Ligand-Assisted Formation of Heterobimetallic Adducts of AlMe₃ and ZnMe₂ with Zr and Hf Salan Catalysts for Olefin Polymerization.

ABSTRACT: Cationic Salan Zr- and Hf-benzyl precatalysts for olefin polymerization were reacted with AlMe₃ and ZnMe₂ to probe their tendency to form stable heterobimetallic adducts and understand the role played by the ligand-based Lewis-basic functionalities in modulating the nature of such adducts. NMR studies in solution and DFT computations show that unlike typical metallocenes, Salan complexes bind AlMe₃ and ZnMe₂ to form only a single μ-Me interaction between the transition and the main-group metal. The latter is engaged in a further interaction with one oxygen atom of the ligand, leading to an unsymmetrical adduct. The formed heterobimetallic complexes are fluxional in solution, and their chemical exchange patterns were characterized by ¹H

SUBMITTER: Morello M 

PROVIDER: S-EPMC12709582 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature