Heterocyclic metallocenes and polymerization catalysts

A ligand of formula (II):

• YjR″iZjj (II)
• wherein
• (1) Y is a coordinating group containing a six π electron central radical to which is fused one or more rings containing at least one non-carbon atom selected from B, N, O, Al, P, S, Ga, Ge, As, Se, In, Sn, Sb, and Te;
• (2) R″ is a divalent bridge between the Y and Z groups;
• (3) Z is a coordinating group having the same meaning as Y or is an open pentadienyl containing group, a cyclopentadienyl containing group, a heterocyclopentadienyl containing group, a nitrogen containing group, a phosphorous containing group, an oxygen containing group, or a sulfur containing group;
• (4) i is 1;
• (5) j is an integer having a value from 1 to 3;
• and
• (6) jj is 1.

A metallocene of formula (III):

• YjR″iZjjMeQk (III)
• wherein
• (1) Y is a coordinating group containing a six π electron central radical directly coordinating Me to which radical is fused one or more rings containing at least one non-carbon atom selected from B, N, O, Al, P, S, Ga, Ge, As, Se, In, Sn, Sb, and Te;
• (2) R″ is a divalent bridge between the Y and Z groups;
• (3) Z is a coordinating group having the same meaning as Y or is an open pentadienyl containing group, a cyclopentadienyl containing group, a heterocyclopentadienyl containing group, a nitrogen containing group, a phosphorous containing group, an oxygen containing group, or a sulfur containing group;
• (4) Me is an element belonging to Group 3, 4, 5, 6, or to the lanthanide or actinide series of the Periodic Table of the Elements;
• (5) Q is a linear or branched, saturated or unsaturated alkyl radical, aryl radical, alkylaryl radical, arylalkyl radical, or a halogen atom;
• (6) i is an integer having a value of 0 or 1;
• (7) j is an integer having a value from 1 to 3;
• (8) jj is an integer having a value from 0 to 2;
• and
• (9) k is an integer having a value from 1 to 3.