Poly[di-μ9-citrato-tetrasodiumzinc]

• Main Authors: Pi-Zhuang Ma, Jing-Tuan Hao, Hong-Wei Yang, Yu-Hong Ma, Ting Yao
• Format: Article
• Language: English
• Published: International Union of Crystallography 2013-12-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536813030067

In the title compound, [Na4Zn(C6H5O7)2]n, the ZnII ion lies on an inversion center and is coordinated by six O atoms from two citrate ligands, forming a distorted octahedral geometry. There are two crystallographically independent Na+ cations in the asymmetric unit. One Na+ cation exhibits a distorted square-pyramidal geometry defined by five O atoms from four citrate ligands. The other Na+ cation is surrounded by six O atoms from five citrate ligands in a distorted octahedral geometry. The Na+ cations are bridged by citrate carboxylate groups, forming a layer parallel to (100). The layers are further assembled into a three-dimensional network with the [Zn(citrate)2]4− building units as `pillars'; O—H...O hydrogen bonds also stabilize the structure.