Patent ID: 8703103

Claim:
A compound comprising a structure selected from the group consisting of: wherein R 1 , R 2 , R 3 and are each individually bulky groups selected from the group consisting of: C 1 -C 10 tertiary alkyl; C 1 -C 10 tertiary alkoxy; C 1 -C 10 tertiary alkylamine; C 1 -C 10 tertiary alkyl functionalized with a heteroatom substituted ring structure; C 1 -C 10 tertiary alkyl functionalized with an amide group; C 1 -C 10 tertiary alkyl functionalized with an ester group, and mixtures thereof; (L) is a neutral ligand selected from the group consisting of aliphatic C 3 -C 20 ether or polyether, crown ether, amine, poly amine, amide, poly amide, ester, polyester, aromatic ether, aromatic ester, aromatic amide, aromatic amine, pyridine, imidazole, pyridine, pyrazine, furan, pyrrole, and mixtures thereof; n=0-4; and M=Ba, Sr, Ca, Ra, Mg, or mixtures thereof.