Patent ID: 6872843

Claim:
A compound of the formula (I): wherein M 1 is a metal of transition group III, IV, V or VI of the Periodic Table of the Elements, R 1 are identical or different and are each a hydrogen atom or Si(R 12 ) 3 , wherein R 12 are identical or different and are each a hydrogen atom or a C 1 -C 40 group, or R 1 are identical or different and are each a C 1 -C 30 group which is optionally fluorinated, or two or more radicals R 1 are joined to one another so that the radicals R 1 and the atoms of the cyclopentadienyl ring which connect them form a C 4 -C 24 ring system which is optionally substituted, R 2 are identical or different and are each a hydrogen atom or Si(R 12 ) 3 , wherein R 12 is as defined above, or R 2 are identical or different and are each a C 1 -C 30 group which is optionally fluorinated C 5 -C 24 -heteroaryl which together with the cyclopentadienyl ring form azapentalenes, thiapentalenes or phosphapentalenes, or two or more radicals R 2 are joined to one another so that the radicals R 2 and the atoms of the cyclopentadienyl ring which connect them form a C 4 -C 24 ring system which is optionally substituted, R 5 and R 6 are identical or different and are each a hydrogen atom or Si(R 12 ) 3 , wherein R 12 is as defined above, or R 5 and R 6 are identical or different and are each a C 1 -C 30 group which is optionally fluorinated, or the radicals R 5 and R 6 are joined to one another so that the radicals R 5 and R 6 form a C 4 -C 24 ring system which is optionally substituted, R 60 is a hydrogen atom or a C 1 -C 12 -alkyl group, l is 5 when v=0 and l is 4 when v−1, m is 5 when v=0 and m is 4 when v=1, D, Q and Y independently are each an element of main group III, IV, V or VI of the Periodic Tablc of the Elements, X are identical or different and are each an element of main group III, IV, V or VI of the Periodic Table of the Elements and optionally form cyclic systems, L are identical or different and are each a hydrogen atom, a C 1 -C 10 -hydrocarbon group, a halogen atom or OR 9 , SR 9 , OSiR 3 9 , SiR 3 9 , PR 2 9 or NR 2 9 , wherein R 9 is a halogen atom, a C 1 -C 10 -alkyl group, a halogenated C 1 -C 10 -alkyl group, a C 6 -C 20 -aryl group or a halogenated C 6 -C 20 -aryl group, or L is a toluenesulfonyl, trifluoroacetyl, trifluoroacetoxyl, trifluoromethanesulfonyl, nonafluorobutanesulfonyl or 2,2,2-trifluoroethanesulfonyl group, n is an integer from 1 to 4, Z is a bridging structural element and v is 0 or 1.