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Tetrakis(phenylethynyl)tin(IV)

✍ Scribed by Lahcini, Mohammed ;Räisänen, Minna T. ;Castro, Pascal M. ;Klinga, Martti ;Leskelä, Markku

Publisher
International Union of Crystallography
Year
2007
Tongue
English
Weight
604 KB
Volume
63
Category
Article
ISSN
1600-5368

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✦ Synopsis

The asymmetric unit of the crystal structure of the title compound, [Sn(C~8~H~5~)~4~], consists of one fourth of a discrete tin complex and one half of another which both possess nearly ideal tetrahedral symmetry; the site symmetries of the two Sn atoms are \overline4 and 2. The bond angles at all acetylide C atoms are almost linear. The Sn—C distances [2.076 (6) and 2.065 (6)–2.069 (6) Å in the two complexes) are short when compared to the sum of the covalent radii of C and Sn (2.177 Å), but consistent with another tetrakis(alkynyl)tin complex. The acetylenic bond distances [1.196 (7) and 1.183 (7)–1.207 (7) Å] are consistent with a triple C[triple-bond]C bond. Therefore, despite the short Sn—C distances, the ligands are mainly σ-bonded to the metal. In the solid state, these complexes form a three-dimensional network via agostic C—H interactions as a phenyl proton in the ortho position interacts with the acetylenic carbon in the α position to the tin center.

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