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  • Inorganic Chemistry  (83,671)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 43 (1910), S. 3400-3401 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 93 (1960), S. 1982-1988 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Lage der ⊕NH-Valenzschwingungsfrequenz aliphatischer Aminperchlorate hängt vom Grad der Substitution am Stickstoff ab; die Bande verschiebt sich langwellig, wenn die Anzahl der H-Atome am N abnimmt. Diese Verschiebung wird durch einen Polarisationseffekt erklärt.  -  Bei den Perchloraten prim. Amine verschiebt sich die ⊕NH-Bande in der Reihe Methyl-, Äthyl-, Isopropyl-und tert.-Butylamin ebenfalls langwellig.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 55 (1922), S. 2197-2205 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2149-2150 
    ISSN: 0009-2940
    Keywords: Photochemistry ; ortho-Chinodimethanes ; Trapping reactions ; Two-photon chemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ω-Hydroxy-ortho-quinodimethane (2), generated by photoenolization of 2-methylbenzaldehyde (1) in benzene, is quantitatively trapped with trifluoroacetone to give the bicyclic hemiacetal 6 and the hydroxy aldehyde 7. A less effective trapping reaction is observed with benzaldehyde with the formation of the bicyclic hemiacetal 5. The formation of benzocyclobutenol 4 is probable due to a two-photon process involving electronically excited 2.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1657-1669 
    ISSN: 0009-2940
    Keywords: Anions, [ω-(phosphanyl)alkyl]cyclopentadienyl ; Cobalt, [ω-(phosphanyl)alkyl]cyclopentadienyl complexes ; Cobalt(I) chelate complexes ; Iron, [ω-(phosphanyl)alkyl]cyclopentadienyl complexes ; Zirconium, [ω-(phosphanyl)alkyl]cyclopentadienyl complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses and characterisation of the [ω-(phosphanyl)alkyl]cyclopentadienyl anions 2, 3, 6-8, 10, and 11 are described. These anions form metallocenes 12-15 and 17-19 with FeCl2 · 2 THF and with ZrCl4 · 2 THF, respectively. With ICo(CO)4 chelated carbonbyl complexes 23-25, 28, and 29 are formed. The unchelated intermediate 20 has been detected by IR spectroscopy. The carbonyl chelate complexes are thermally stable. Under photochemical conditions, ligand exchange reactions are possible which in the case of 1,5-cyclooctadiene proceed with decomplexation of the phosphane arm. This does not prevent a reaction at the cobalt(I) atom; treatment of 35 with diphenylethyne gives the corresponding tetraphenylcyclobutadiene complex 36 in good yield, the phosphane arm remaining uncoordinated.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 2807-2811 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der bifunktionelle Ligand H2C=CH—CN∣ ist in der ∣NC-Gruppe ein n-Donator und in der -Gruppe ein π-Donator. Er ist in monosubstituierten Metallcarbonylen über die |NC-Gruppe σ-gebunden, wenn die π-Donatorstärke am Metall klein ist, und π-gebunden über die -Gruppe bei großer π-Donatorstärke am Metall.  -  Bei gleichem Zentralatom wird in den Aromatenchromtricarbonyl-Derivaten ArCr(CO)2D der Übergang vom σ-zum π-gebundenen Liganden beobachtet, wenn die π-Donatorstärke am Chrom durch Variation des Aromaten erhöht wird.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1246-1258 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: σ-Donor-and π-Acceptor Properties of the Phosphine Ligands in Complexes of the Type of the cis-Mo(CO)4(R3—nPXn)2The first vertical ionisation potentials obtained from the u. v. photoelectron spectra are proposed to give a relative measure for the σ-donor ability of a series of phosphine ligands L (R3—nPXn, R=Me, tBu; X=H, F, Cl; n = 0-3, and (Me2N)3—nPXn, X=F, Cl, n = 0, 1, 2). Using this scale the ligands L could be classified according to their π-bonding ability by comparison of the CO-stretching frequencies and force constants within the series of complexes cis-Mo(CO)4L2. Ten complexes cis—Mo(CO)4(R3—nPXn)2 (R=Me, tBu; X=H, F, Cl; n = 1, 2) have been prepared and characterized for the first time.
    Notes: Die aus den UV-Photoelektronenspektren zu entnehmenden Ionisierungspotentiale der «freien Elektronenpaare» am Phosphor werden als ein relatives Maß für die σ-Donatorfähigkeit der Phosphinliganden L (R3—nPXn, R=Me, tBu; X=H, Cl, F; n = 0-3, und (Me2N)3—nPXn, X=F, Cl, n = 0, 1, 2) vorgeschlagen. Unter Verwendung der sich damit ergebenden Reihenfolge konnten durch Vergleich von CO-Valenzschwingungsfrequenzen und -kraftkonstanten innerhalb der Komplexreihe cis—Mo(CO)4L2 die Liganden hinsichtlich ihrer π-Acceptoreigenschaften klassifiziert werden. Zehn Komplexe cis-Mo(CO)4(R3—nPXn)2 (R=Me, tBu; X=H, F, Cl; n = 1, 2) wurden erstmals synthetisiert und charakterisiert.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 28-34 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: π-Orbital Interaction „Through Space“ and „Through Bond“ in Tricyclo[4.2.0.02,5]octadienesThe first four bands in the photoelectron spectra of anti- and syn-tricyclo[4.2.0.02,5]octadiene (2 and 3, respectively) have been assigned to specific molecular orbitals. This assignment is based on the concept of „through space“ and „through bond“( interaction between the two basis π-orbitals. Because of the different configurations of 2 and 3 it is possible to separate the two types of interactions. In both cases the „through bond“ interaction dominates. As a result the symmetric linear combination π+ (symmetric with respect to the twofold rotation axis in 2 or the plane of symmetry in 3) lies above the antisymmetric combination π-. The orbital energy differences ε(π+) - ε(π-) are 0.97 eV in 2 and 0.36 eV in 3.
