Abstract
A new 1,3-oxathiolane-based ligand, 2-(1,3-oxathiolan-2-yl)pyridine, was prepared and its coordination to lead(II) was investigated. Experiments revealed a ligand-breaking reaction during the complexation process, which leads to the formation of a 2D-coordination polymer of lead(II), [Pb(μ
3-HME)(μ-OAc)]
n
; H2ME: 2-mercaptoethanol. The compounds have been characterized by elemental analysis, FT-IR, 1H NMR spectroscopy and single-crystal X-ray diffraction. X-ray analysis revealed a 2D-coordination polymer extending via acetato bridges. The lead(II) center adopts a rare PbO4S3-distorted pentagonal bipyramidal geometry with a hemidirected arrangement. Upon coordination, the thiol group of the H2ME ligand is deprotonated to coordinate as an anionic ligand. The network extends in sheets in the crystallographic ab plane via Pb–S–Pb and Pb–O–Pb bridges, aided by O–H⋯O hydrogen bonds.
摘要:制备了一种新的1,3-噻吩基配体,2-(1,3-噻吩-2-基)吡啶,并研究了其与铅(II)的配位。实验揭示了在配合过程中发生了配体断裂反应,导致了铅(II)的二维配位聚合物的形成,[Pb(μ3-HME)(μ-OAc)]n; H2ME: 2-巯基乙醇。通过元素分析、FT-IR、1H NMR光谱和单晶X射线衍射对化合物进行了表征。X射线分析揭示了一个通过乙酸盐桥扩展的二维配位聚合物。铅(II)中心采用了一种罕见的PbO4S3-畸变五角双锥几何结构,具有半定向排列。在配位过程中,H2ME配体的巯基被去质子化,以作为负离子配体进行配位。网络通过Pb-S-Pb和Pb-O-Pb桥接在晶体学的ab平面上扩展成片,辅助O-H⋯O氢键。