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Synthesis, X-ray Crystal Structures and Reactivity Towards Alkynes of Gold(I)–Phosphinine Complexes

✍ Scribed by Nicolas Mézailles; Louis Ricard; François Mathey; Pascal Le Floch

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
396 KB
Volume
1999
Category
Article
ISSN
1434-1948

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✦ Synopsis

The coordination behaviour of 2,6-disilyl-substituted characterized. The formation of 6 results from a [4 + 2] cycloaddition between one alkynyl group of each phosphinine phosphinines towards gold(I) has been examined. The reaction of the bis(trimethylsilyl)phosphinine 1 with [AuCl(SMe 2 )] gives with the other phosphinine subunit. The formation of the cationic complex [Au(4)][GaCl 4 ] (8) occurs under classical the corresponding AuCl derivative 2. X-ray crystal structure analysis reveals that the aromaticity of the phosphinine ring is conditions but it disproportionates to give the cationic complex [Au(4) 2 ][GaCl 4 ] (9) and colloidal gold deposition. The formation slightly reduced as a result of the poor π-back bonding ability of the AuCl fragment. The same phenomenon is observed in of 9 has been ascertained by treating 8 with one equivalent of ligand 4. Additionally, 9 can also be obtained in a the cationic complex [Au(1) 2 ][GaCl 4 ] (3) which was readily prepared by reaction of two equivalents of 1 with [AuCl(SMe 2 )] straightforward fashion by treating two equivalents of 4 with [AuCl(SMe 2 )] followed by treatment with GaCl 3 at low followed by treatment with GaCl 3 at low temperature. Reaction of 2,6-bis(phenylethynyldimethylsilyl)phosphinine ( ) with the temperature. The structure of 9 has been elucidated. Despite a particular arrangement of the alkyne groups which encapsulate same precursor leads similarly to the complex [AuCl(4)] (5). Interestingly, this complex dimerizes upon crystallization to the gold coordination sphere, no gold-alkyne interactions are visible. give the bis(phosphabarrelene) complex 6, also structurally 11 are rather rare. Indeed, whereas some derivatives of cop-

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