Abstract
Thorium(IV) nitrate and thiocyanate react with the bidentate heterocyclic aldimines (PyAlA) and heterocyclic ketimines (AcPyA) to form yellow., brown- or violet-coloured complexes [Th(SB)X 4] (SB = PyAlA or AcPyA; X = NO 3, NCS). The thiocyanato complexes contain N-bonded isothiocyanato groups and are six-coordinated. The nitrato complexes contain bidentate nitrato groups and are ten-coordinated. All the complexes have been characterised by analytical data, conductivity in non-aqueous media, IR spectra and thermogravimetric studies. From the thermogravimetric measurements of these complexes, it is seen that the thiocyanato complexes are comparatively more stable at higher temperature. Most of the nitrato complexes undergo rapid exothermic decomposition around 200 °C in a single step, whereas the isothiocyanato complexes decompose in a stepwise manner ultimately forming stable ThO 2 as the end product.
Published Version
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