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  • 1
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit verbrückten permethylierten Cyclopentadienylliganden (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1750-1754 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Complexes with Bridged Permethylated Cyclopentadienyl LigandsThe preparation of the permethylated silyl-bridged dicyclopentadienyl ligands Me2Si(Me4C5H)2 (1) and C2H4(Me2Si(Me4C5H))2 (2) is reported. Reaction of dimetalated 1 with TiCl4 and ZrCl4 yielded the corresponding metallocenophane dihalides 3 and 4, while treatment of the dilithio derivative of 2 with GeCl2 · dioxane, SnCl2, and FeCl2 yielded the bridged metallocenes 5, 6, and 7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190529
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  • 2
    Electronic Resource
    Electronic Resource
    Blei(II)-Verbindungen mit π-gebundenen Pentamethylcyclopentadienylliganden - Synthesen, Strukturen und Bindungsverhältnisse (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 865-870 
    Details
    ISSN: 0009-2940
    Keywords: Decamethylplumbocene protonation ; Half-sandwich lead compounds ; Lead(II) π-complexes: 207Pb NMR ; (Pentamethylcyclopentadienyl)lead tetrafluoroborate, crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Lead(II) Compounds with π-Bonded pentamethylcyclopentadienyl Ligands - Syntheses, Structures, and Bonding PropertiesThe reaction of (pentamethylcyclopentadienyl)lithium with lead(II) chloride leads to Me5C5PbCl (1) or (Me5C5)2Pb (2) depending on the stoichiometry. The half-sandwich complexes Me5C5Pb(BF4) (3a) and Me5C5Pb(CF3SO3) (3b). are formed from 2 by reaction with tetrafluoroboric acid and trifluoroacetic acid, respectively. 2,2′-Bipyridine and 1,8-naphthyridine react with 3a and 3b to yield the 1:1 adducts 4a, 4b, and 5. An X-ray structure analysis of 3a shows the presence of BF4-bridged dimeric units. Based on 1H-, 13C-, 11B-, 19F-, and 207Pb-NMR data, the bonding in the π-complexes is discussed.
    Notes: Die Reaktion von (Pentamethylcyclopentadienyl)lithium mit Blei(II)-chlorid führt je nach Stöchiometrie zu Me5C5PbCl (1) oder zu (Me5C5)2Pb (2). Aus 2 entstehen durch Umsetzung mit Tetrafluoroborsäure bzw. Trifluormethansulfonsäure die Halbsandwich-Komplexe Me5C5Pb(BF4) (3a) bzw. Me5C5Pb(CF3SO3) (3b). Mit 2,2′-Bipyridin und 1,8-Naphthyridin bilden die Komplexe 3a und 3b die 1:1-Addukte 4a, 4b und 5. Eine am Komplex 3a durchgeführte Röntgenstrukturanalyse zeigt das Vorliegen BF4-verbrückter dimerer Einheiten. Die Bindungsverhältnisse in obigen π-Komplexen werden u.a. anhand von 1H-, 13C-, 11B-, 19F- und 207Pb-NMR-Daten diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220512
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  • 3
    Electronic Resource
    Electronic Resource
    Halbsandwich-Cyclopentadienylkomplexe von Germanium, Zinn und Blei mit zusätzlicher Metall-Olefin-Wechselwirkung (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 871-878 
    Details
    ISSN: 0009-2940
    Keywords: Group 14 metallocenes, σ-cyclopentadienyl ligands ; Group 14 metallocenes, protonation ; Group 14 element-alkene complexes ; Germanium(II)-alkene complexes, crystal structure ; Tin(II)-alkene complexes, crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Half-Sandwich Cyclopentadienyl Complexes of Germaninum, Tin, and Lead with Additional Metal-Olefin InteractionsTreatment of GeCl2 · dioxane, SnCl2 and PbCl2 with two equivalents of monometallated 1,1′-(dimethylsilanediyl)bis(2,3,4,5-tetramethyl-2,4-cyclopentadiene) (2) yields the metallocenes 3, 4, and 5. Protonation with tetrafluoroboric acid (trifluoromethanesulfonic acid) leads under ligand abstraction to the ionic species (Me4C5H)Me2Si(Me4C5)El+ BF4- (CF3SO3-) with El = Ge: 6a (6b), Sn: 7a (7b), Pb: 8a (8b). Reaction of monometallated 1 with two equivalents of GeCl2 · dioxane provides (Me4C5H)Me2Si(Me4C5)Ge+ GeCl3- (6c). Crystal structure investigations of the complexes 6c and 7a confirm a metallocenophane-like structure, in which the central atom is pentahapto bonded to the cyclopentadienyl ring and furthermore weakly dihapto-bound to one of the double bonds of the cyclopentadiene ligand.
    Notes: Die Umsetzung von GeCl2 · Dioxan, SnCl2 und PbCl2 mit zwei Äquivalenten monometalliertem 1,1′-(Dimethylsilandiyl)bis-(2,3,4,5-tetramethyl-2,4-cyclopentadien) (2) führt zu den Metallocenen 3,4 und 5. Protonierung mit Tetrafluoroborsäure (Trifluormethansulfonsäure) fährt unter Abspaltung jeweils eines Liganden zu ionischen Verbindungen (Me4C5H)Me2Si(Me4C5)El+ BF4- (CF3SO3-) mit El = Ge: 6a (6b), Sn: 7a (7b), Pb: 8a (8b). Die Reaktion von monometalliertem 1 mit zwei Äquivalenten GeCl2 · Dioxan führt zu (Me4C5H)Me2Si(Me4C5)Ge+ GeCl3- (6c). Kristallstrukturuntersuchungen an den Komplexen 6c und 7a bestätigen einen metallocenophanartigen Bau, wobei das Zentralatom neben der Pentahapto-Bindung zum basalen Cyclopentadienylring eine schwache Dihapto-Koordination zu einer Doppelbindung des Cyclopentadienliganden aufweist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220513
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