Synthesis and optical spectroscopy of linear long-chain di-terminal alkynes and their Pt–σ-acetylide polymeric complexes

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Abstract
A variety of straight-chain alkynes with extended π-conjugation through benzene, anthracene and thiophene linker units in the backbone, H—CC—R′—CC—R—CC—R′—CC—H (R =p-C6H4, 9,10-C14H8, 2,5-C4H2S; R′=p-C6H4, p-C6H4-C6H4-p) has been synthesized. The alkynyl chromophores with an anthracene spacer unit are highly emissive in solution with luminescence quantum yields of up to 0.5. The platinum σ-acetylide polymeric complexes of the above ligands show strong absorptions associated with metal-to-alkynyl ligand charge transfer (MLCT) transitions. It is clear that the π-conjugation is maintained through the metal centres and the optical gap for the polymer, [graphic omitted]Pt(PBun 3)2-CC-p-C6H4-CC-9,10-C14H8-CC-p-C6H4-CC[graphic omitted]n is lower than for the complexes [graphic omitted]Pt(PBn 3)2-CC-R′-CC-R-CC-R′-CC[graphic omitted]n(R =p-C6H4, 2,5-C4H2S; R′=p-C6H4; p-C6H4-C6H4-p).