Synthesis and structural characterization of silver (I)-(D-, L- and DL-) aspartate and silver (I)-(D- and L-) glutamate coordination polymers

• Main Author: Zhang Yongtao
• Other Authors: Zheng, Zhiping
• Language: en_US
• Published: The University of Arizona. 2017
• Online Access: http://hdl.handle.net/10150/626799; http://arizona.openrepository.com/arizona/handle/10150/626799

Chiral assemblies of metal atoms linked by organic ligands are attracting considerable attention for their unique structural aesthetics and interesting properties. In order to explore the novel helical supramolecular of silver with amino acid complexes and develop the potential applications of them, the silver nitrate and two types of amino acid (L-, D- and DL-) aspartic acid and (L- and D-) glutamic acid are used to generate chiral silver(I) coordination polymers. In this work, five coordination polymers, {[Ag3(D-Asp)2(NO3)]}n. nH2O (1), {[Ag3(L-Asp)2(NO3)]}n. nH2O (2), {[Ag4(DL-Asp)2(NO3)2]}n.2nH2O (3), {[Ag4(D-Glu)2(NO3)2]}n· 2nH2O (4) and {[Ag4(L-Glu)2(NO3)2]}n· 2nH2O (5) are synthesized under hydrothermal conditions. The X-Ray Diffraction and related software were used for measuring and analyzing the crystal structures. X-ray single crystal structure analysis shows that the complexes (1) and (2) are a pair of six-helix bundle with a helical pitch of 70.6 Å. The adjacent helices are connected by argentophilic Ag-Ag interactions to form sextuple. The D-Asp and L-Asp in complex (3) generate achiral layers. Moreover, the L-Glu ligands in complexes (4) and D-Glu ligands in (5) combine with Ag(I) ions, and both the two structures have no charity. However, complex (4) and (5) are a pair of 3D structural enantiomer.