Lanthanoid (III) diphthalocyanine (LnPc2) complexes have attracted significant interest in the past due to their interesting magnetic properties. The large anisotropy of the lanthanoid centers makes these complexes good candidates for single-molecule magnets, which in turn are part of the reason why these complexes are potential quantum bits, or qubits. However, it is not only the lanthanoid centers that make these complexes so interesting. The aromatic phthalocyanine ligands enhance access to the magnetically competent f-orbitals on the lanthanoid centers. Additionally, these ligands can be modified to assess the impact of electronic and steric factors on the magnetic properties Presented here is a comparison between the synthesis and characterization of unsubstituted LnPc2 and halogenated LnPc2 complexes, the latter of which have been unexplored thus far. A one-pot have reaction followed by size-exclusion chromatography has proven to be a reliable method that leads to a variety of crystalline polymorphs, which have been studied with X-ray crystallography. Presented here is also a comparison of single-crystal conductivity and magnetic measurements on these various polymorphs. By studying various LnPc2 complexes, a better understanding can be obtained on how various factors, such as oxidation state and crystal structure, impact magnetic relaxation. Understanding what impacts magnetic relaxation is an important and necessary step in building better qubits.

Halogenated and unsubstituted lanthanoid (III) diphthalocyanines as potential qubits

2019 Spring National Meeting

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