Half-sandwich bis(propiolamidinate) rare-earth metal complexes: Synthesis, structure and dissociation of the cyclopentadienyl ligand via competition with an amidinate

摘要

A comparative study on the stabilizing ability between C_5Me _4(SiMe_3) (Cp' for short) and amidinate in rare-earth metal complexes is investigated. Cp' is found to dissociate from half-sandwich bis(propiolamidinate) lanthanides via competition with a propiolamidinate, which clearly shows that the coordinative ability of chelate amidinate is stronger than that of η~5-Cp' under the present conditions.