摘要
膦桥过渡金属络合物和簇合物由于独特的结构特性和催化性能而引起人们的重视,许多这类的化合物已被合成和表征,但相应的银化合物的研究则较少。近年来,我们利用双齿膦配体dppm(Pb_2pCH_2PPh_2)和dppe(Ph_2PCH_2CH_2PPh_2)合成了一系列新型的膦配体银络合物。这些双齿膦配体结合硝酸根、氯离子和吡啶等配体以多种方式与银原子配位,呈现了丰富的配位结构特征。本文报导另一个新的dppe多核银络合物的合成与晶体结构测定的结果,讨论了其特殊的结构特征。
A new polynuclear silver complex with bridging diphorsphine ligand has been synthesized and characterized by :single cryatsl X-ray diffraction method The compound crystallizes in the triclinic space group P1 with a=12.7489, b=13.4715,c=14.7015;_α=59.747, β=63.949, γ=70.196°;V=1936.9~3.The simplest formularis [Ag_4· dppe)_3(NO_3)_4],Mr=1874.79,D_c=1.607 g·cm^(-3),Dm=1.62 g·cm^(-3), μ(MoKa)=11.69 cm^(-1), F(OOO)= 942. The structure was solved by conventional heavy-atom techniques and refined by full-matrix least squares to give diserepany indices of R=0.048 and RW=0.060(W=1/[σ(Fo)~2+(PWT*Fo)~2+QWT]-Fo) for 5052 reflections. An empirical absorption correction program DIFABS was performed.
Silver atoms are linked by bridging ligands of dppe and nitrate,forming a network extending in space. Each structural unit contains two binuelear subunits,of which silver atoms are bridged by nitrates. The two subunits are connected by one dppe ligand.Silvet atoms are not equivalent in subunit and one of the nitrates functions not only as a monodentate bridging ligand,but also as an asymmetric bidentate chelating lingand. All coordinate configurations of silver are shown as distorted tetrahedron.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第6期694-698,共5页
Acta Physico-Chimica Sinica
基金
青年自然科学基金
关键词
膦桥
多核
银
络合物
晶体结构
polynuclear silver complex with bridging dipborsphine, Crystal strueture
