Magnetic Interactions in Molecular Materials

Citation

Miller, Seth Adrian (1999) Magnetic Interactions in Molecular Materials. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/kqj7-pp77. https://resolver.caltech.edu/CaltechTHESIS:08052025-203130914

Abstract

A series of nitronylnitroxide and imino nitroxide radicals have been made that incorporate the benzene-hexafluorobenzene macromolecular synthon. These systems were designed to self-assemble into a crystal lattice in such a way that a ferromagnetic interaction is propagated. Sixteen systems, representing a potential total of thirty-two radicals, were investigated. One system was obtained with a stacking that should propagate a ferromagnetic interaction. This system, however, also contains a strong antiferromagnetic pathway, and its magnetic properties are unusual and still incompletely understood.

A molecule containing two dicyanoquinonediimine units linked meta through a benzene was synthesized. It was found to be a ground state triplet, as expected. Several metal complexes were synthesized, and the molecule was found to interact ferromagnetically with nickel. Crystals of these systems could not be obtained.

Two polymers based on the poly(arenemethide) conducting backbone were synthesized. At least one of these polymers was found to be unstable on doping. Neither system conducts.

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