Single molecule magnets are compounds that exhibit magnetic properties on the molecular level below a certain blocking temperature. They often possess multiple metal centers, either homometallic or heterometallic, that are clustered together through bridging ligands. An N-oxide ligand, 1-hydroxyimidazole-3-oxide (HimzO2) was used with the goal to synthesize polynuclear copper(II) complexes and to study their magnetic properties. Eight crystallographically characterized Cu(II) complexes are polymeric ranging from one- to three-dimensional coordination polymers. Magnetochemical studies of three complexes, {CuCl(m3-imzO2)(H2O)}n, {Cu2(m4-imzO2)(m-imzO2)2(H2O)2}n(NO3)n3nH2O, and {Cu2(m4-imzO2)(m-imzO2)2(H2O)2}n(ClO4)n2nH2O, show that these complexes are diamagnetic between T =1.9 and 300 K, so that the eventual exchange coupling constant between Cu(II) centers are highly negative. In order to obtain discrete polynuclear molecular complexes instead of polymers, 2-substituted derivatives (pyridyl, phenyl, pyridyl N-oxide, …) of the HimzO2 ligand were synthesized and used in complexation reactions with Cu(II) salts. Syntheses, structures and spectroscopic characterization of these complexes will be presented.

Synthesis of copper(II) complexes with 3-hydroxyimidazole-1-oxide derivatives for development of single molecule magnets

2019 Spring National Meeting

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