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  • 1
    Electronic Resource
    Electronic Resource
    Carboxymethylation of cellulose in unconventional media (1999)
    Springer
    Cellulose 6 (1999), S. 153-165 
    Details
    ISSN: 1572-882X
    Keywords: cellulose functionalisation ; carboxymethyl cellulose ; cellulose solvents ; homogeneous procedure ; reactive microstructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Carboxymethylation of cellulose in the new and highly efficient aqueous solvent Ni(tren)(OH)2, [tren=tris(2‐aminoethyl)amine] and in melts of LiClO4· 3H2O or N‐methyl‐morpholine‐N‐oxide (NMMNO), which is now widely applied for cellulose fibre production, was investigated. In case of Ni(tren)(OH)2, a totally homogeneous carboxymethylation of cellulose with sodium monochloroacetate, in the presence of an aqueous NaOH solution is possible for the first time. Structure analysis by means of HPLC and 1 H‐NMR after chain degradation showed results comparable with findings for CMC obtained by the heterogeneous slurry process, that is, a statistic distribution of substituents along the polymer chain and functionalisation of the hydroxyl groups in the order C‐6 ≥ C‐2 〉 C‐3. The etherification of cellulose in a melt of LiClO4· 3H2O, a new type of cellulose solvent, was shown to be possible and gave products of a statistic functionalisation pattern as well. In contrast, carboxymethylation starting from solutions of cellulose in NMMNO initiated with solid NaOH particles yields polymers with a nonstatistic distribution of functional groups along the chain, as observed for cellulose ethers prepared in reactive microstrctures starting from solutions of cellulose intermediates in dimethyl sulfoxide as well as of unmodified cellulose dissolved in N,N‐dimethyl acetamide/LiCl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009271427760
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  • 2
    Electronic Resource
    Electronic Resource
    Modified Bipyridines: 5,5′-Diamino-2,2′-bipyridine Metal Complexes Assembled into Multidimensional Networks via Hydrogen Bonding and π-π Stacking Interactions (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1507-1521 
    Details
    ISSN: 1434-1948
    Keywords: 2,2′-Bipyridines ; Chelate complexes ; Hydrogen bonding ; π-π stacking ; Crystal structure ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new synthetic route for the synthesis of 5,5′-diamino-2,2-bipyridine (5) based on the coupling of 2-chloro-5-aminopyridine in the presence of NiCl2 × 6 H2O/PPh3/Zn in dimethylformamide is described. The reactions of the potentially ambidentate ligand 5 with salts of the transition metals Mn, Fe, Ni, Cu, Zn, Ag, and Cd gave a variety of 13 metal-ligand complexes depending on the anion, the crystallization conditions and the metal-to-ligand ratio. The complexes obtained were characterized by thermal analyses, NMR including 113Cd-NMR, IR, and for the iron complex 57Fe-Mößbauer spectroscopy. The structure of eight of the compounds was elucidated by X-ray crystallography. All of these metal complexes show a bipyridine-metal coordination. The amino functionality was never involved in metal coordination. The intermolecular arrangement is dictated by hydrogen bonding from the amino functionality and by π-π stacking of the bipyridine rings.Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/1999/99078_s.pdf or from the author.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Homoleptic Cuprates(II) with Multiply Deprotonated α-Cyclodextrin LigandsPolyol metal complexes, part 22. Part 21: J. Burger, P. Klüfers, Angew. Chem. Int. Ed. Engl. 1997, 36, Issue 7. (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 601-608 
    Details
    ISSN: 0947-6539
    Keywords: copper ; cuprates ; cyclodextrins ; structure elucidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the presence of cupric ions, α-cyclodextrin (α-CD) is multiply deprotonated in alkaline aqueous solution. With lithium or sodium as the counterions, trinuclear sandwich-type cuprate ions of the formula [Cu3(α-CDH_6)2]6- are formed (1 and 2), whereas dinuclear [Cu2(α-CDH_4)2]4- ions are isolated in the form of the potassium (3a) and the rubidium salts (3b). The structures of the cyclodextrinatocuprate ions resemble cylinders, since the usual conical shape of a cyclodextrin is altered due to the formation of shorter hydrogen bonds on the O2/O3 rim of the α-cyclodextrin torus. Despite anion formation, the cavity of the cyclodextrin is still hydrophobic, giving rise to the intercalation of acetone guests in 2 and 3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030416
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung von (η6-Aren)2Cr2(CO)3-Komplexen mit einer formalen Cr ≡ Cr-Dreifachbindung aus η6-ArenCr(CO)2NCCH3 (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1825-1835 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of (η6-arene)2Cr2(CO)3 Complexes Containing a Formal Cr ≡ Cr Triple Bond Starting from η6-areneCr(CO)2NCCH3The photochemical reaction of η6-ArCr(CO)3 (Ar = benzene, toluene, m-xylene, mesitylene, methyl benzoate, and fluorobenzene) with acetonitrile in hexane or p-tolunitrile in THF, resp., yields complexes η6-ArCr(CO)2NCR (1 - 10). Solutions of the red acetonitrile complexes yield on warming or UV photolysis by dissoziation of the nitrile and one CO ligand in the presence of benzene the new black coordination compounds (η6-Ar)2Cr2(CO)3 (11 - 16). The spectra and an X-ray structure determination of the benzene derivative 11 verify a Cr2-unit with a formal triple bond bridged by three CO ligands. The asymmetric unit of 11 contains two halves of molecules with Cr — Cr distances of 222.6 and 221.6 pm.
