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A Family of 12‐Azametallacrown‐4 Structural Motif with Heterometallic Mn III ‐Ln‐Mn III ‐Ln (Ln=Dy, Er, Yb, Tb, Y) Alternate Arrangement and Single‐Molecule Magnet Behavior
Author(s) -
Yang Hua,
Cao Fan,
Li Dacheng,
Zeng Suyuan,
Song You,
Dou Jianmin
Publication year - 2015
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.201501644
Subject(s) - isostructural , crystallography , lanthanide , antiferromagnetism , chemistry , ion , metal , molecule , magnetization , single molecule magnet , bifunctional , stereochemistry , crystal structure , physics , organic chemistry , quantum mechanics , magnetic field , condensed matter physics , biochemistry , catalysis
Abstract Mixed 3d–4f 12‐azametallacrown‐4 complexes, [Mn 2 Ln 2 (OH) 2 (hppt) 4 (OAc) 2 (DMF) 2 ] ⋅ 2 DMF ⋅ H 2 O [Ln=Dy ( 1 ), Er ( 2 ), Yb ( 3 ), Tb ( 4 ) and Y ( 5 ), H 2 hppt=3‐(2‐hydroxyphenyl)‐5‐(pyrazin‐2‐yl)‐1,2,4‐triazole)], were synthesized by reactions of H 2 hppt with Mn(OAc) 2 ⋅ 4 H 2 O and Ln(NO 3 ) 3 ⋅ 6 H 2 O. This is the first 3d–4f azametallacrown family to incorporate Ln ions into the ring sets. These isostructural complexes exhibit alternating arrangements of two Mn and two Ln ions in the rings with each pair of metal centers bound by an NN group and μ 2 ‐O bridging. Magnetic measurements revealed dominant antiferromagnetic interactions between metal centers, and frequency‐dependent out‐of‐phase ( ${\chi {^\prime}{^\prime}_{\rm{M}} }$ ) signals below 4 K suggest slow relaxation of magnetization.