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Synthesis, Crystal Structure, and Magnetic Property of New Trispin Ln( III )‐Nitronyl Nitroxide Complexes
Author(s) -
Fan Zhe,
Hou YiFang,
Wang ShuPing,
Yang ShuTao,
Zhang JianJun,
Shi ShiKao,
Geng LiNa
Publication year - 2016
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.201600152
Subject(s) - chemistry , nitroxide mediated radical polymerization , antiferromagnetism , radical , crystallography , ferromagnetism , magnetic susceptibility , crystal structure , intramolecular force , single crystal , stereochemistry , condensed matter physics , organic chemistry , polymerization , polymer , physics , radical polymerization
Four Ln( III ) complexes based on a new nitronyl nitroxide radical have been synthesized and structurally characterized: {Ln(hfac) 3 [ NITP h(MeO) 2 ] 2 } (Ln = Eu( 1 ), Gd( 2 ), Tb( 3 ), Dy( 4 ); NITP h(MeO) 2 = 2‐(3′,4′‐dimethoxyphenyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide; hfac = hexafluoroacetylacetonate). The single‐crystal X‐ray diffraction analysis shows that these complexes have similar mononuclear trispin structures, in which central Ln( III ) ion is eight‐coordinated by two O‐atoms from two nitroxide groups and six O‐atoms from three hfac anions. The variable temperature magnetic susceptibility study reveals that there exist ferromagnetic interactions between Gd( III ) and the radicals, and antiferromagnetic interactions between two radicals ( J G d‐Rad = 3.40 cm −1 , J R ad‐Rad = −9.99 cm −1 ) in complex 2 . Meanwhile, antiferromagnetic interactions are estimated between Eu( III ) (or Dy( III )) and radicals in complexes 1 and 4 , and ferromagnetic interaction between Tb( III ) and radicals in complex 3 , respectively.