Utility of tris(4-bromopyridyl) europium complexes as versatile intermediates in the divergent synthesis of emissive chiral probes?

Stephen J. Butler; Martina Delbianco; Nicholas H. EvansAndrew T. FrawleyRobert PalDavid ParkerRobert S. PuckrinDmitry S. Yufit

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Utility of tris(4-bromopyridyl) europium complexes as versatile intermediates in the divergent synthesis of emissive chiral probes?

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The synthetic utility of europium complexes with three coordinated 4-bromopyridyl groups for chromophore elaboration has been assessed in palladium-catalysed Sonogashira coupling reactions, and in copper(I) mediated click reactions of the triazide derivative, generated in situ. The crystal structure of the Eu complex of a p-OMe-phenyl substituted triazole at 100 K is reported in which the pendant triazole sensitising moieties interdigitate in the solid-state lattice. The triazole complex can be separated into Δ and Λ enantiomers by chiral HPLC but is weakly emissive in methanol (ε 5.5 mM~(?1) cm~(?1); λ_(exc) 320 nm; φ 0.2), contrasting with a set of four alkynyl-aryl derivatives which are one thousand times brighter and absorb strongly with broad absorption maxima in the range 332 to 360 nm. An enantiopure europium complex gives an intense CPL signal in solution that is the strongest yet reported.

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《Dalton transactions: An international journal of inorganic chemistry》 |2014年第15期|5721-5730|共10页
作者
Stephen J. Butler; Martina Delbianco; Nicholas H. EvansAndrew T. FrawleyRobert PalDavid ParkerRobert S. PuckrinDmitry S. Yufit;
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Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK;

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正文语种英语
中图分类化学;无机化学;
关键词
palladium-catalysed; Sonogashira; p-OMe-phenyl;

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Utility of tris(4-bromopyridyl) europium complexes as versatile intermediates in the divergent synthesis of emissive chiral probes?

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