Publication Date:
2013-08-14
Description:
A novel Cu–Na heteronuclear three-dimensional coordination polymer, poly[diaquadi-μ 5 -iminodiacetato-di-μ 4 -iminodiacetato-tricopper(II)disodium(I)], [Cu 3 Na 2 (C 4 H 5 NO 4 ) 4 (H 2 O) 2 ] n , has been prepared by hydrothermal synthesis. The asymmetric unit contains one and a half copper(II) cations, a sodium cation, two iminodiacetate (ida) ligands and a coordinated water ligand. One of the two independent Cu II centres is in a general position and is five-coordinated in a distorted square-pyramidal geometry. A [Cu(ida)] unit is formed via a bis-chelating ida ligand and the coordination sphere of the Cu II atom is completed by two O atoms of two different neighbouring [Cu(ida) 2 ] units. These [Cu(ida) 2 ] units are associated with the second Cu II cation, which is located on a crystallographic inversion centre and is coordinated in a distorted square-planar geometry by two chelating ida ligands. The carboxylate groups of the ida ligands act as bridges and connect the [Cu(ida)] and [Cu(ida) 2 ] building blocks in a 2:1 ratio, forming two-dimensional arrays. These layers are interconnected into a three-dimensional structure by the sodium ions. Each Na I cation is coordinated by six O atoms from five ida ligands and a water molecule. When [Cu(ida)], the Na I cations and [Cu(ida) 2 ] are viewed as 5-, 5- and 8-connected nodes, respectively, the three-dimensional network exhibits a (3 2 .4 3 .5 2 .6 3 ) 2 (3 2 .4 3 .5 2 .6 3 ) 2 (3 4 .6 16 .7 8 ) topology.
Print ISSN:
0108-2701
Electronic ISSN:
1600-5759
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
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