680
R. Schmidt et al. · Tribromo(2-phenyl-1,8-naphthyridine)gold(III)
˚
shorter by 0.335 and 0.358 A than the average Br–Au there appear to be intermolecular interactions with dis-
˚
bond length.
tances of 3.5185 and 3.5937 A between Au1···Br51
The angles between the least-squares planes of and Au51···Br1 atoms, respectively. This interaction
the naphthyridine rings N1/N2 and N51/N52 and in the range of the sum of the van der Waals radii
˚
the phenyl rings C8/C13 and C58/C63 are 21.2(5) (3.51 A) [16] allows for the formation of dimers in
and 22.4(5)◦, respectively, indicating a somewhat less the crystal structure between two non-symmetry re-
than optimum π/π conjugation between both systems. lated gold complex molecules (Fig. 2), a feature which
On the other hand, the dihedral angles ω between the has been observed before in related gold(III) com-
naphthyridine plane and the corresponding AuBr3N pounds [17].
planes are 105.9(2)◦ and 105.2(2)◦, respectively, re-
flecting a sterically induced near-orthogonality.
Acknowledgements
The shortest intermolecular Au···Au distance
This work has been supported by a DAAD fellowship
to R. S. We thank FONDECYT (Project 1085135) for their
financial support.
˚
is 4.2026(7) A, confirming the lack of any significant
interaction between the metal centers. Nevertheless,
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Unauthenticated
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