Halfsandwich tungsten complexes with a silanol-functionalized cyclopentadienyl ligand : synthesis and reactivity

Within the studies concerning metallo-silanols, halfsandwich-tungsten complexes have been silanol-functionalized at the cyclopentadienyl ligand. The stability and the condensation behavior have been investigated. Thus, it was shown that these complexes are stable enough for isolation but they are reactiv enough for time-effective condensation reactions with diverse chlorosilanes, chlorostannanes or metalhalogenides. These processes are characterized by an increased reactivity in contrast to metallo-silanols with a direct metal-bonded silanol group and proves that the separation of the silanol group has to be regarded as a successful manipulation. In addition, this modification allows a wide variation of the ligand sphere of the metal which was shown by H/Cl exchange, methylation, silylation or phosphine substitution. These changes evoke a small but significant influence on the silanol group. For example leads an introduced phosphine to an enhanced stability of the silanol function. A further separation of the silanol group from the metal by an additional alkylidene spacer leads to the complete lost of the stabilizing effect of the metal fragment and generates silanols which show a condensation behavior very similar to those of ordinary organosilanols.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Würzburg

Year

2005

Author dc:creator

• Bera, Holger

Contributors dc:contributor

• Malisch, Wolfgang

• Wolfram
• Halbsandwich-Komplexe
• Metallo-silanole
• Tungsten
• Halfsandwich-complexes
• Metallo-silanols

Repository record source_url

https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/1159

OAI identifier oai:identifier

oai:opus.bibliothek.uni-wuerzburg.de:1159