由Pb-O螺旋链构筑具有罕见ecl拓扑结构的铅髤配位聚合物

A 3D Lead(Ⅱ) Coordination Polymer Containing Helical Chains with Rare ecl Topology

0引言螺旋是自然界普遍存在的现象,同时,螺旋性还是一种特殊的手性,在自然界和生命体中大量蕴藏,螺旋的研究在生命科学、药学和材料科学中起到了重要的作用。当前,具有螺旋特征的化合物的研究已经成为化学研究的热点和前沿领域之一．

Under hydrothermal condition,a novel coordination polymer [Pb（C4H4O6）]n has been successfully synthesized by reaction flexible racemic ligand D,L-tartaric acid（C4H4O6） and Pb（II）（NO3）2.Its structure is determined by single-crystal X-ray diffraction analysis and further characterized by X-ray powder diffraction,IR,CHN and TG analyses.It crystallizes in tetragonal,space group I41/acd with a=1.569 0（2） nm,c=1.009 5（2） nm,V=2.485 0（7） nm3,Z=16.Its structure contains left-and right-handed helical chains.Such helical chains with opposite chirality are alternatively arranged and further connected to form a three-dimensional framework.Topology analysis shows that it presents rare ecl topological structure.CCDC： 771026.