The title compound [WS~4Cu~6Br~4(Py)~4] were obtained by the reaction of (NH~4)~2WS~4, CuBr and (n-Bu)~4NBr in the solidstate and pyridine substitution of the solid state product in acetonitrile. Its red crystal is tetragonal, space group I4 2d with unit cell parameters α=1.4612(2)nm, c=1.5125(3)nm, V=3.2300(3)nm^3, Z=4, μ=126.90cm^-^1, D~c=2.73g/cm^3, F(000)=2479, R=0.040 for 560 observed reflections. The X-ray analysis confirms that the structure, which possesses acrystallo- graphic 4 symmetry axis running through Br(1), Cu(1), W, Cu(1a), Br(1a) atoms, consists of a tetrahedral WS~4 core envelopedby an octahedral array of six copper atoms, forming an WS~4Cu~6 aggregate. Linked by -Cu~e~q-Br-Cu~e~q-bridges, this aggregate connects with its nearest, neighbours and develops a two-dimensional network.

Key words: CRYSTAL STRUCTURE DETERMINATION, X-RAY DIFFRACTION ANALYSIS, PYRIDINE, COPPER COMPLEX, TRIPHENYLPHOSPHINE, CLUSTER COMPOUND, TWO-DIMENSIONAL, POLYNUCLEAR COMPLEX, SULFIDE COMPLEX, SOLID PHASE REACTION