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Synthesis, Crystal Structure of Tetra-Nuclear Macrocyclic Zn(II) Complex and Its Application as Catalyst for Oxidation of Benzyl Alcohol

1College of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, China

2Kohodo (Weifang Free Trade Zone) Hydrogen Technology Co., Ltd, Weifang 261031, China

3Shenzhen Kohodo Hydrogen Energy Co., Ltd., Shenzhen 518109, China

Received: 8 May 2021; Revised: 6 Sep 2021; Accepted: 6 Sep 2021; Published: 20 Dec 2021; Available online: 7 Sep 2021.
Open Access Copyright (c) 2021 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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A new six coordinated tetra-nuclear macrocyclic Zn(II) complex, ZnL4(Phen)2 (1) (HL= 3-bromo-2-hydroxybenzaldehyde-pyridine-2-carbohydrazone, Phen = 1,10-phenanthroline) has been synthesized by the self-assembly of 3-bromo-2-hydroxybenzaldehyde-pyridine-2-carbohydrazone, Zn(CH3COO)2•2H2O, NaOH and 1,10-phenanthroline in water/ethanol (v:v = 1:3) solution. Complex 1 was characterized by elemental analysis, infra red (IR), and single-crystal X-ray diffraction (XRD) analysis. The results show that Zn1 and Zn1b ions are six-coordinated with a distorted octahedral geometric configuration by four O atoms of two different L ligands and two N atoms of two different L ligands, Zn1a and Zn1c ions are also six-coordinated with a distorted octahedral geometric configuration by two N atoms of two different L ligands, two N atoms of Phen ligands and two O atoms of two different L ligands. Complex (1) forms 3D network structure by the - interaction. The selective oxidation reactions of benzyl alcohols catalyzed by complex (1) was investigated. The highest benzyl alcohol conversion and benzaldehyde selectivity were obtained at 100 °C for 4 h under 5 bar of O2. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (


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Keywords: Hydrazone; Tetra-nuclear macrocyclic Zn(II) complex; Synthesis; Structural characterization; Oxidation of benzyl alcohol
Funding: National Natural Science Foundation of China under contract No. 21171132; Science Foundation of Weifang ; Science Foundation of Weiyuan Scholars Innovation Team

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