新型二维七核簇合物[WS~4Cu~6Br~4(Py)~4]的合成及晶体结构

标题化合物是通过(NH~4)~2WS~4，CuBr和(n-Bu)~4NBr的低热固相反应，其固相产物的乙腈溶液和吡啶发生取代反应来合成的。此簇合物为四方晶系，空间群I4 2d，晶胞参数：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，最终偏差因子R=0.040。X射线单晶衍射法证实由六个Cu原子所组成的稍畸变的八面体，包围着近似正四面体的WS~4核，形成WS~4Cu~6单元，通过-Cu~e~q-Br-Cu~e~q-桥，此单元连接其最近的另一个单元，形成一个二维网络结构。

Synthesis and crystal structure of a novel two- dimensional heptanuclear cluster compound [WS~4Cu~6Br~4(Py)~4]

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.