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needle-shaped colorless crystal. Unit cell dimensions
were derived from the SET4 setting angles of 25 reflec-
tions in the range 10.55BUB13.85°. Data were cor-
rected for absorption following the semi-empirical
psi-scan correction technique [39] (transmission range
0.674–0.966) using PLATON/ABSP [40].
The structure was solved by automated Patterson
techniques using DIRDIF96 [41] and refined on F2 using
SHELXL96 [42]. Hydrogen atoms were taken into ac-
count at calculated positions and refined riding on their
carrier atoms. A final Fourier difference map showed
no significant features other than some residual absorp-
tion artifacts near Hg. Numerical details have been
collected in Table 5. All geometrical calculations and
the illustrations were done with PLATON [40].
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Acknowledgements
This work was supported (N.R., A.L.S.) by the
Netherlands Foundation for Chemical Research (SON)
with financial aid from the Netherlands Organisation
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