Syntheses, spectroscopic and thermal analyses of the hofmann-type metal(II) tetra- cyanonickelate(II) pyridazine complexes: {[M(pdz)Ni(CN)4]∙H2O}n (M = Zn(II) or Cd(II))

D Karaağaç,G S Kürkçüoğlu

doi:10.4314/bcse.v29i3.9

Abstract

Two new Hofmann-type complexes in the form of {[M(pdz)Ni(CN)4]·H2O}n [where pdz = pyridazine; M = Zn(II) and M = Cd(II)] have been synthesized as a powder and their structural properties have been characterized by vibrational (FT-IR and Raman) spectroscopy, thermal and elemental analysis. The spectral and thermal analysis results suggest that these complexes are similar in structure to the Hofmann type complexes and their structures consist of polymeric layers of │M−Ni(CN)4│∞ with the pdz bound to the metal (M) atom. KEY WORDS: Hofmann-type complexes, Vibrational spectra, Pyridazine, Tetracyanonickelate(II), Thermal analysis Bull. Chem. Soc. Ethiop. 2015, 29(3), 415-422. DOI: http://dx.doi.org/10.4314/bcse.v29i3.9

Highlights

Cyano-bridged complexes have been shown to form polymeric structures by studies over the last few decades
Cyano-bridged polymeric complexes structurally contain chains oriented in one dimension
The vibrational spectra of Zn–Ni–pdz and Cd–Ni–pdz complexes are shown in Figures 1 and 2, respectively

Summary

Introduction

Cyano-bridged complexes have been shown to form polymeric structures by studies over the last few decades These polymeric metal complexes are especially macromolecules formed by metal–metal or metal–ligand–metal bridge connections in one, two or three dimensions. Functional polymeric cyanide complexes can be prepared with mono-, di- or polydentate ligands These types of materials are packed to form crystal structures due to bridging groups and intermolecular interactions. The square-planar [Ni(CN)4]2moiety may take a number of catenation modes to build up multidimensional structures Based on this structure, metal(II) tetracyanonickelate(II) complexes have been developed using Ndonor ligands such as ammonia [4], pyridine [5], O-donor ligands such as water [6], dioxane [7] and S-donor ligands as N,N-dimethylthioformamide [8]

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Conclusion