complex 2 displays a weak emission at 381 nm (exc. 330 nm)
appearing at fairly similar energy (350 nm) than the precursor
gold complex NBu4[Au(3,5-C6F3Cl2)2]. This fact as well as the
high energy values found, allows us to assign this emission to
arise from p–p* transitions in the perhalophenyl rings.
Ab initio calculations are currently in progress in order to study
the nature of both the metallophillic interactions and the 2c–3e−
bridges responsible for this unusual Au · · · Ag4 arrangement.
The D.G.I. (MEC)/FEDER (CTQ2004-05495) project is ac-
knowledged for financial support. M. Monge thanks the MEC-
Universidad de La Rioja for his research contract “Ramo´n y
Cajal”. M. Montiel thanks the C.A.R. for a grant.
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Notes and references
‡ Crystal data for 2: C54H72Ag4AuCl4F21N2O10, monoclinic, P21/n, a =
◦
˚
19.2046(2), b = 17.4577(2), c = 24.2007(3) A, b = 101.637(1) , V =
7946.95(16) A , Z = 4, l = 3.038 mm−1, 75235 reflections, 2hmax
3
˚
56◦, 16737 unique (Rint = 0.0441), R = 0.0512, Rw = 0.1492 for 873
parameters, 211 restrictions, S = 1.046, max. Dq = 3.225 e A−3. Crystal
˚
data of 2 were measured at −100 ◦C using a Nonius KappaCCD
diffractometer, Mo-Ka radiation, x and φ-scans. The structure was
solved by direct methods and refined anisotropically on F2 (program
SHELXL-97, G. M. Sheldrick, University of Go¨ttingen) Absorption
correction: multiscan. Special refinement details: the structure contains
extensive regions of badly resolved residual electron density, in which no
solvent molecules could be clearly identified. For this reason no solvent
was included in the refinement, and the formula and related information
(M, etc.) do not include solvent. CCDC reference number 254889. See
http://www.rsc.org/suppdata/dt/b5/b502701m/ for crystallographic
data in CIF or other electronic format.
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´
´
´
15 X. L. Lu, W. K. Leong, L. Y. Goh and A. T. S. Hor, Eur. J. Inorg
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1 1 6 4
D a l t o n T r a n s . , 2 0 0 5 , 1 1 6 2 – 1 1 6 4