Patent ID: 7238819

Claim:
A compound of the general structure (I) [HC(CRR′R″)(CRR′R″)] +[M 2 X g] − (I), wherein R is independently hydrogen or a group of the formula M′R 1 R 2 R 3 , R′ is a group of the formula M′R 4 R 5 R 6 , R″ is hydrogen, a C 1 to C 12 alkyl, a C 6 to C 14 aryl or a C 7 to C 20 alkylaryl, M is Zr or Hf, M′ is Si, Ge, Sn or Pb, X is a halogen atom, and R 1 to R 6 is a C 1 to C 12 alkyl group, a C 6 to C 14 aryl or a C 7 to C 20 alkylaryl.