Patent ID: 7074504

Claim:
A lanthanide compound comprising one of Formulae XII-A and XII-B below: Ln(Î²-enolate) 3 (bisphosphine oxide-sulfide) 1 (XII-A) Ln(Î²-enolate) 3 (bisphosphine oxide-sulfide) 2 (XII-B) where: in Formulae (XII-A) and (XII-B): bis-phosphine oxide-sulfide has Formula III Q 2 P(S)-LG-P(O)Q 2 (III) such that: in Formula III: 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, arylene, cyclic heteroalkylene, heteroarylene, alkyleneheteroarylene, ferrocenediyl, and o-carboranediyl.