Pyrazine based ligands : supramolecular structures : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Chemistry at Massey University, Manawatū, New Zealand
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Date
2021
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Massey University
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Abstract
Pyrazine based ligands have been found to facilitate electronic communication between metal centres, within polynucleated structures. The control of spin states can lead to controllable bistable states of metal centres, in multinucleated supramolecular structures, possibly leading to a physical-materials, with binary analogous properties. These areas are especially of interest to many industries due to the rapidly approaching upper limit in conventional magnetic data storage. The aim of this research is the creation of new pyrazine-based ligands, which can form metal-organic supramolecular complexes, and then investigate the architectures that can be built. The design and synthesis of a new series of ligands based around a central, symmetric, pyrazine-units with functionality on the 2,5- positions was achieved including azide, alkyne and aldehyde groups. These units were than used to synthesise four novel-ligands to contribute to the ever-expanding library of ligands used in supramolecular chemistry. New pyrazine ligands were reacted with a wide range of 3d metal salts, which assembled into eleven 1D polymer chain complexes, and a 3D polymer network. NMR spectroscopy, Mass spectroscopy, ART-IT, X-ray crystallography, and other techniques was utilised to analyse the structural aspects of the ligands and complexes.