Complexation reactions of some poly-n-topic ligands – towards large [n×n] square grids (n = 2-4).

Elliott, Andrew (2017) Complexation reactions of some poly-n-topic ligands – towards large [n×n] square grids (n = 2-4). Masters thesis, Memorial University of Newfoundland.

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Abstract

The coordination chemistry of a series of poly-n-topic pyrimidine, pyridazine, benzothiazole and triazole based ligands was studied. The ligands were designed with donor pocket arrangements which have the potential to form self-assembled multimetallic [n×n] grids. Such assemblies can exhibit interesting magnetic and redox properties, and have potential application in data storage at the molecular level. Ligand synthetic strategies and synthetic methods will be discussed and typical grid complexes described. Reactions with Mn(II), Ni(II), Co(II), and Cu(II) were attempted and the products characterized by X-ray and variable temperature magnetism. Antiferromagnetism typically dominates the magnetic behaviour in such systems, but in the cases of some [2×2] Cu(II)₄ square grids ferromagnetic behaviour was observed, which was attributed to the strict magnetic orbital orthogonality, resulting from the orientation of the Jahn-Teller axes in the grid.

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