Journal of the Chemical Society, Dalton Transactions p. 1867 - 1872 (1994)
Update date:2022-08-05
Topics:
Hong, Xiao
Cheung, Kung-Kai
Guo, Chun-Xiao
Che, Chi-Ming
The complexes a=8.524(2), b=15.227(2), c=15.525 Angstroem, α=91.07(1), β=92.06(1), γ=94.28(1) deg; 2, monoclinic, space group P21/n, a=12.201(3), b=13.014(5), c=16.329(4) Angstroem, β=94.11(2) deg; 3, monoclinic, space group C2/c, a=16.688(3), b=10.468(1), c=17.899(2) Angstroem, β=97.70(1) deg.The intramolecular Au...Au distances in 2 and 3 are 3.251(1) and 3.154(1) Angstroem respectively.Extended-Hueckel molecular orbital calculations showed that the highest occupied molecular orbital of 3 is a combination of d?* and dδ*, whereas its lowest unoccupied molecular orbital is the ?* of the co-ordinated phenyl group.The UV/VIs absorption spectra of 2 and 3 show intense absorptions at around 290-300 nm, which are assigned as Au(d?*,dδ*) -> ?* (Ph,dppm) in nature.Both 2 and 3 show luminescence in fluid solution at room temperature.The emmission properties of 3 have been examined in detail.Complex 4 shows a well resolved vibronic structured emission at 400-600 nm in dichloromethane at room temperature, arising from the 3*> excited state of C2(2-).
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