Patent ID: 7090931

Claim:
A lanthanide compound comprising Formula XIII below: Ln 2 (β-enolate) 6 (pyridine-N-oxide) 3 (XIII) where: in Formula (XIII): pyridine N-oxide has Formula IV, Formula V or Formula VI, such that: in each of Formulae IV through VI: Y is the same or different at each occurrence and is selected from —CN, —OR 1 , —OH, —C(O)OR 1 , —R f , aryl, X, —NO 2 , and —SO 2 R 1 , R 1 is C s H 2+1 , R f is C s F 2s+1 X is F, Cl, Br, or I, s is an integer from 1 to 6, in Formula IV: α is 0 or an integer from 1 to 5, in Formulae V through VI: β is 0 or an integer from 1 to 4, and in Formula V: δ is 0 or an integer from 1 to 3.