Characterisation and electronic properties of some inorganic ion exchangers of the zirconium phosphate type containig transition-metal ions
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 20,p. 2115-2120
- https://doi.org/10.1039/dt9760002115
Abstract
A series of transition-metal-ion forms of crystalline zirconium phosphate of general formula ZrM(PO4)2·4H2O (M = ZnII, CuII, NiII, CoII, and MnII) has been characterised. The visible–near U.V. spectra of the copper, nickel, and cobalt species indicate the presence of an octahedral stereochemistry (tetragonally distorted in the case of CuII). The dehydration of the exchangers has been followed using thermal and X-ray powder techniques and electronic spectra. Magnetic-susceptibility measurements have also been used (where possible) to support structural assignment. Complete dehydration occurs only atca. 450 °C with a change in stereochemistry for the compounds of NiII and CoII. At higher temperature the layer structure is lost and the materials become double phosphates, MZr(PO4)2. Possible stereochemistries for the anhydrous forms are discussed.Keywords
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