Magnetostructural Correlations in Tetrahalocuprates
Degree GrantorUniversity of Canterbury
Degree NameMaster of Science
This thesis describes the preparation and characterisation of a number of tetrahalocuprate complexes. The compounds were made by reacting the chosen organic cation with the desired copper(II) salt. Three series of tetrahalocuprates were studied; (1) 5-amino-2-substituted pyridines, (2) mixed halide tetrahalocuprates using different dimethylpyridine isomers and (3) imidazolium ions. The structure of thirty three compounds were determined using single crystal X-ray crystallography. The compounds studied gave a wide range of different structures. The 5-amino-2-substituted pyridines showed four distinct structural types; (1) two isolated protonated pyridines and a single tetrahalocuprate anion, (2) unexpected bromine substitution on the pyridine rings, (3) Cu₃Cl chains with two pyridines bound to each terminal copper and (4) water bridged copper chloride chains for the iodo substituted pyridine. The mixed halide dimethylpyridine series illustrated the effects of varying the ratio of the halides in the tetrahalocuprate anions on the crystal packing of the compounds. A number of different structures for each isomer were studied. Attempts were made using a range of different imidazolium ions to form tetrahalocuprates. These ions would not require acid protonation and are unknown in the literature in this manner.