Synthesis and characterization of organometallic ionic liquids and a heterometallic carbene complex containing the chromium tricarbonyl fragment

Direct reaction between [Cr(CO)<sub>6</sub>] and arenes with ionic substituents affords the corresponding arene-chromium tricarbonyl complexes, [Cr(CO)<sub>3</sub>(arene)], in only modest yield. In contrast, these complexes can be prepared in pure form in excellent yield from the reaction of [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>Br)] with, for example, N-methylimidazole. The structures of [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>MIM)]Br (MIM = 3-methylimidazolium), [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>MMIM)]Br (MMIM = 2,3-dimethylimidazolium), and [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>NMe<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>OH)]Br have been established by X-ray diffraction analysis. Subsequent exchange of the bromide anion for Tf<sub>2</sub>N<sup>-</sup> affords new organometallic salts with melting points below 70 degrees C. Reaction of the bromide salts include tosylation of [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>NMe<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>OH)]Br to afford [Cr(CO)<sub>3</sub>(&eta;<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>NMe<sub>2</sub>(CH<sub>2</sub>)<sub>2</sub>OTs)]Br and the formation of the heterometallic carbene complex [Ru(&eta;<sup>6</sup>-p-cymene)Cl<sub>2</sub>{C<sub>4</sub>H<sub>5</sub>N<sub>2</sub>CH<sub>2</sub>Ph-&eta;<sup>6</sup>-Cr(CO)<sub>3</sub>}]. Both compounds were characterized in the solid state by X-ray diffraction.


Published in:
ORGANOMETALLICS, 24, 16, 4039-4048
Year:
2005
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 Record created 2005-11-09, last modified 2018-03-17


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