Crystal Structures of Titanium(III) Bis(acetylide) Tweezer Complexes with Alkali Metal Cations

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Title:Crystal Structures of Titanium(III) Bis(acetylide) Tweezer Complexes with Alkali Metal Cations
Creators:
Hiller, Jörg
Varga, Vojtech
Thewalt, Ulf
Mach, Karel
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 62, 9, pp. 1446-1456
Uncontrolled Keywords:Octamethyltitanocene, Bis(acetylides), Tweezer complexes, Titanium(III) complexes

Abstract

Crystal structures of the Ti(III) tweezer complexes [(C<sub>5</sub>HMe<sub>4</sub>)<sub>2</sub>Ti(σ-C≡CSiMe<sub>3</sub>)<sub>2</sub>]<sup>-</sup>[Li(THF)<sub>2</sub>]<sup>+</sup> (<strong>2a</strong>), [(C<sub>5</sub>HMe<sub>4</sub>)<sub>2</sub>Ti(σ-C≡CSiMe<sub>3</sub>)<sub>2</sub>]<sup>-</sup>Na<sup>+ </sup>(<strong>3</strong>) and [(C<sub>5</sub>HMe<sub>4</sub>)<sub>2</sub>Ti(σ-C≡CSiMe<sub>3</sub>)<sub>2</sub>]<sup>-</sup>Cs<sup>+</sup> (<strong>5</strong>) have been determined. In all of them the alkali metal cation is placed away from the Ti-C<sub>α1</sub>-C<sub>α2</sub> plane at the distance: Li<sup>+</sup> 0.511 Å, Na<sup>+</sup> 1.023 Å and Cs<sup>+</sup> 0.521 Å. The reason for the deviation of Li<sup>+</sup> in <strong>2a</strong> is the asymmetrical orientation of the THF ligands in the [Li(THF)<sub>2</sub>]<sup>+</sup> cation with respect to the Ti-C<sub>α1</sub>-C<sub>α2</sub> plane, which seems to release the steric congestion between the THF ligands and the trimethylsilyl groups. In <strong>3</strong> and <strong>5</strong>, the molecules form polymer chains with a weak intermolecular bonding interaction between the cations and one of the C<sub>5</sub>HMe<sub>4</sub> ligands of the neighbouring molecule in a sandwich manner. <p>

Title:Crystal Structures of Titanium(III) Bis(acetylide) Tweezer Complexes with Alkali Metal Cations
Creators:
Hiller, Jörg
Varga, Vojtech
Thewalt, Ulf
Mach, Karel
Uncontrolled Keywords:Octamethyltitanocene, Bis(acetylides), Tweezer complexes, Titanium(III) complexes
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:62
Number:9
Page Range:pp. 1446-1456
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19971446UNSPECIFIED
ID Code:1220
Item Type:Article
Deposited On:06 Feb 2009 17:07
Last Modified:06 Feb 2009 16:07

Citation

Hiller, Jörg; Varga, Vojtech; Thewalt, Ulf; Mach, Karel (1997) Crystal Structures of Titanium(III) Bis(acetylide) Tweezer Complexes with Alkali Metal Cations. Collection of Czechoslovak Chemical Communications, 62 (9). pp. 1446-1456. ISSN 0010-0765

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