Abstract
The yellow complexes (Me4N)2Cu5(SPh)7 and (Me4N)2Ag5(SPh)7, soluble in aprotic solvents, have been
synthesized. Crystal structure results are: (Me4N)2Cu5(SPh)7, a 12.250(1), b 20.151(4), c 11.531(2)
Ǻ, α 103.50(1), β 90.01(1), γ 83.20(1), space group Pī, Z 2, 3639 reflections (Mo Kα),
full anisotropic refinement, R 0.051; (Me4N)2Ag5(SPh)7, a 12.393(1), b 20.633(4), c 11.674(1)
Ǻ α 103.88(1), β 90.35(1), γ 82.96(1)°, space group Pī, Z 2, 6400 reflections (Mo Kα),
full anisotropic refinement, R 0.030. The crystals are isostructural. ��� The crystals contain a molecular cluster [M5(SPh)7]2-, the structure of which may
be visualized in terms of the array of metal atoms which is formed by addition
of a unique fifth metal atom over one elongated edge of an approximate
tetrahedron of metal atoms. Benzene thiolate ligands bridge the seven edges of
the resulting polyhedron of metal atoms. The four metal atoms derived from the
tetrahedron possess approximately trigonal planar coordination, while the
unique metal atom has approximately linear (S-M-S 175.2° (Cu), 176.0° (Ag))
digonal coordination. There is no evidence of strong metal-metal bonding in the
M5S7 core, which has very approximate C2v
symmetry. Average bond lengths are Cudig-S, 2.160; Cutrig-S,
2.270; Agdig-S, 2.361; Agtrig-S, 2.502 Ǻ.