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Hetero‐tri‐spin [2p‐3d‐4f] Chain Compounds Based on Nitronyl Nitroxide Lanthanide Metallo‐Ligands: Synthesis, Structure, and Magnetic Properties
Author(s) -
Zhu Mei,
Hu Peng,
Li Yungai,
Wang Xiufeng,
Li Licun,
Liao Daizheng,
Durga Prasad Goli V. M. L.,
Ramasesha S.,
Sutter JeanPascal
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403581
Subject(s) - lanthanide , nitroxide mediated radical polymerization , crystallography , chemistry , oxide , radical , ferromagnetism , magnetic susceptibility , metal , spin (aerodynamics) , stereochemistry , polymer , ion , organic chemistry , condensed matter physics , polymerization , physics , radical polymerization , thermodynamics
Employing nitronyl nitroxide lanthanide(III) complexes as metallo‐ligands allowed the efficient and highly selective preparation of three series of unprecedented hetero‐tri‐spin (CuLn‐radical) one‐dimensional compounds. These 2p–3d–4f spin systems, namely [Ln 3 Cu(hfac) 11 (NitPhOAll) 4 ] (Ln III =Gd 1 Gd , Tb 1 Tb , Dy 1 Dy ; NitPhOAll=2‐(4′‐allyloxyphenyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide), [Ln 3 Cu(hfac) 11 (NitPhOPr) 4 ] (Ln III =Gd 2 Gd , Tb 2 Tb , Dy 2 Dy , Ho 2 Ho , Yb 2 Yb ; NitPhOPr=2‐(4′‐propoxyphenyl)‐4,4,5,5‐tetramethyl‐imidazoline‐1‐oxyl‐3‐oxide) and [Ln 3 Cu(hfac) 11 (NitPhOBz) 4 ] (Ln III =Gd 3 Gd , Tb 3 Tb , Dy 3 Dy ; NitPhOBz=2‐(4′‐benzyloxyphenyl)‐4,4,5,5‐tetramethyl‐imidazoline‐1‐oxyl‐3‐oxide) involve O‐bound nitronyl nitroxide radicals as bridging ligands in chain structures with a [Cu‐Nit‐Ln‐Nit‐Ln‐Nit‐Ln‐Nit] repeating unit. The dc magnetic studies show that ferromagnetic metal–radical interactions take place in these hetero‐tri‐spin chain complexes, these and the next‐neighbor interactions have been quantified for the Gd derivatives. Complexes 1 Tb and 2 Tb exhibit frequency dependence of ac magnetic susceptibilities, indicating single‐chain magnet behavior.