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合成了混合配体配合物单晶 [Pd(bpy) (L asp) ]·3 .5H2 O (bpy =2 ,2′ 联吡啶 ,L asp2 -=L 天冬氨酸根 ) .用红外光谱和元素分析对配合物的成键及组成进行了表征 .用X射线单晶衍射仪 (CCD)测定了配合物的结构 ,晶体属四方晶系 ,为P4( 1) 2 ( 1) 2空间群 .配合物为平面四边形结构 ,分子内存在氢键作用 ,其晶胞靠氢键和芳环堆砌等弱相互作用力形成 .用电位滴定法测定了配合物稳定常数lgK[Pd2 + +bpy +L asp2 Pd(bpy) (L asp) ]、表征常数ΔlgK[Pd(bpy) 2 + Pd(L asp)Pd(bpy) (L asp) +Pd2 + ]和lgX[Pd(bpy) 2 + 2 +Pd(L asp) 2 -2 2Pd(bpy) (L asp) ] ,各常数均大于相应的统计期望值 ,从分子内d pπ电子效应和电性中和角度对配合物额外稳定性进行了讨论
The complex ligand complexes were synthesized by single-crystal [Pd (bpy) (L asp)] · 3.5H2O (bpy = 2, 2’bipyridyl, L asp2 - = L aspartate) The coordination and the composition of the complexes were characterized by X-ray single crystal diffraction (CCD). The crystal structure of the complexes is tetragonal and P4 (1) 2 (1) 2 space group. The material has a planar tetragonal structure, and hydrogen bonds are formed in the molecule, and the unit cell is formed by weak interaction such as hydrogen bonding and aromatic ring packing. The stability constant lgK [Pd2 + + bpy + L asp2 The constants ΔlgK [Pd (bpy) 2 + Pd (L asp) Pd (bpy) (L asp) + Pd2 +] and lgX [Pd (bpy) 2 + 2 + Pd L asp) 2 -2 2Pd (bpy) (L asp)], each constant is larger than the corresponding statistical expectation, and the additional stability of the complex is discussed from the perspective of dpπ electron effect and electrical neutralization