Patent ID: 6875523

Claim:
A lanthanide compound having one of Formulae IX-A and IX-B below: Ln(β-enolate) 3 (monophosphine oxide) 1 (IX-A) Ln(β-enolate) 3 (monophosphine oxide) 2 (IX-B) where: in Formulae (IX-A) and (IX-B): monophosphine oxide has Formula I: O 2 P(O)—Z (I) such that: Q is the same or different at each occurrence and is selected from C 6 H n F 5−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, and Z is selected from Q and pyridiyl, with the provision that when Z is Q, there is at least one F substituent on at least one Q group.