| Abstract: 13 1,10-Phenanthroline N-oxide chelates of rare earth (M) dodecahy-drododecaborates have been synthesized by the reactions among rare earth oxides (Ln2O3) or rare earth hydroxides [Ln(OH)3], dodecahydrododec-aboric acid (H2B12H12) and 1,10-Phenanthroline N-oxide (PhenO). The chelates have been examined by elemental analyses, IR spectra and electro-conductance measurements. They have the following formula [Ln(PhenO)4]2 (B12H12)3·nH2O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; n = 3-6).The thermal behaviour of these chelates have been studied to a limited extent by DTA-TG. The thermal graphs reveal that all the chelates decompose exothermically, and the thermal stability of the chelates of the weighty rare earth is better than light and middle on the whole. The decompostion process of the chelates has been guessed by the thermogravi-metric experiments. |
