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Chemical CO Fixation by a Heterogenised Zn(ii)-hydrazone Complex

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Journal RSC Adv
Specialty Chemistry
Date 2025 Feb 27
PMID 40013065
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Abstract

A new Zn(ii) coordination compound, [Zn(HL)(OAc)] (1), with ONN-donor hydrazone ligand (HL = ()-4-amino-'-(1-(pyridin-2-yl)ethylidene)benzohydrazide) was synthesized and structurally characterized by using spectroscopic techniques and X-ray analysis. These analyses indicated that the Zn(ii) ion in the resulting coordination compound is five coordinated and the compound has a free amine functionality on the phenyl ring. Thus, [Zn(HL)(OAc)] (1) was immobilized on the surface of propionylchloride functionalized silica gel through an amidification process the reaction of the aniline part of compound 1 and the acyl chloride group of the support. The synthesized heterogeneous catalyst, Si-[Zn(HL)(OAc)], was characterized by several analytical methods and the results confirmed the successful support of 1 on the surface of the support. Si-[Zn(HL)(OAc)] was used in a chemical CO fixation reaction and styrene epoxide was used as a model substrate to investigate the catalytic performance of the supported Zn(ii) catalyst. Si-[Zn(HL)(OAc)] can efficiently catalyze the formation of cyclic carbonate from the reaction of epoxide and CO in the presence of TBAB as a co-catalyst.

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