Manganese-cluster chemistry has attracted many research groups because of its impact on bioinorganic chemistry and molecular magnetism. In the latter area, many Mn clusters have been found to be single-molecule magnets (SMMs), which are molecules with a large ground-state magnetic moment and a magnetoanisotropy of the Ising-type (easy-axis). Consequently, they display the classical diagnostic property of a magnet, hysteresis loops in magnetization vs applied dc magnetic field scans. SMMs represent a molecular approach to nanoscale magnetic materials and display interesting quantum properties, such as quantum tunneling of magnetization (QTM). In recent years, we have been linking two or more SMMs together to introduce weak exchange interactions between them that yields exchange-biased QTM, quantum superposition states and entanglement: this is important for potential applications, such as for qubits in quantum computing. In the present work, we have obtained three new supramolecular clusters, a [Mn3]2 dimer and two [Mn3]8 octamers, with very interesting structures formed by using three new bis-oxime linkers, 1,3-phenylenebis(pyridin-2-ylmethanone)dioxime (1,3-ppmdH2), 1,4-phenylenebis(pyridin-2-ylmethanone)dioxime (1,4-ppmdH2), and 1,4-naphthalenebis(pyridin-2-ylmethanone)dioxime (1,4-npmdH2) respectively. The synthesis, supramolecular structures, and magnetic characterization of these supramolecular aggregates of SMMs will be described.

Supramolecular aggregates of single-molecule magnets

2019 Spring National Meeting

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