Abstract
Magnetic properties of organic radicals based on thienyl- and furyl-substituted nitronyl nitroxide (NN) and iminonitroxide (IN) were investigated by measuring the temperature dependence of the magnetization. The magnetic behavior of 2-benzo[b]thienyl NN (2-BTHNN) is interpreted in terms of the two-magnetic-dimer model, in which one dimer exhibits ferromagnetic (FM) intermolecular interaction and the other dimer shows antiferromagnetic (AFM) interaction. The existence of two dimers in 2-BTHNN is supported by crystal structure analysis. The magnetic behaviors of 2-bithienyl NN, 4-(2′-thienyl)phenyl NN (2-THPNN), 2- and 3-furyl NN, 2-benzo[b]furyl NN, and 3-benzo[b]thienyl IN are also reported. The one-dimensional alternating AFM nature observed in 2-THPNN is consistent with its crystal structure.
Highlights
Magnetism in neutral organic radicals based on nitronyl nitroxide (NN)
We report here crystal structures of 2-benzo[b]thienyl NN (2-BTHNN) and 2-THPNN to discuss magnetostructural correlations in these radicals
B mentioned woulddifferent yield very distinctive magnetic behaviors, i.e., dimers and Binteractions mentioned in above would yield veryitdistinctive behaviors, i.e., FM and is not easymagnetic to attribute the origin of it is not easy to attribute the origin of FM and AFM interactions onto these different dimers, the nearly orthogonally arranged interactions onto these different the nearly orthogonally molecules in the dimer A seems to give the FMdimers, interactions, and the face-to-facearranged stacking molecules in the dimer seems to give the interactions, and the face-to-face of benzothienyl groups appears to result in the AFM interactions in 2-BTHNN. stacking of benzothienyl groups appears to result in the AFM interactions in 2-BTHNN
Summary
Magnetism in neutral organic radicals based on nitronyl nitroxide (NN) 4,4,5,5-tetramethyl-4,5-dihydro-3-oxido-1H-imidazol-3-ium-2-yl-1-oxyl) and iminonitroxide (IN) (2-substituted 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-2-yl-1-oxyl) has long been studied to find new magnetically interesting molecular crystals, since these radicals are usually stable in the solid state [1] and have been components of many molecule-based magnets [2,3,4,5,6,7,8,9,10]. We report here magnetic properties of three thienyl-substituted NN derivatives, 2-benzo[b]thienyl NN (2-BTHNN), 2-bithienyl NN (2-BiTHNN), and 4-(20 -thenyl)phenyl NN (2-THPNN) and two thienyl-substituted IN derivatives, 2- and 3-benzo[b]thienyl IN (2-BTHIN and 3-BTHIN). We report here crystal structures of 2-BTHNN and 2-THPNN to discuss magnetostructural correlations in these radicals.
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