    Notes: Bei der photochemischen Umsetzung von η6-ArCr(CO)3 (Ar = Benzol, Toluol, m-Xylol, Mesitylen, Benzoesäure-methylester und Fluorbenzol) mit Acetonitril in Hexan bzw. p-Tolunitril in THF entstehen Komplexe η6-ArCr(CO)2NCR (1-10). Lösungen der roten Acetonitrilkomplexe bilden in der Wärme oder bei UV-Bestrahlung unter Abspaltung des Nitril- und eines CO-Liganden in Gegenwart von Benzol die neuen schwarzen Komplexe (η6-Ar)2Cr2(CO)3 (11-16). Die Spektren und die Röntgenstrukturanalyse des Benzolderivats 11 belegen eine von drei CO-Liganden verbrückte, formal eine Dreifachbindung aufweisende Cr2-Einheit. Die asymmetrische Enheit von 11 enthält zwei Molekülhälften mit Cr — Cr-Abständen von 222.6 bzw. 221.6 pm.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180509
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  • 5
    Electronic Resource
    Electronic Resource
    Zweifach Dialkylchalkogenid-verbrückte Carbonylzweikernkomplexe von Chrom, Molybdän und Wolfram (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4224-4228 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bifold Dialkyl Chalcogenide-bridged Dinuclear Carbonyl Complexes of Chromium, Molybdenum, and TungstenThe dinuclear complexes [M(CO)4(μ-SEt2)]2 (M = Cr, Mo; 1a, b), [Cr(CO)4(μ-SeEt2)]2 (2), and [M(CO)4(μ-SMe2)]2 (M = Cr, W; 3a, b) are formed besides CO on irradiation of solutions of the corresponding mononuclear pentacarbonyl complexes M(CO)5(ER2). The new compounds were characterized spectroscopically, the molecular geometry of 1a was established by an X-ray analysis.
