Patent ID: 8617305

Claim:
A metal-containing complex having a structure I(A): wherein R 1 is selected from the group consisting of linear or branched alkyl having from 1 to 10 carbon atoms; R 2 is selected from the group consisting of hydrogen, alkyl having from 1 to 10 carbon atoms, and aryl having 6 to 10 carbon atoms; R 3 is selected from the group consisting of linear or branched alkyl having 1 to 10 carbon atoms and aryl having 6 to 10 carbon atoms; R 4 is a linear or branched alkyl bridge having 2 to 10 carbon atoms; R 5 and R 6 are individually selected from the group consisting of C 1 -C 10 linear or branched alkyl; R 1 and R 2 are optionally connected to form a cyclic group; R 4 and R 5 are optionally connected to form a cyclic group; Râ€² is selected from the group consisting of C1-10 linear or branched alkyl or alkylsilyl having 3-10 carbon atoms; n=1 or 2; and M is selected from the group consisting of yttrium, lanthanum, gadolinium, erbium, and magnesium.