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Magnetic Slow Relaxation in Cyclic Tb III ‐Nitronyl Nitroxide Radical Complexes
Author(s) -
Tian Haixia,
Liu Ruina,
Wang Xiaoling,
Yang Peipei,
Li Zuoxi,
Li Licun,
Liao Daizheng
Publication year - 2009
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.200900584
Subject(s) - chemistry , nitroxide mediated radical polymerization , dimer , pyridine , ion , crystallography , oxide , magnetic relaxation , metal , relaxation (psychology) , stereochemistry , photochemistry , medicinal chemistry , polymerization , organic chemistry , magnetization , polymer , radical polymerization , psychology , social psychology , physics , quantum mechanics , magnetic field
Two nitronyl nitroxide radical‐Tb III complexes, [Tb(hfac) 3 (NIT‐3Py)] 2 ( 1 ) and [Tb(hfac) 3 (NIT‐4Py)] 2 ( 2 ) {hfac = hexafluoroacetylacetonate; NIT‐3Py = 2‐(3′‐pyridyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl 3‐oxide; NIT‐4Py = 2‐(4′‐pyridyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl 3‐oxide} have been synthesized. Both complexes possess cyclic dimer structure in which each pyridyl‐substituted radical links two different metal ions through the oxygen of nitroxide group and the pyridine nitrogen. DC magnetic studies show the Tb III ion interacts ferromagnetically with the directly bonding nitronyl nitroxide. Complex 1 exhibits magnetic slow relaxation resembling SMM behavior, while there are no clearly the frequency‐dependent out‐of‐phase signals for complex 2 .(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)