Magnetic properties of transition metal complexes with 2,2′-bipyridin-5-yl t-butyl nitroxide |
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| Institution: | 1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;3. Department of Chemistry, East China University of Science and Technology, Shanghai 200237, PR China |
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| Abstract: | Complexes MnII(5bpno)3(ClO4)2], MnII(5bpno)(CH3OH)2Cl2], CuII(5bpno)2(ClO4)2], and CuII(5bpno)Cl2] were prepared, where 5bpno stands for 2,2′-bipyridin-5-yl t-butyl nitroxide. X-ray crystallographic analysis clarified that the Cu ion in Cu(5bpno)2(ClO4)2] was tetra-coordinate with four nitrogen atoms forming two chelate rings. Magnetic measurements revealed the presence of ferromagnetic couplings in the Mn complexes, whereas the Cu complexes showed antiferromagnetic couplings. Magnetic exchange couplings between the metal and radical spins through the intervening pyridine ring can be explained in terms of the spin-polarization mechanism. |
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