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RESEARCH ARTICLE
Contents Vol 68(5)

ZnII Complexes Based on Hybrid N-Pyrazole, N′-imine Ligands: Synthesis, X-Ray Crystal Structure, NMR Characterisation, and 3D Supramolecular Properties

Miguel Guerrero A , Lourdes Rivas A , Teresa Calvet B , Mercè Font-Bardia B C and Josefina Pons A D
+ Author Affiliations
- Author Affiliations

A Departament de Química, Universitat Autònoma de Barcelona, 08193-Bellaterra, Barcelona, Spain.

B Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028-Barcelona, Spain.

C Unitat de Difracció de Raig-X, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB), Universitat de Barcelona, Solé i Sabaris, 1-3, 08028-Barcelona, Spain.

D Corresponding author. Email: Josefina.Pons@uab.es

Australian Journal of Chemistry 68(5) 749-757 https://doi.org/10.1071/CH14344
Submitted: 29 May 2014  Accepted: 29 July 2014   Published: 14 October 2014

Abstract

The present report is on the synthesis of two new 3-imine-3,5-dimethylpyrazole ligands, N-[3-(3,5-dimethyl-1H-pyrazol-1-yl)propylidene]ethylamine (L1) and N-[3-(3,5-dimethyl-1H-pyrazol-1-yl)propylidene]propylamine (L2). These ligands form molecular complexes with the formula [ZnCl2(L)] (L = L1 (1) and L2 (2)) when the reacting with ZnCl2 in a metal (M)/ligand (L) ratio of 1 : 1. These new ZnII complexes have been characterised by elemental analyses, conductivity measurements, mass spectrometry, and infrared, 1H and 13C{1H} NMR spectroscopy techniques. The two crystalline structures of complexes 1 and 2 have been solved by X-ray diffraction methods. Finally, we have studied the self-assembly three-dimensional supramolecular structure through different intra- and intermolecular contacts. The application of these ZnII complexes in supramolecular crystal engineering is interesting due to (1) the easy preparation and the high efficiency of this system and (2) the different bonding properties of the heteroatoms (N-pyrazole vs N-imine) present in the structure of the ligands.


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