Synthesis and Solid State Structures of Sterically Crowded d0-Metallocenes of Magnesium, Calcium, Strontium, Barium, Samarium, and Ytterbium
Weber, Frank, Sitzmann, Helmut, Schultz, Madeleine, Sofield, Chadwick D., & Andersen, Richard A. (2002) Synthesis and Solid State Structures of Sterically Crowded d0-Metallocenes of Magnesium, Calcium, Strontium, Barium, Samarium, and Ytterbium. Organometallics, 21(15), pp. 3139-3146.
The base-free metallocenes [1,2,4-(Me3C)3C5H2]2Ca, [1,2,4-(Me3C)3C5H2]2Sr, and [1,2,4-(Me3C)3C5H2]2Ba have been prepared by reaction of MI2 and the sodium or potassium salt of the substituted cyclopentadiene anion in THF, while [1,2,4-(Me3C)3C5H2]2Mg was prepared from the cyclopentadiene, 1,2,4-(Me3C)3C5H3, and dibutylmagnesium. The structures of the magnesocene and calcocene as well as those of the previously prepared ytterbium and samarium analgoues have been determined by X-ray crystallography. The metallocenes are slightly bent in the solid state with centroid-metal-centroid angles ranging from 163 degrees to 173 degrees. Adducts of the strontocene and samarocene with THF and of the barocene, samarocene, and ytterbocene with 2,6-Me2C6H3NC have also been prepared and characterized. The massive bulk of the [1,2,4-(Me3C)3C5H2]- ligand leads to behavior quite different from that previously observed for base-free metallocenes of the alkaline earths and divalent lanthanides.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
|Item Type:||Journal Article|
|Additional Information:||This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > OTHER CHEMICAL SCIENCES (039900) > Organometallic Chemistry (039904)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2002 American Chemical Society|
|Deposited On:||20 Aug 2007|
|Last Modified:||09 Mar 2011 01:58|
Repository Staff Only: item control page