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Science 1 February 2002:
Vol. 295. no. 5556, pp. 832 - 834
DOI: 10.1126/science.1067325
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Reports

A Carbon-Free Sandwich Complex [(P5)2Ti]2-

Eugenijus Urnėžius,1*dagger William W. Brennessel,1 Christopher J. Cramer,1 John E. Ellis,1dagger Paul von Ragué Schleyer2

Reactions of highly reduced titanium complexes with white phosphorus, P4, at or below 25°C yielded brown to deep red-brown salts of the first entirely inorganic metallocene, [(eta 5-P5)2Ti]2-(1). Like ferrocene and other carbon-based metallocenes, the structure of 1 has parallel and planar five-membered rings symmetrically positioned about the central metal atom. Despite its electron-deficient (16 electron) and formally zerovalent titanium character, salts of 1 are highly stable toward heat and air, both in solution and in the solid state. Computational studies show that the pentaphosphacyclopentadienyl unit, P5, functions as an unusually effective acceptor ligand, and this results in substantial stabilization of 1.

1 Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
2 Computational Chemistry Annex, University of Georgia, Athens, GA 30602, USA.
*   Present address: Department of Chemistry, Michigan Technological University, Houghton, MI 49931, USA.

dagger    To whom correspondence should be addressed. E-mail: urnezius{at}mtu.edu, ellis{at}chem.umn.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)