四核钴羰基簇合物CO_4(CO)_8(μ-CO)_2(μ_4-PSR)_2的合成和晶体结构

Syntheses and Crystal Structure of Tetracobalt Carbonyl Clusters Co_4(CO)_8(μ-CO )_2 [μ_4-PSR]_2

通过Co_2（CO）_8与二气烧流基酸RSPCI_2［R＝－CH_3－C_2H_5，－C（CH_3）_3，－（CH_2）_4H_3］反应，得到4个新簇合物．除用元素分析、IR、~1HNMR和MS表征其结构外，还用X光衍射法测定了侯会物CO_4（CO）_8（μ-CO）_2（μ_4－PSR）_2小的单品结构该簇合物用单斜晶系，P21／C空间群．晶胞参数为α＝8．445（3），b＝8．562（3），c＝17．125（6），β＝104．26（3）°；V＝1200．1A3；Dc＝1．9379cm^3μ＝3．058mm^(－1)；F（000）＝688．结构分析表明，四个Co原子形成平面矩形，两个PSR四重桥基分别在四钻平面上下盖帽构成Co_4P_2类人面体骨架，骨架为D_(2h)点群对称性．PSR配体为4e供体，与四个钴原子成键．

The title compounds Co4(CO)8(μ-CO)2 (μ4-PSR) [R=-CH3, -C2H5, -C(CH3)3,-(CHa)4CH3] were synthesized by the reaction of Co2(CO)8 with RSPCl2. They were characterized by IR, 1HNMR, elemental analysis. The crystal and molecular structure of Co4(Co)8(μ-CO)2 (μ4-PSC2H5) has been determined by single crystal dunaction method.Crystal data: monoclinic, space group P21 /c, with a=8-445(3), 6=8.562(3), c= 17.125(6)A, β=104.26 (3)' 9 V=1200.1A3, Z=2, Dc=1.937gcm-3. Its molecular structure contains an octahedral Co4P2 skeleton which consists of a rectangular four cobalt atoms core and the Co4 core is capped above and below by two quadruply bridging PSR ligands.