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Li P, Ahrens B, Bond AD, Davies JE, Koentjoro OF, Raithby PR, Teat SJ: A new series of dinuclear Au (I) complexes linked by diethynylpyridine groups. Dalton Trans. 2008 Mar 28;(12):1635-46. Epub 2008 Jan 24.
A series of novel digold complexes incorporating ethynyl pyridine derivatives as a spacer unit, [(R (3) P) Au (C [triple bond] C) X (C [triple bond] C) Au (PR (3))] (R = Ph, X = 2,5-pyridine (1); R = Cy (cyclohexane), X = 2,5-pyridine (2); R = Ph, X = 2,6-pyridine (3); R = Ph, X = 2,5'-bipyridine (4); R = Ph, X = 2,6'-bipyridine (5)), has been synthesised. All the complexes have been characterised spectroscopically and the structures determined by single-crystal X-ray crystallography. The central (C [triple bond] C)(X)(C [triple bond] C) unit is essentially linear for complexes 1, 2 and 4 and kinked for complexes 3 and 5, but only in 1, with the shortest spacer group and the less bulky phosphine ligand, is there evidence of d (10)...d (10) Au...Au interactions (Au-Au 3.351 (2) A). The solution UV/visible absorption and emission spectra for all the complexes are similar to those of the free ligands suggesting that the spectra are dominated by pi-pi* ligand-centred transitions and this is confirmed by DFT calculations. |
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