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Synthesis and Orientation of Poly(Dialkylstannane)s

Published online by Cambridge University Press:  17 March 2011

Fabien Choffat ,
Sara Fornera ,
Paul Smith  and
Walter Caseri
Fabien Choffat
Affiliation:
Department of Materials, ETH Zürich, Zürich, CH-8093, Switzerland
Sara Fornera
Affiliation:
Department of Materials, ETH Zürich, Zürich, CH-8093, Switzerland
Paul Smith
Affiliation:
Department of Materials, ETH Zürich, Zürich, CH-8093, Switzerland
Walter Caseri
Affiliation:
Department of Materials, ETH Zürich, Zürich, CH-8093, Switzerland
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Abstract

Polystannanes, i.e. organometallic polymers of the chemical formula (SnR2)n, are relatively little explored, although they belong to the rare examples of polymers which are characterized by a backbone of metal atoms which are linked by covalent bonds. We developed a new synthetic route which yields pure linear poly(dibutylstannane) [Sn(Bu)2]n by polymerization of dibutylstannane (dibutyltin dihydride) with the catalyst [RhCl(PPh3)3]. Here, we report that the conversion and the reaction rate of dibutylstannane depends crucially on the temperature and [RhCl(PPh3)3] is also suited for the polymerization of dioctylstannane and didodecylstannane. The polymers thus obtained were characterized by 1H, 13C and 119Sn NMR spectroscopy: Orientation of all polystannanes was achieved by tensile drawing. The orientation was examined by UV-vis spectroscopy with polarized light and X-ray diffraction. Remarkably, the orientation of the backbone depended on the length of the alkyl groups.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1007: Symposium S – Organic/Inorganic Hybrid Materials-2007 , 2007 , 1007-S10-03
Copyright
Copyright © Materials Research Society 2007

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