the fullerene units reptured from the corresponding polystyrene fragments attached directly to the C60 cores at 500-638°C. XRD evidence indicates that the degree of order of polymers increases with the fullerene content increased in terms of crystallography. Incorporation of C60 into polystyrene results in the formation of new crystal gratings or crystallization phases. In addition, it was also found that [60]fullerene and its polyanion salts [C60n-(M+)n, M = Li, Na] cannot be used to initiate the anionic polymerization of some monomers such as acrylonitrile and styrene, etc.© 1998 John Wiley & Sons, Inc. J. Polym. Sci. B Polym. Phys. 36: 2653-2663, 1998
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