Patent ID: 7638074

Claim:
A precursor composition comprising: a precursor of the formula M(Cp) 2 wherein M is Ba or Sr, and Cp is cyclopentadienyl of the formula: wherein each of R 1 -R 5 is the same as or different from one another, with each being independently selected from among hydrogen, C 1 -C 12 alkyl, C 1 -C 12 amino, C 6 -C 10 aryl, C 1 -C 12 alkoxy, C 3 -C 6 alkylsilyl, C 2 -C 12 alkenyl, R 1 R 2 R 3 NNR 3 , wherein R 1 , R 2 and R 3 may be the same as or different from one another and each is independently selected from hydrogen and C 1 -C 6 alkyl, and pendant ligands including functional group(s) providing further coordination to the metal center M; and a solvent medium comprising a solvent species selected from the group consisting of C 3 -C 12 alkanes, C 2 -C 12 ethers, C 6 -C 12 aromatics, C 8 -C 16 arylalkanes, C 10 -C 25 arylcyloalkanes, and further alkyl-substituted forms of such aromatic, arylalkane and arylcyloalkane species, wherein the further alkyl substituents in the case of multiple alkyl substituents may be the same as or different from one another and wherein each is independently selected from C 1 -C 8 alkyl.