Metallocene compounds, and preparation and use thereof for synthesis of poly-alpha-olefins as lubricating base oil

A metallocene compound, comprising a substituted aryl group, a bridged atom, a 3-mono-substituted or 3,6-disubstituted 5H-indeno [1,2-b] pyridyl group or 3 mono-substituted or 3,6-disubstituted 5H-indeno [1,2-b] thiopyranyl group, and a metal coordination group, and the catalyst has a formula of:

• wherein:
• the aryl group is
• X is nitrogen or sulfur;
• Y is silicon or carbon as a bridging atom;
• R1 is fluorine or hydrogen on cyclopentadienyl group;
• R2 is fluorine or hydrogen on benzothiophenyl group;
• R3 is fluorine or hydrogen on indoly group;
• R4 is a substituent on a bridge, being a cyclohexyl, cyclopentyl, or cyclobutyl when bridging atom is silicon, and being 1,3,5-trisubstituted or mono-substituted or di-substituted phenyl when the bridging atom is carbon;
• R5 is halogen, or a straight-chain or branched alkyl with 2 to 24 carbon atoms on 3-mono-substituted or 3,6-disubstituted 5H-indeno [1,2-b] pyridyl or 3-mono-substituted or 3,6-disubstituted 5H-indeno [1,2-b] thiopyranyl;
• M is metal of zirconium, hafnium or titanium;
• L is a halogen as a ligand coordinated to metal.