    Notes: Die vier ersten Banden im Photoelektronenspektrum des anti- und des syn-Tricyclo[4.2.0.02.5]-octadiens (2 bzw. 3) werden, unter Verwendung des Konzepts der „through space“- und „through bond“-Wechselwirkung zwischen den beiden Basis-π-Orbitalen, bestimmten Molekülorbitalen zugeordnet. Wegen der unterschiedlichen Konfiguration von 2 und 3 lassen sich im vorliegenden Fall die beiden Wechselwirkungstypen trennen. Sowohl in 2 als auch überraschenderweise in 3 dominiert die „through bond“-Wechselwirkung, so daß in beiden Fällen die symmetrische Linearkombination π+ der π+-Orbitale (in 2 bezüglich der zweizähligen Achse, in 3 bezüglich der Spiegelebene) energetisch über der antisymmetrischen Kombination π- zu liegen kommt. Die Energiedifferenz ε(π+) - ε(π-) beträgt in 2 0.97 eV, in 3 0.36 eV.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3557-3563 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: π-Complexes of Methoxy-substituted Ethylenes, II The System (Acetylacetonato)bis(olefin)rhodiumOlefin exchange reaction on (acetylacetonato)bis(ethylene)rhodium (acac)Rh-(C2H4)2, have been used to prepare complexes containing methoxy-susbtituted ethylenes. The new complexes are of the type (acac)Rh(C2H4)L [L = methyl vinyl ether (2b), cis- or trans-dimethoxyethylene ((2d) or (2e)), tetramethoxyethylene (2f)] and the type (acac)RhL2 [L = Methyl vinyl either (3b), cis- or trans-dimethoxyethylene (3d or 3e)]. The 1H-n.m.r. spectra of these complexes are reported. In the case of the cis-dimethoxyethylene compounds, 2d and 3d 1H-n.m.r. spectra have been used to deduce the low-temperature arrangement of the ligands which is attained after the olefin rotation is frozen.
    Notes: Mit Hilfe von Olefinaustauschreaktionen an (Acetylacetonato)bis(äthylen)rhodium, (acac)Rh-(C2H4)2, können Komplexe der methoxy-substituierten Äthylene dargestellt werden, die den beiden Komplextypen (acac)Rh-(C2H4)L [L = Methylvinyläther (2b), cis -bzw. trans-Dimethoxyäthylen ((2d) bzw. (2e)), Tetramethoxyäthylen (2f)] und (acac)RhL2 [L = Methylvinyläther (3b), cis bzw. trans-Dimethoxyäthylen (3d bzw. 3e)] entsprechen, Für die neuen Komplexe werden die 1H-NMR-spektren angegeben. Im Falle der Verbindungen des cis-Dimethoxyäthylens, 2d und 3d, wird die bei tiefer Temperatur bevorzugte Anordnung der Olefinliganden, die sich nach dem Einfrieren der Olefinrotation einstellt, aus den 1H-NMR-spektren abgeleitet.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1709-1720 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: π-Complexes of 1-Methyl-3,5-diphenylthiabenzene 1-Oxide with Tricarbonylchromium, -molybdenum, and -tungsten1-Methyl-3,5-diphenylthiabenzene 1-oxide (1) reacts with the tris(acetonitrile)tricarbonyl complexes of chromium, molybdenum, and tungsten to yield red air-stable complexes of the composition tricarbonyl(1-methyl-3,5-diphenylthiabenzene 1-oxide)metal(0) (2). From the reaction of (CH3CN)3Cr(CO)3 with the heterocycle two isomers 2a and 2d are obtained. Their molecular structures are elucidated by X-ray analysis. From this it is evident that the complexed ligand is non-planar. There are no bonding interactions between the metal and the sulfur atom.
    Notes: 1-Methyl-3,5-diphenylthiabenzol-1-oxid (1) reagiert mit den Tris(acetonitril)tricarbonyl-Komplexen von Chrom, Molybdän und Wolfram zu roten luftstabilen Komplexen der Zusammensetzung Tricarbonyl(1-methyl-3,5-diphenylthiabenzol-1-oxid)metall(0) (2). Aus der Reaktion von (CH3CN)3Cr(CO)3 mit dem Heterocyclus werden zwei Isomere 2a und 2d erhalten, deren Molekülstruktur durch Röntgenstrukturanalyse aufgeklärt wurde. Dabei zeigte sich, daß der komplexierte Ligand nicht planar ist und das Metall keine Bindung zum Schwefelatom ausbildet.
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