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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 199 (1980), S. C27-C30 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 218 (1981), S. C1-C4 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 3
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nickel(O) Complexes with the Anionic Ligands E (C6H5)-3 (E = Si, Ge, Sn)Complexes of the type MeIXNi(EPH3)X(THF)Y are formed from Ni(COD)2 by substitution with MeIEPh3 (E = Si, Ge, Sn) in THF (COD = Cyclooctadiene-1,5). In the case of the ligands GePh-3 and SnPh-3 nickel(O) is fourfold coordinated, but in the case of SiPh-3 it is only two-fold or threefold coordinated. Products of the reaction between Ni(COD)2 and LiPbPh3 are Li2Ni(COD)Ph2(THF)5 and Ph3PbPbPh3.The 1H-n.m.r., 29Si-n.m.r., and 119Sn-Mössbauer spectra of the complexes MeIXNi(EPh3)X(THF)Y are compared with the spectra of the corresponding alkali compounds MeIEPh3. The magnetic anisotropy effects of the atomes Ge, Sn, Pb and Ni are of high importance for 1H- and 29Si-chemical shifts. The donor action of SnPh-3 is shown by the Mössbauer spectrum of Na4Ni(SnPh3)4(THF)4. But there is no direct evidence of π-back donation in the compound.
    Notes: Ni(COD)2 reagiert in THF mit Verbindungen des Typs MeIEPh3 (E = Si, Ge, Sn) unter Substitution zu den Elementenkomplexen MeIXNi(EPh3)X (THF)Y. Im Falle der Ligan-den GePh-3 und SnPh-3 wird eine Viererkoordination, bei SiPh-3 dagegen nur eine Dreier- bzw. Zweierkoordination erreicht. Im Zuge der Umsetzung von Ni(COD)2 mit LiPbPh3 entsteht Hexaphenyldiplumban und Li2Ni(COD)Ph2(THF)5 (COD = Cyclooctadien-1,5)Die 1H-NMR-, 29Si-NMR- und 119Sn-Mössbauerspektren der Komplexe MeIXNi(EPh3)X(THF)Y werden mit denen der Alkaliverbindungen MeIEPh3 verglichen. Für die Größe der chemischen Verschiebungen sind magnetische Anisotropieeffekte der Atome Ge, Sn, Pb und Ni von erstrangiger Bedeutung. Das 119Sn-Mössbauerspektrum von Na4Ni(SnPh3)4(THF)4 läßt den n-Donatorcharakter der Liganden SnPh-3 erkennen. Für eine π-Rückgabebindung zwischen dem Zentralatom und diesen Liganden kann kein Nachweis erbracht werden.
    Additional Material: 12 Tab.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed Ligand Complexes of Nickel(0) and Cobalt(I) with the Anionic Ligands E(C6H5)3- (E = Ge, Sn, Pb)Complexes of the general formula MINi(PPh3)3(EPh3)(THF)x (E = Ge[Ia], Sn[Ib], Pb[Ic]) and MI3Ni(PPh3)(EPh3)3(THF)x (E = Ge[IIa], Sn[IIb]) are formed from (Ph3P)2Ni(C2H4) by substitution with MIEPh3. The analogous complexes of the ligand SiPh3- could not be prepared, because of the formation of SiPh4 from LiSiPh3 and coordinated PPh3. Attempts to synthesize a nickel(II) complex of the ligand SnPh3- had no success, only possible decomposition products of these compounds, like (nBu2PPh)2NiII(Ph)Cl and NaxNi°(PPh3)4-x(SnP4)x(THF)Y, were isolated. NaCoI(PPh3)2(SnPh3)2(THF)7 (IV) was prepared by the reaction of Co(PPh3)3Cl and NaSnPh3.1H-NMR and 119Sn Mössbauer spectra show a higher donor action of SnPh3- in IIb than in Ib. This causes a stronger π-back donation Ni → P in the case of IIb. IV is a paramagnetic compound, the vis-spectrum is discussed using simple crystal field theory.
    Notes: (Ph3P)2Ni°(C2H4) reagiert mit Verbindungen des Typs MIEPh3 unter Substitution zu Gemischtligand-Komplexen MINi°(PPh3)3(EPh3)(THF)x (E = Ge[Ia], Sn[Ib], Pb[Ic]) bzw. MI3 Ni°(PPh3)3(EPh3) (THF)x (E = Ge[IIa], Sn[IIb]). Analoge Komplexe mit dem Liganden SiPh3- konnten nicht isoliert werden, da LiSiPh3 mit komplex gebundenem PPh3 zu SiPh4 reagiert. Versuche zur Synthese von Nickel(II)-Komplexen des Liganden SnPh3- blieben ohne Erfolg, es wurden nur mögliche Zersetzungsprodukte dieser Verbindungen isoliert [(nBu2PPh)2Ni(Ph)Cl und NaxNi(PPh3)4-X(SnPh3)x(THF)Y]. Die Umsetzung von (Ph3P)3CoCl mit NaSnPh3 führt zu NaCoI (PPh3)2(SnPh3)2(THF)7.Aus den 1H-NMR- und den 119Sn-Mößbauerspektren ergibt sich, daß die Donatorwirkung der Liganden SnPh3- beim Übergang von Ib zu IIb ansteigt. Daraus resultiert für IIb eine im Vergleich zu Ib höhere π-Backdonation. IV ist paramagnetisch, das VIS-Spektrum kann auf der Basis der Kristallfeldtheorie erklärt werden.
    Additional Material: 1 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 510 (1984), S. 11-15 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Benzyl Nickel(II) Complexes and their ReactionsBy the oxydative addition of p-substituted benzyl chlorides to (Ph3P)2Ni(C2H4) at -20°C the violet nickel(II) complexes (Ph3P)2Ni(p-CH2C6H4R)Cl (R = CN, COOH, CH3, Cl) are, formed. In water containing solutions the carbonic acid (Ph3P)2Ni(p-CH2C6H4COOH)Cl is rearranged to the corresponding p-methylbenzoate.With carbon dioxide the complexes (Ph3P)2Ni(p—CH2C6H4R)Cl react like Grignard compounds. Diphenyl ethine and butadien-1,3 are inserted in the Ni - C bond at room temperature. Substituted nickel-σ-vinyl or π-allyl complexes are obtained. The reactivity of the nickel-σ-benzyl compounds is compared with that of other nickel(II)-alkyl compounds.
    Notes: Die oxydative Addition von p-substituierten Benzylchloriden an (Ph3P)2—Ni(C2H4) bei -20°C ergibt die violetten Nickel(II)-Komplexe (Ph3P)2Ni(p—CH2C6H4R)Cl (R = CN, COOH, CH3, Cl). Die Carbonsäure (Ph3P)2Ni(p—CH2C6H4COOH)Cl lagert sich in Gegenwart von Wasser in das entsprechende p-Methylbenzoat ein.Die Verbindungen des Typs (Ph3P)2Ni(p—CH2C6H4R)Cl reagieren mit Kohlendioxid grignardanalog. Diphenylethin und Butadien-1,3 werden bei normaler Temperatur in die Ni - C-Bindung eingeschoben. Dabei entstehen substituierte Nickel-σ-vinyl- bzw. π-allyl-Komplexe. Das Reaktionsverhalten der Nickel-σ-benzylverbindungen wird mit dem anderer Nickel(II)-alkylverbindungen verglichen.
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 25 (1984), S. 5871-5874 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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