Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0020-1693
    Keywords: Azulene complexes ; Carbonyl complexes ; Cobalt complexes ; Crystal structures ; Dinuclear complexes ; Phosphine complexes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1664-1668 
    ISSN: 0044-2313
    Keywords: Dirhenium complex anion ; rheniummolybdenum complex anion ; NMR data ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Insertion of a Terminal Halogeno Ligand into Diorgano-bridged Dirhenium and Rhenium-Molybdenum Complex Anions in the Presence of an Amidin Cation and the Isomerization ProcessesThe equimolar reaction of in situ generated anion Anions Re2(μ-PCy2)(CO)8- (Re—Re) in the presence of a steric expansive amidine cation DBUH+ with bromine and iodine in tetrahydrofuran solution gave the two isomers Re2(PCy2)(CO)8X (Re—Re) and Re2(μ-PCy2)(μ-X)(CO)8 (X = Br, I), of which the isomer with a terminal X ligand as major product was formed under maintenance of the Re—Re bond. The monotropic isomerization process of Re2(μ-PCy2)(CO)8I runs thermically relative slowly, but more rapid in photochemical and electrochemical processes. The analogeous reaction of the heterometallic anion ReMo(η5-C5H5)(μ-PPh2)(CO)6- with iodine delivers opposite to the former reaction mainly the bridged isomer ReMo(η5-C5H5)(μ-PPh2μ-I)(CO)6 besides ReMo(η5-C5H5)(μ-PPh2)(CO)6I. The obtained complexes were characterized by means of v(CO) and 31P NMR spectroscopic measurements. Single-crystal analyses led to the subsequent metal - metal bond lengths: Re—Re of 308.0(1) pm in Re2(μ-PCy2)(CO)8Br and Re—Mo of 313.6(1) pm in ReMo(η5-C5H5)(μ-PPh2)(CO)6I.
    Notes: Die äquimolare Umsetzung des in situ gebildeten Anions Re2(μ-PCy2)(CO)8 (Re—Re) in Gegenwart eines sterisch anspruchsvollen Amidinkations DBUH+ mit Brom und Jod in Tetrahydrofuranlösung bei 20°C ergab jeweils von beiden Isomeren Re2(μ-PCy2)(CO)8X (Re—Re) und Re2(μ-PCy2)(μ-X)(CO)8 (X = Br, I) überwiegend dasjenige mit terminal gebundenem Halogenoliganden unter Aufrechterhaltung der Re—Re-Bindung. Die monotrope Isomerisierung von Re2(μ-PCy2)(CO)8I verläuft thermisch relativ langsam, aber photochemisch und elektrochemisch schneller. Die analoge Umsetzung des heterometallischen Anions ReMo(η5-C5H5)(μ-PPh2)(CO)6 mit Jod lieferte demgegenüber bevorzugt das verbrückte Isomer ReMo(η5-C5H5)(μ-PPh2)(μ-I)(CO)6 neben ReMo(η5-C5H5)(μ-PPh2)(CO)6I. Die erhaltenen Komplexe wurden durch v(CO)- und 31P NMR-spektroskopische Daten charakterisiert. Einkristall-Röntgenstrukturanalysen führten zu folgenden Metall - Metall-Bindungslängen: Re—Re von 308,0(1) pm in Re2(μ-PCy2)(CO)8Br und Re—Mo von 313,6(1) pm in ReMo(η5-C5H5)(μ-PPh2)(CO)6I.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 807-812 
    ISSN: 0044-2313
    Keywords: Dirheniumcarbonyl Complexes ; Phosphine-Bridged-Clusters ; Tris(trimethylsilyl)phosphine ; NMR Data ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Molecular Structures of Oligofunctional Dirhenium Carbonyl Derivatives from Dirhenium NonacarbonylphosphaneStarting with dirheniumdecacarbonyl, one CO-Ligand was eliminated oxidatively and substituted by the labile acetonitrile ligand. As an intermediate eq-Re2(CO)9NCCH3 was received. The reaction of this labilised carbonyl with tris(trimethylsilyl)phosphine and subsequent methanolysis gave ax-Re2(CO)9PH3, which was isolated and characterized for the first time. Photochemical and thermal reaction of ax-Re2(CO)9PH3 led to the new bi- and trinuclear complexes Re2(μ-H)(μ3-PHRe(CO)5)(CO)8, Re2(μ-PH2)2(CO)8 and Re2(μ-H) · (μ-PH2)(CO)8, which were characterized by IR-, 1H- and 31P-NMR spectroscopy. The structures of ax-Re2(CO)9PH3, Re2(μ-H)(μ3-PHRe(CO)5)(CO)8 and Re2(μ-PH2)2(CO)8 were confirmed by single-crystal X-ray analysis. ax-Re2(CO)9PH3 has a very short Re—P bond length of 228(2) pm.
    Notes: Vom Dirheniumdecacarbonyl wurde ein CO-Ligand oxidativ entfernt und der labile Acetonitrilligand eingeführt. Als Zwischenprodukt wurde äq-Re2(CO)9NCCH3 erhalten. Dessen Umsetzung mit Tris(trimethylsilyl)phosphan und anschließender Methanolyse ergab ax-Re2(CO)9PH3, welches erstmals isoliert und vollständig charakterisiert werden konnte. Die thermische Belastung, bzw. die Bestrahlung mit ultraviolettem Licht dieser Ausgangsverbindung führte zu den neuen Zwei- und Dreikernkomplexen Re2(μ-H)(μ3-PHRe(CO)5)(CO)8, Re2(μ-PH2)2(CO)8 und Re2(μ-H)(μ-PH2)(CO)8, die mit IR-, 1H- und 31P-NMR-Spektroskopie charakterisiert wurden. Eine vollständige Molekülstrukturaufklärung erfolgte für ax-Re2(CO)9PH3, Re2(μ-H)(μ3-PHRe(CO)5)(CO)8 und Re2(μ-PH2)2(CO)8 durch Einkristall-Röntgenstrukturanalysen. ax-Re2(CO)9PH3 weist einen sehr kurzen Rhenium-Phosphor-Bindungsabstand Re—P von 228(2) pm auf.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...