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Front. Chem. | doi: 10.3389/fchem.2018.00615

Diverse Coordinative Zinc Complexes Containing Amido-Pyridinate Ligands: Structural and Catalytic Studies

  • 1Providence University, Taiwan
  • 2National Chung Hsing University, Taiwan

In this work, zinc complexes containing amido-pyridinate ligands substituted with different pendant arms have been described. Treatment of ligand precursors with ZnEt2 in 1:1 ratio in THF yields zinc ethyl complexes, (PyNC1Py)2(ZnEt)2 (1) and (PyNC2NMe2)2(ZnEt)2 (2), respectively. Complexes 1 and 2 show the same geometry as a distorted tetrahedron but adopt different coordinative behaviors supported by the ligands. Complex 1 represents a rare and a non-centrosymmetric mode which the amido group bridges two zinc centres to form a six-membered ring, however complex 2 shows a centrosymmetric mode which the pyridine group links the zinc centres to form an eight-membered ring. Recrystallization of complex 2 gives an additional complex (PyNC2NMe2)4Zn3(μ3-O) (3). Attempt to prepare zinc benzyl oxide complexes affords a self-assembly cubane complex Zn7Et6(OBn)8 (4). All molecular structures 1-4 are identified by single crystal X-ray as well as spectroscopic data. Furthermore, their catalytic studies toward the ring opening polymerization of ε-caprolactone and L-lactide in the presence of benzyl alcohol are investigated.

Keywords: Amido-pyridinate ligands, Amination reaction, Zinc complexes, Ring opening polymerization (ROP), Biodegradable Polymers, Biocompatibility polymers

Received: 27 Sep 2018; Accepted: 28 Nov 2018.

Edited by:

Federico Cesano, Università degli Studi di Torino, Italy

Reviewed by:

Salah S. Massoud, University of Louisiana at Lafayette, United States
Pimpa Hormnirun, Department of Chemistry, Faculty of Science, Kasetsart University, Thailand
Jincai Wu, Lanzhou University, China  

Copyright: © 2018 Chen, Chen, Li and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Prof. Ming-Tsz Chen, Providence University, Taichung, Taiwan, mschen@pu.edu.tw
Prof. Chi-Tien Chen, National Chung Hsing University, Taichung, 402, Taiwan, ctchen@dragon.nchu.edu.tw