Synthesis and thermotropic behaviour of bis(imidazolium) salts bearing long-chain alkyl-substituents and of the corresponding dinuclear gold carbene complexes

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Abstract

New propylene bridged bis(imidazolium) salts bearing at the wingtip positions a benzyl group functionalisedwith one or two long alkyl chains, as well as the corresponding dinuclear N-heterocyclicdicarbene gold(I) complexes of general formula [Au2(RIme(CH2)3eImR)2](X)2 (X ¼ Br, PF6, BF4) havebeen synthesised and thermally characterised. All the compounds are stable up to 200 C and thebis(imidazolium) salts [H2(RIme(CH2)3eImR)](X)2 (X ¼ Br, PF6) behave as thermotropic liquid crystals inthe temperature range 100e200 C. By contrast, only the gold(I) diNHC complexes with eight aliphaticchains present mesomorphism, whereas those with four chains show numerous crystalline phases withstructural disorder and presumably modified AueAu distances, as indicated by solid state emissionproperties.

Autore Pugliese

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  • Baron M.; Bellemin-Laponnaz S.; Tubaro C.; Heinrich B.; Basato M.; Accorsi G.

Titolo volume/Rivista

Journal of organometallic chemistry

Anno di pubblicazione

2016

ISSN

0022-328X

ISBN

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Settori ERC

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Codici ASJC

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