Synthesis,Crystal Structure,and Magnetic Property of New Trispin Ln(III)‐Nitronyl Nitroxide Complexes |
| |
| Authors: | Zhe Fan Yi‐Fang Hou Shu‐Ping Wang Shu‐Tao Yang Jian‐Jun Zhang Shi‐Kao Shi Li‐Na Geng |
| |
| Affiliation: | 1. College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang, P. R. China;2. +86 31180787400;3. Experimental Center, Hebei Normal University, Shijiazhuang, P. R. China |
| |
| Abstract: | Four Ln(III) complexes based on a new nitronyl nitroxide radical have been synthesized and structurally characterized: {Ln(hfac)3[NITPh(MeO)2]2} (Ln = Eu( 1 ), Gd( 2 ), Tb( 3 ), Dy( 4 ); NITPh(MeO)2 = 2‐(3′,4′‐dimethoxyphenyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide; hfac = hexafluoroacetylacetonate). The single‐crystal X‐ray diffraction analysis shows that these complexes have similar mononuclear trispin structures, in which central Ln(III) ion is eight‐coordinated by two O‐atoms from two nitroxide groups and six O‐atoms from three hfac anions. The variable temperature magnetic susceptibility study reveals that there exist ferromagnetic interactions between Gd(III) and the radicals, and antiferromagnetic interactions between two radicals (JGd‐Rad = 3.40 cm?1, JRad‐Rad = ?9.99 cm?1) in complex 2 . Meanwhile, antiferromagnetic interactions are estimated between Eu(III) (or Dy(III)) and radicals in complexes 1 and 4 , and ferromagnetic interaction between Tb(III) and radicals in complex 3 , respectively. |
| |
| Keywords: | Nitronyl nitroxide Rare earth metal complexes Structure elucidation Magnetic properties |
|
|