    Notes: Die Zweikernkomplexe [M(CO)4(μ-SEt2)]2(M = Cr, Mo; 1a, b), [Cr(CO)4(μ-SeEt2)]2 (2) und [M(CO)4(μ-SMe2)]2 (M = Cr, W; 3a, b) entstehen neben CO beim Bestrahlen von Lösungen der entsprechenden einkernigen Pentacarbonylkomplexe M(CO)5(ER2). Der aus spektroskopischen Daten ermittelte Molekülaufbau wird für 1a durch eine Einkristallröntgenstrukturanalyse gesichert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181028
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  • 6
    Electronic Resource
    Electronic Resource
    Heteronucleare Komplexe mit CuCo(CO)4-Baueinheiten und StickstoffligandenHeteronukleare Komplexverbindungen mit Metall-Metall-Bindungen, 4. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert.  -  3. Mitteilung [1a].Professor Hans-Uwe Schuster zum 60. Geburtstag gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 102 (1990), S. 825-826 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19901020725
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  • 7
    Electronic Resource
    Electronic Resource
    Sechzehnfach deprotonierte γ-Cyclodextrin-Tori als Anionen in einem sechzehnkernigen Blei(II)-alkoxidPolyol-Metall-Komplexe, 11. Mitteilung. Diese Arbeit wurde vom Bundesministerium für Forschung und Technologie (Förderkennzeichen 0319368A), der Akzo AG, Wuppertal, und der Wacker-Chemie, München (Cyclodextrinspende), gefördert. - 10. Mitteilung: [5]. (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 106 (1994), S. 1925-1927 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19941061811
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  • 8
    Electronic Resource
    Electronic Resource
    Heteronukleare Komplexverbindungen mit Metall - Metall-Bindungen. IX [1]. Amin-kupfer(I)-carbonylmetallate mit Cobalt, Eisen oder Mangan (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1365-1373 
    Details
    ISSN: 0044-2313
    Keywords: Heteronuclear Metal Complexes ; Metal - Metal Bonds ; Copper ; Carbonyl cobaltate ; Carbonyl manganate ; Nitrosyl carbonyl ferrate ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heteronuclear Coordination Compounds with Metal - Metal Bonds. IX. Amine Copper(I) Carbonyl Metalates with Cobalt, Iron, or ManganeseColourless crystals of the carbonyl copper complex [(NH3)3(CO)Cu][Co(CO)4] (1 a) are formed in the reaction of [Cu(NH3)4]Cl and Na[Co(CO)4] (T 〈 - 8°C, pCO = 1 bar); above -5°C and under N2-atmosphere 1 a converts to [(NH3)2CuCo(CO)4] (C), which serves as a starting material for the synthesis of new copper cobaltates: the amines N-amino piperidine, N,N-dimethyl ethylenediamine (dmed) and N-benzyl N,N′-dimethyl ethylenediamine (bn-dmed) replace NH3 to form [(C5H10N—NH2)3CuCo(CO)4] (1 b), [(dmed)CuCo(CO)4] (1 c), [(bn-dmed)CuCo(CO)4] (1 d) the Cu—Co-bond remaining intact. [(NH3)2CuFe(CO)3NO] (2 a) is isosteric with C; it is synthesized from [Cu(NH3)4]Cl and Na[Fe(CO)3NO] in aqueous solution; 2 a reacts with N,N,N′,N′-tetramethyl ethylenediamine (tmed) to form [(tmed)(NH3)CuFe(CO)3NO] (2b). The [Mn(CO)5]- ion reacts with ammine copper ions to form the tetranuclear cluster [{(NH3)CuMn(CO)5}2] (3). All new compounds have been investigated by X-ray structure analysis.
    Notes: Farblose Ionenkristalle des Carbonyl-kupfer-Komplexes [(NH3)3(CO)Cu][Co(CO)4] (1 a) entstehen bei der Reaktion von [Cu(NH3)4]Cl und Na[Co(CO)4] (T 〈 - 8°C, 1 bar CO-Druck); oberhalb -5°C und unter N2-Atmosphäre entsteht aus 1 a [(NH3)2CuCo(CO)4] (C), von dem ausgehend weitere Cobaltate zugänglich sind: Die Amine N-Amino-piperidin, N,N-Dimethyl-ethylendiamin (dmed) und N-Benzyl-N′,N′-dimethyl-ethylendiamin (bn-dmed) verdrängen NH3 unter Erhalt der Cu—Co-Bindung zu [(C5H10N—NH2)3CuCo(CO)4] (1 b), [(dmed)CuCo(CO)4] (1 c), [(bn-dmed)CuCo(CO)4] (1 d). Das zu C isostere [(NH3)2CuFe(CO)3NO] (2 a) entsteht bei der Reaktion von [Cu(NH3)4]Cl und Na[Fe(CO)3NO] in wäßriger Lösung; mit N,N,N′,N′-Tetramethylethylendiamin (tmed) wird aus 2 a [(tmed)(NH3)CuFe(CO)3NO] (2 b) erhalten. Mit dem [Mn(CO)5]--Ion bildet sich dagegen unter den für 2 a angegebenen Reaktionsbedingungen der ammoniakärmere, heteronukleare Vierkerncluster [{(NH3)CuMn(CO)5}2] (3). Alle neuen Verbindungen sind durch Einkristallstrukturanalyse gesichert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220815
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  • 9
    Electronic Resource
    Electronic Resource
    Polyol-Metall-Komplexe. X. Blei(II)-meso-oxolan-3,4-diolat(2-)-Monohydrat - ein polymeres Blei-alkoxid aus wäßriger Lösung (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 19-22 
    Details
    ISSN: 0044-2313
    Keywords: Lead ; meso-Oxolane-3,4-diolate(2-) ; Anhydroerythritol ; Coordination Polymer ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyol Metal Complexes. X. Lead(II) meso-Oxolane-3,4-diolate(2-) Monohydrate - a Polymeric Lead Alkoxide from Aqueous SolutionIn the colourless crystals of Pb(C4H6O3) · H2O (P21/c, a = 569.8(3), b = 607.6(4), c = 1856.9(9) pm, β = 89.90(4)°, V = 642.9(6) · 106 pm3, Z = 4), lead(II)- and meso-oxolane-3,4-diolate(2-) ions form a one-dimensional coordination polymer; PbII is coordinated with four bridging alkoxide O-atoms (mean distance: 234.5 pm); some 100 pm more distant two μ-O-atoms of water molecules coordinate the lead ion.
