Diversified Aggregation States of Phospholyl Lithiums

Studies on the aggregation states of phospholyl lithiums are of great importance and demand due to their applications as ligands in coordination chemistry. In this paper, we report that the solid-state structures of phospholyl lithiums with different substituents (2a,b, R1 = Ph, R2 = TMS; 3a,b, R1 = Me, R2 = TMS; 4, R1 = R2 = Et) could be in the form of a monomer, dimer, and coordination polymer, respectively. These phospholyl lithiums can change to monomeric structures (5, R1 = Ph, R2 = TMS; 6, R1 = Me, R2 = TMS; 7, R1 = R2 = Et) when the lithium cations are chelated by 12-crown-4.