Patent ID: 6958408

Claim:
A compound of formulae (I) or (II): [A][Si(R) 3−n RF n ] z (I) in which: A represents a cyclopentadienyl, indenyl or fluorenyl radical; R represents a hydrogen atom, a linear or branched alkyl radical having a number of carbon atoms ranging from 1 to 40, an alkoxy radical having a number of carbon atoms ranging from 1 to 10, an aryl radical having from 6 to 20 carbon atoms, an aryloxy radical having from 6 to 10 carbon atoms or an alkenyl radical having a number of carbon atoms ranging from 2 to 10; Rf represents a perfluoroalkyl radical C x F 2x+1 —(CH 2 ) y — in which x represents an integer ranging from 1 to 20 an y=0, 1, 2 or 3; n=1, 2 or 3; z=1, 2 or 3; B represents a divalent group >MR 1 R 2 or else in which M represents a carbon atom, a silicon atom, a germanium atom or a tin atom; R 1 , R 2 , R 3 and R 4 , which are identical or different, represent a hydrogen atom, a linear or branched alkyl radical having a number of carbon atoms ranging from 1 to 20 or an aryl radical having from 6 to 14 carbon atoms; C represents a cyclopentadienyl, methylcyclopentadienyl, pentamethylcyclopentadienyl, butylcyclopentadienyl, indenyl, naphthyl or fluorenyl radical; w=1 or 2.