Patent ID: 6930158

Claim:
An organometallic compound comprising at least one polycyclic cyclopentadienyl anion having the following formula (X): wherein: R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , Z 1 and Z 2 , independently represents hvdrogen or an organic substituent having from 1 to 15 carbon atoms, and one of said R or Z groups can be a divalent organic group further bound to another organic group having from 5 to 20 carbon atoms and comprising a cyclopentadienyl group, and n has any of the integer values from 1 to 10; M v represents any metal of the periodic table of elements having an oxidation state v greater than zero; each Z′ is independently a group of an anionic nature bound to the metal M v as an anion in an ionic couple or with a covalent bond of the “σ” type; Z″ represents an organic radical having from 5 to 30 carbon atoms, comprising a cyclopentadienyl anion π-coordinated to the metal M v ; m is 0 or 1; p=(v−m−1).