Tanimoto Ryu, Wada Tomoyuki, Okada Keiji, Shiomi Daisuke, Sato Kazunobu, Takui Takeji, Suzuki Shuichi, Naota Takeshi, Kozaki Masatoshi
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Osaka 558-8585, Japan.
Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Osaka 560-8531, Japan.
Inorg Chem. 2022 Feb 21;61(7):3018-3023. doi: 10.1021/acs.inorgchem.1c03764. Epub 2022 Feb 7.
A gadolinium(III) complex coordinated with six nitronyl nitroxide radicals showed intriguing temperature-dependent changes in magnetic susceptibilities. The gadolinium(III) ion in the complex is pseudo-eight-coordinated by three singlet-ground-state diradical anion species based on nitronyl nitroxide radicals. The magnetic susceptibility (χ) of the gadolinium(III) complex at 298 K, whose value corresponded to that of a system with 13 unpaired electrons (seven-spin system), decreased upon a lowering of the temperature to 11 K but increased upon a further lowering of the temperature. Finally, the χ value at 2 K was found to be higher than that at room temperature. The temperature-dependent magnetic behavior could be explained by a structural change in the diradical anion ligand due to its flexibility.
