Patent ID: 7074505

Claim:
A lanthanide compound comprising one of Formulae IX-A through IX-C below: [Ln(Î²-enolate) 3 ] 1 (trisphosphine trioxide) 1 (XI-A) [Ln(Î²-enolate) 3 ] 2 (trisphosphine trioxide) 1 (XI-B) [Ln(Î²-enolate) 3 ] 3 (trisphosphine trioxide) 1 (XI-C) where: in Formulae (XI-A), (XI-B), and (XI-C): trisphosphine trioxide has Formula II Q x P(O)-(LG-P(O) r Q 2 ) y (II) where in Formula II, x is 1, y is 2, and r is 1; such that: in Formula II: Q is the same or different at each occurrence and is selected from C 6 H n F 5âˆ’n , and C m (H+F) 2m+1 , m is an integer from 1 to 12, and n is 0 or an integer from 1 to 5, LG is the same or different at each occurrence and is a linking group selected from C m (H+F) 2m , wherein m is an integer from 1 to 12, and arylene, cyclic heteroalkylene, heteroarylene, alkyleneheteroarylene, ferrocenediyl, and o-carboranediyl.