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Magnetic Relaxation in Tb III Magnetic Chains with Nitronyl Nitroxide Radical Bridges That Undergo 3D Antiferromagnetic Ordering
Author(s) -
Tian Haixia,
Wang Xiufeng,
Mei Xuelan,
Liu Ruina,
Zhu Mei,
Zhang Congming,
Ma Yue,
Li Licun,
Liao Daizheng
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201223
Subject(s) - chemistry , nitroxide mediated radical polymerization , antiferromagnetism , magnetic relaxation , paramagnetism , crystallography , magnetic susceptibility , relaxation (psychology) , ferromagnetism , stereochemistry , nuclear magnetic resonance , condensed matter physics , magnetization , magnetic field , polymer , organic chemistry , physics , monomer , psychology , social psychology , radical polymerization , quantum mechanics
Two new one‐dimensional nitronyl nitroxide radical–Ln III chain complexes, [Gd(hfac) 3 (NIT‐I)] ( 1 ) and [Tb(hfac) 3 (NIT‐I)] ( 2 ) (hfac = hexafluoroacetylacetonate; NIT‐I = 2‐iodo‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl 3‐oxide), have been synthesized. Both complexes have linear chain structures in which the NIT‐I radical ligands link the Ln(hfac) 3 units through the oxygen atoms of the nitronyl nitroxide groups. Direct‐current magnetic studies show that the Gd complex is paramagnetic above 2.0 K, whereas the Tb complex exhibits 3D antiferromagnetic ordering with T N = 4.0 K. Furthermore, complex 2 possesses frequency‐dependent ac magnetic susceptibilities, which suggests slow magnetic relaxation.