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Ring-opening polymerization of lactides and ε-caprolactone catalyzed by Zn(II) aryl carboxylate complexes supported by 4-pyridinyl schiff base ligands.

ABSTRACT: Synthesis and catalytic studies of aryl carboxylate Zn (II) complexes is reported. Reaction of substituted (E)-N-phenyl-1-(pyridin-4-yl)methanimine with a methanolic solution of Zn(CH3COO)2 and substituted aryl carboxylate co-ligands gave heteroleptic Zn(II) complexes; [Zn(C6H5COO)2(L1)]2 (1), [Zn(C7H7COO)2(L1)]2 (2), [Zn (4-F-C6H4COO)2(L1)]2 (3), [Zn(C6H5COO)2(L2)]2 (4), [Zn(C7H7COO)2(L2)]2 (5), [Zn (4-F-C6H4COO)2(L2)]2 (6), [Zn(C6H5COO)2(L3)]2 (7), [Zn(C7H7COO)2(L3)]2 (8), [Zn (4-F-C6H4COO)2(L3)]2 (9). The molecular structures of complexes 1 and 4 are dinuclear with the zinc atom in complex 1 adopting a distorted trigonal bipyramidal geometry in a bi-metallacycle while complex 4 is square pyramidal where all four benzoate ligands bridge the zinc metals in a paddle wheel arrangement. All complexes successfully initiated mass/bulk ring-opening polymerization (ROP) of ϵ-caprolactone (ϵ-CL) and lactides (LAs) monomers with or without alcohol co-initiators at elevated temperatures. Complexes 1, 4 and 6 containing the unsubstituted benzoate co-ligands were the most active in their triad; with complex 4 being the most active (k app) of 0.3450 h-1. The physicochemical properties of the polymerization products of l-lactide and rac-lactide in toluene revealed melting temperatures (Tm) between 116.58 °C and 188.03 °C, and decomposition temperatures between 278.78 °C and 331.32 °C suggestive of an isotactic PLA with a metal capped end.

SUBMITTER: Akintayo DC 

PROVIDER: S-EPMC9950825 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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Ring-opening polymerization of lactides and ε-caprolactone catalyzed by Zn(II) aryl carboxylate complexes supported by 4-pyridinyl schiff base ligands.

Akintayo Damilola C DC   Munzeiwa Wisdom A WA   Jonnalagadda Sreekantha B SB   Omondi Bernard B  

Heliyon 20230206 2

Synthesis and catalytic studies of aryl carboxylate Zn (II) complexes is reported. Reaction of substituted (<i>E</i>)-<i>N</i>-phenyl-1-(pyridin-4-yl)methanimine with a methanolic solution of Zn(CH<sub>3</sub>COO)<sub>2</sub> and substituted aryl carboxylate co-ligands gave heteroleptic Zn(II) complexes; [Zn(C<sub>6</sub>H<sub>5</sub>COO)<sub>2</sub>(<b>L1</b>)]<sub>2</sub> (<b>1</b>), [Zn(C<sub>7</sub>H<sub>7</sub>COO)<sub>2</sub>(<b>L1</b>)]<sub>2</sub> (<b>2</b>), [Zn (4-F-C<sub>6</sub>H<sub>  ...[more]

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