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Comparison of the Catalytic Activity of Mono‐ and Multinuclear Ga Complexes in the ROCOP of Epoxides and Cyclic Anhydrides
Author(s) -
Ghosh Swarup,
Glöckler Eduard,
Wölper Christoph,
Linders Jürgen,
Janoszka Nicole,
Gröschel André H.,
Schulz Stephan
Publication year - 2022
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202101017
Subject(s) - chemistry , steric effects , catalysis , polyester , polymer chemistry , dispersity , schiff base , polymer , stereochemistry , copolymer , organic chemistry
Abstract Tetranuclear Schiff‐base complexes L 1–3 2 Ga 4 ( t ‐Bu) 8 1 – 3 are highly active and selective (>99 %) catalyst in the alternating ring‐opening copolymerization (ROCOP) of epoxides and anhydrides, yielding polyesters with high molecular weights ( M n ) and narrow dispersity ( Đ ). The thermal properties ( T g ) of the resulting polyester range from 18 °C to 124 °C and increase with increasing steric bulk or rigidity along the polymer backbone. Comparative studies using structurally related complexes L 4 Ga( t ‐Bu) 2 4 , [L 5 GaR 2 ] 2 (R= t ‐Bu 5 , R=Me 6 ) and L 6 Ga( t ‐Bu) 2 7 proved that the Ga 2 O 2 core of catalyst 1 is the catalytically active species.