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Construction and Magnetic Study of One‐Dimensional Lanthanide–Radical Chains Involving Pyridinone‐Substituted Nitronyl Nitroxide Radicals
Author(s) -
Guo Jianni,
Sun Juan,
Sun Guifang,
Sun Zan,
Li Licun
Publication year - 2018
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.201800513
Subject(s) - chemistry , nitroxide mediated radical polymerization , lanthanide , radical , antiferromagnetism , crystallography , inductive coupling , ferromagnetism , ion , magnetic susceptibility , intramolecular force , stereochemistry , radical polymerization , polymerization , polymer , organic chemistry , condensed matter physics , physics , engineering , electrical engineering
A new nitronyl nitroxide radical‐containing pyridinone group (NIT‐PhPyO, 1 ) has been synthesized {NIT‐PhPyO = 2‐[4‐(4‐pyridinone)phenyl]‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide}. By using this functionlized nitronyl nitroxide, two isomorphic lanthanide–nitronyl nitroxide radical compounds [{Ln(hfac) 3 } 3 (NIT‐PhPyO) 2 ] n (Ln = Gd 2 and Dy 3 ; hfac = hexafluoroacetylacetonate) have been successfully obtained. X‐ray spectroscopic analysis reveals that complexes 2 and 3 possess a 1D chain structure with Ln 2 O 2 binuclear units, which represent the first examples of Ln–radical chains involving binuclear Ln 2 O 2 units. Analysis of the magnetic data indicates that a weak antiferromagnetic coupling exists between two Gd 3+ ions, while the magnetic interaction between the Gd III ion and the coordinated nitroxide group is ferromagnetic. Alternating current (ac) magnetic studies indicate that compound 3 displays slow magnetic relaxation behavior at low temperature.