Patent ID: 7087323

Claim:
A lanthanide compound comprising Formula (X-A) below: [Ln(β-enolate) 3 ] 1 (bisphosphine dioxide) 1 (X-A) where: in Formulae (X-A): bisphosphine dioxide has Formula II Q x P(O)-(LG-P(O) r Q 2 ) y (II) wherein Formula II, x is 2, y is 1, 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 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, 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; wherein β-enolate is selected from 2,4-pentanedionate; 1,3-diphenyl-1,3-propanedionate; 2,2,6,6-tetramethyl-3,5-heptanedionate; 7,7-dimethyl-1,1,1,2,2,3,3-heptafluoro-4,6-octanedionate; 1,1,1,3,5,5,5-heptafluoro-2,4-pentanedionate; and 1-phenyl-3-methyl-4-i-butyryl-5-pyrazolinonate.