Saccharinato complexes of Ce(V) with 2-hydroxypyridine: Synthesis, spectroscopic and thermal characteristics of {[}Ce(sac)(2)(SO4)(H2O)(4)] and {[}Ce(sac)(2)(SO4)(PyOH)(2)]

The synthesis of Ce(IV) complexes {[}Ce(sac)(2)(SO4)(H2O)(4)] (1) and {[}Ce(sac)(2) (SO4)(PyOH)(2)] (2) (sac = saccharinate, PyOH = 2-hydroxypyridine) starting with sodium saccharinate is described. Their vibrational and nuclear magnetic resonance (H-1, C-13) spectra as well as their thermal mode of degradation were investigated. The data indicate that sac in complex I behaves as a monodentate ligand through the nitrogen atoms. Saccharinato ligand in complex 2 shows different mode of coordination, where it behaves as tridentate and binds Ce(IV) through its carbonylic oxygen, nitrogen and sulphonylic oxygen atoms. The most probable structure in complex 2 is that, units {[}Ce(sac)(2)(SO4)(PyOH)(2)] are linked by bridges of the O- of sac sulphonyl leading to polymeric chains. (C) 2007 Elsevier B.V. All rights reserved.