A complex of formula (I): wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR′2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom, C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; each R1 is a C4-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring, optionally containing one or more heteroatoms belonging to groups 14-16, or is a C3-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring where the β-atom is an Si-atom; n is 0-3; each R18 is the same or different and may be a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; each R4 is a hydrogen atom or a C1-6-hydrocarbyl radical; each W is a 5 or 6 membered aryl or heteroaryl ring wherein each atom of said ring is optionally substituted with an R5 group each R5 is the same or different and is a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; and optionally two adjacent R5 groups taken together can form a further mono or multicyclic ring condensed to W optionally substituted by one or two groups R5.
一种公式(I)的复合物:其中M为
锆或
铪;每个X为σ
配体;L为二价桥,选择自—R′2C—,—R′2C—CR′2—,—R′2Si—,—R′2Si—SiR′2—,—R′2Ge—,其中每个R′独立地为
氢原子,C1-C20-烃基,三(C1-C20-烷基)
硅基,C6-C20-芳基,C7-C20-芳基烷基或C7-C20-烷基芳基;每个R1为分支在
环戊二烯基环的β原子处的C4-C20烃基基团,可选地含有属于14-16族的一个或多个杂原子,或为分支在
环戊二烯基环的β原子处的C3-C20烃基基团,其中β原子为Si原子;n为0-3;每个R18相同或不同,可以是C1-C20烃基基团,可选地含有一个或多个属于14-16族的杂原子;每个R4为
氢原子或C1-6烃基基团;每个W为5或6成员的芳基或杂芳基环,其中该环的每个原子可选地用R5基团取代,每个R5相同或不同,是C1-C20烃基基团,可选地含有一个或多个属于14-16族的杂原子;并且可选地,相邻的两个R5基团可以共同形成进一步的单环或多环环,与W螺合,可选地用一个或两个基团R5取代。