    Notes: Blei(II)- und meso-Oxolan-3,4-diolat(2-)-Ionen bauen in den farblosen Kristallen von Pb(C4H6O3) · H2O (P21/c, a = 569,8(3), b = 607,6(4), c = 1856,9(9) pm, β = 89,90(4)°, V = 642,9(6) · 106 pm3, Z = 4) ein kettenförmiges Koordinationspolymer auf, in dem PbII von vier verbrückenden Alkoxid-O-Atomen koordiniert ist (mittlerer Abstand: 234,5 pm); ungefähr 100 pm weiter entfernt koordinieren zwei ebenfalls verbrückende Wasser-O-Atome.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210106
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  • 10
    Electronic Resource
    Electronic Resource
    Polyol-Komplexe. VIII. R,R-trans-1,2-Diaminocyclohexan-κN,N′-(methyl-β-D-xylopyranosid-2,3-ato-κO2,O3)-aqua-kupfer-Dihydrat, [(R,R-chxn)(H2O)Cu(Me-β-D-Xylp2,3 H-2)] · 2 H2O,  -  ein Kupferkomplex mit einem doppelt deprotonierten D-Xylosederivat als Ligand (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1631-1634 
    Details
    ISSN: 0044-2313
    Keywords: Polyolato-copper complex ; Deprotonated methyl β-D-xylopyranoside ; Crystal structure ; Hydrogen bond structure ; Homodromic helix ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyol Metal Complexes. VIII. R,R-trans-Diaminocyclohexane-κN,N′ Methyl-β-D-xylopyranosid-2,3-ato-κO2,O3 Aqua Copper Dihydrate, [(R,R-chxn)(H2O)Cu(Me-β-D-Xylp2,3 H-2)] · 2 H2O,  -  a Copper Complex with a Twofold Deprotonated Xylose Derivative as a LigandMethyl β-D-xylopyranoside forms a chelate complex with copper(II) ions in aqueous, alkaline solution after deprotonation at O-2 and O-3. In the blue crystals, CuII is further coordinated by R,R-trans-1,2-diaminocyclohexane and water; P21, a = 982.9(3), b = 705.8(5), c = 1 292.1(6) pm, β = 96.74(4)°, V = 890.2(8) · 106 pm3. The alkoxide-O-atoms act as acceptors in a hydrogen bond system, a typical feature of which is a homodromic helix of water molecules.
    Notes: Methyl-β-D-xylopyranosid bildet in wäßrig-alkalischer Lösung einen Chelatkomplex mit Kupfer(II), in dem es an O-2 und O-3 deprotoniert als Diolat-Ligand vorliegt. In den blauen Kristallen ist CuII außerdem von R,R-trans-1,2-Diaminocyclohexan und Wasser koordiniert; P21, a = 982,9(3), b = 705,8(5), c = 1 292,1(6) pm, β = 96,74(4)°, V = 890,2(8) · 106 pm3. Die Alkoxid-O-Atome sind Akzeptoren in einem Wasserstoffbrückenbindungssystem, dessen auffälliges Merkmal eine homodrome Schraube von Wassermolekülen ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200923
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