Alteration of the aurophilic interactions in trimeric gold(I) compounds through charge transfer. Behavior of solvoluminescent Au-3(MeN=COMe)(3) in the presence of electron accepters
Mm. Olmstead et al., Alteration of the aurophilic interactions in trimeric gold(I) compounds through charge transfer. Behavior of solvoluminescent Au-3(MeN=COMe)(3) in the presence of electron accepters, J AM CHEM S, 123(14), 2001, pp. 3260-3267
The ability of the triangular gold(I) complex, Au-3(MeN=COMe)(3), which as
a solid displays the novel property of solvoluminescence (see: Vickery, J.
C.; Olmstead, M. M.; Fung, E. Y.; Balch, A. L,. Angew. Chem.. Int. Ed. Engl
. 1997, 36, 1179) to function as an electron donor has been demonstrated th
rough spectroscopic studies and isolation of crystalline adducts with organ
ic acceptor molecules. Four such adducts with nitro-9-fluorenones have been
isolated and subject to single-crystal X-ray diffraction study. These are
deep yellow {Au-3(MeN=COMe)(3)}. {2,3,7-trinitro-9-fluorenone}, red {Au-3(M
eN=COMe)(3)}. {2,4,5,7-tetranitro-9-fluorenone), red {Au-3(MeN=COEt)(3)}. {
2,7-dinitro-9-fluorenoe}, and red {Au-3(MeN=COMe)(3)). {2,4,7-tetranitro-9-
fluorenone}. The solid-state structures of {Au-3(MeN=COMe)(3)}. {2,4,7-tetr
anitro-9-fluorenone} and (Au3(MeN=COMe)3) (2,4,5,7-teuanitro-9-flu consist
of columns in which the planar gold(I) trimers and the nearly planar nitro-
9-fluorenones are interleaved with the gold trimers making face-to-face con
tact with the nitroaromatic portion of the electron acceptor. Thus the orga
nic accepters disrupt the aurophilic interactions present in crystalline {A
u-3(MeN=COMe)(3)} itself. However, in {Au-3(MeN=COEt)(3)}(2). {2,7 -dinitro
-9-fluorenone} and {Au-3(MeN=COEt)(3)}(2) (2,4,7-trinitro-9-fluorenone}, au
rophilic interactions are found which produce dimers, (Au-3(MeN=COEt)(3)}(2
), with nearly trigonal prismatic AU(6) cores. These dimers are interleaved
with the nitro-9-fluorenone molecules to again form extended columns in wh
ich the components make face-to-face contact. Despite the fact that the gol
d atoms in {Au-3(MeN=COMe)(3)} and {Au-3(MeN=COEt)(3)} are in exposed sites
and only two-coordinate, there is no evidence of additional coordination o
f the nitro-9-fluorenones with gold centers in the crystalline adducts.