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Molecules 2017, 22(11), 1860; doi:10.3390/molecules22111860

Coordination Polymers Containing 1,3-Phenylenebis-((1H-1,2,4-triazol-1-yl)methanone) Ligand: Synthesis and ε-Caprolactone Polymerization Behavior

Department of Chemistry, Universidad de los Andes, Carrera 1 N° 18A-12, Bogotá 111711, Colombia
Grupo de Química Inorgánica y Materiales Moleculares, Universidad Autonoma de Chile, El Llano Subercaseaux 2801, Santiago 8910060, Chile
Relativistic Molecular Physics (ReMoPh) Group, Universidad Andres Bello, Republica 275, Santiago, Chile
Author to whom correspondence should be addressed.
Received: 18 September 2017 / Revised: 23 October 2017 / Accepted: 26 October 2017 / Published: 10 November 2017
(This article belongs to the Section Organometallic Chemistry)
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The reaction of isophthaloyl dichloride with 1H-1,2,4-triazole afforded the new ligand 1,3-phenylenebis(1,2,4-triazole-1-yl)methanone (1). A series of Co(II), Cu(II), Zn(II) and Ni(II) complexes were synthesized using 1 and then characterized by melting point analysis, elemental analysis, theoretical calculations, thermogravimetric analysis, X-ray powder diffraction, nuclear magnetic resonance, infrared and Raman spectroscopy. Experimental and computational studies predict the formation of coordination polymers (CPs). The cobalt and copper CPs and zinc(II) complex were found to be good initiators for the ring-opening polymerization of ε-caprolactone (CL) under solvent-free conditions. 1H-NMR analysis showed that the obtained polymers of CL were mainly linear and had terminal hydroxymethylene groups. Differential scanning calorimetry showed that the obtained polycaprolactones had high crystallinity, and TGA showed that they had decomposition temperatures above 400 °C. These results provide insight and guidance for the design of metal complexes with potential applications in the polymerization of CL. View Full-Text
Keywords: triazole ligand; coordination polymers; initiators; ε-caprolactone polymerization triazole ligand; coordination polymers; initiators; ε-caprolactone polymerization

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bello-Vieda, N.J.; Murcia, R.A.; Muñoz-Castro, A.; Macías, M.A.; Hurtado, J.J. Coordination Polymers Containing 1,3-Phenylenebis-((1H-1,2,4-triazol-1-yl)methanone) Ligand: Synthesis and ε-Caprolactone Polymerization Behavior. Molecules 2017, 22, 1860.

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