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  • 1975-1979  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 3142-3149 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 3015-3024 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Complexes of Tetrapyrrole Ligands, XVII: Octacoordinate Zirconium and Hafnium Porphines Containing Axial 1,3-Diketonate LigandsNew (1,3-diketonato)Metalloporphyrins Zr(OÄP)(acac)2 (3a), Hf(OÄP)-(dbm)2 3c, Hf(OÄP)(dbm)2 (3d), and Zr(OÄP)(acac)OPh (5)2 are prepared and characterized spectroscopically. By analogy to the structurally secured acetato complexes, e. g. Zr(OÄP)(OAc)2 (2a), the central metal ions in 3a-d are regarded as octacoordinate with bidentate axial ligands. This follows from the i.r. and 1H n.m.r. spectra. The cis-configurations 3A of 3a-d and 5A are compared with the configuration 1A, 2A, and 4A of related species.
    Notes: Neue (1,3-Diketonato)metallporphyrine Zr(OÄP)(acac)2 (3a), Hf(OÄP)(acac)2 (3b), Zr(OÄP)-(dbm)2 (3c), Hf(OÄP)(dbm)2 (3d) und Zr(OÄP)(acac)OPh (5) 2 werden dargestellt und spektroskopisch charakterisiert. In Analogie zu den strukturell gesicherten Acetatkomplexen, z. B. Zr(OÄP)(OAc)2 (2a), wird den Zentralmetall-lonen in 3a-d die Koordinationszahl 8 mit zweizähnig gebundenen Axial-Liganden zugeschrieben. Dies ergibt sich aus den IR- und 1H-NMR-Spektren. Die cis-Konfigurationen 3A von 3a-d und 5A werden mit den Konfigurationen 1A 2A und 4A einiger verwandter Spezies verglichen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1465-1476 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Complexes of Tetrapyrrole Ligands, XVI: Methoxonitrosyl(octaethylporphinato)osmium(II)and related Osmium Complexes of OctaethylporphineThe new diamagnetic nitrosyl(octaethylporphinato)osmium (II) derivatives Os(OÄP)NO· L′(2c-e; L′ = NO, OMe, or F)2 are prepared and characterized spectroscopically. According to the electronic absorption, i.r., and 1H n.m.r. spectra fo the bis(methoxo)osmium(IV) derivative Os(OÄP)(OMe)2 (2f) and of the nitrosyls 2d, e, the latter contain OsII with an linear N≡O⊕ group and an anion OMe⊖ or F⊖ in the trans position. The strong π-acceptor NO⊕ and the strong π-donator OMe⊖ (or F⊖) effect a push-pull stabilization of the system. The dinitrosyl 2c probably shows the rare trans-array of linear M — N ≡ O⊕ and an bent M — N = O⊖ unit. The porphine ligand acts as a probe of the π-acceptor capacity of the axial ligands; in the series Py 〈 N2 〈 CO 〈 NO⊕ an increasing bathochromic shift of the α-band in the spectral region from 510 to 580 nm obtains.
    Notes: Neue, diamagnetische Nitrosyl(octaäthylporphinato)osmium(II)-Derivate OS(OÄP)NO· L′(2c bis e; L′ = NO, OMe oder F)2 werden dargestellt und spektroskopisch charakterisiert. Nach einem Vergleich der Elektronenanregungs-, IR- und 1H-NMR-Spektren des Bis(methoxo)osmium(IV) Derivats Os(OÄP)(OMe)2 (2f) und der Nitrosyl 2d, e liegt in der letzteren Os11 mit linearer N ≡ O⊕-Gruppierung und trans-ständigem Anion OMe⊖ oder F⊖ vor. Der starke π-Acceptor NO⊕ und der starke π-Donator OMe⊖ (oder F⊖) bewirken eine „push-pull“ -Stabilisierung des Systems. Im Dinitrosyl 2c light wahrscheinlich die seltene trans-Anordnung einer Linearen M—N≡O⊕- und einer gewinkelten M—N=O⊖-Einheit vor. Der Porphin-Ligand wirkt als Sonde für die π-Acceptorstärke der axialen Liganden; in der Reihe Py 〈 N2 〈 CO 〈 NO⊕ erfolgt eine zunehmend bathochrome Verschiebung der α-Bande im Spektralbereich von 510 bis 580 nm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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