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Updated: Jun 1, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
Published on: April 28, 2014
Poly[[diaquadi-μ-dicyanamido-nickel(II)] bis-(pyridinium-4-olate)]
1College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, People's Republic of China.
Abstract:
The title compound, {[Ni(C(2)N(3))(2)(H(2)O)(2)]·2C(5)H(5)NO}(n), is a centrosymmetric two-dimensional coordination polymer with a layer (4,4) network structure. The asymmetric unit is compossed of an Ni(II) atom, which sits on an inversion center, a μ-1,5-bridging dicyanamide anion, a water mol-ecule, and a free 4-hydroxy-pyridine mol-ecule present in the zwitterionic pyridinium-4-olate form. The Ni(II) atom is coordinated in a slightly distorted N(4)O(2) octa-hedral geometry by four bridging dicyanamide ligands and two trans water mol-ecules. In the crystal, the two-dimensional networks are linked via N-H⋯O and O-H⋯O hydrogen bonds, forming a three-dimensional network.
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Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...