Eight non-molecular phenyl- and methyl-phosphonates and ethylenediphosphonates of thorium and cerium, namely, Th(O3PC6H5)2·H2O (1), Th(O3PCH3)2·H2O (2), Th(O3P(CH2)2PO3)·H2O (3), Ce(O3PCH3)(HO3PCH3) (4), Ce(O3P(CH2)2PO3H) (5), Th(O3PCH3)F2 (6), Th(O3P(CH2)2PO3H)F·H2O (7), and Ce(HO3PCH3)2F2 (8), were synthesized by hydrothermal reactions and characterized by single-crystal X-ray diffraction, spectroscopic, thermal and magnetic susceptibility studies. They have layered, pillared-layered and one-dimensional structures containing 7-9 coordinated metal ions. The 31P and 13C solid-state MAS NMR spectroscopic data of compounds 1-5 are in accordance with their single-crystal X-ray structures. The compounds 1-3 lose their water of crystallization at temperatures as low as 60 °C while the compounds 4-6 and 8 remain stable up to at least 270 °C. The magnetic susceptibility measurements of compounds 4 and 5 corroborate the Ce3+ oxidation state.
Mehra et al. (Thu,) studied this question.