A Family of 12‐Azametallacrown‐4 Structural Motif with Heterometallic MnIII‐Ln‐MnIII‐Ln (Ln=Dy,Er, Yb,Tb, Y) Alternate Arrangement and Single‐Molecule Magnet Behavior |
| |
| Authors: | Dr Hua Yang Dr Fan Cao Prof Dacheng Li Dr Suyuan Zeng Prof You Song Prof Jianmin Dou |
| |
| Institution: | 1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059 (P.R. China);2. State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, 210093 Nanjing (P.R. China) |
| |
| Abstract: | Mixed 3d–4f 12‐azametallacrown‐4 complexes, Mn2Ln2(OH)2(hppt)4(OAc)2(DMF)2] ? 2 DMF ? H2O Ln=Dy ( 1 ), Er ( 2 ), Yb ( 3 ), Tb ( 4 ) and Y ( 5 ), H2hppt=3‐(2‐hydroxyphenyl)‐5‐(pyrazin‐2‐yl)‐1,2,4‐triazole)], were synthesized by reactions of H2hppt with Mn(OAc)2 ? 4 H2O and Ln(NO3)3 ? 6 H2O. 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 N?N group and μ2‐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. |
| |
| Keywords: | crown compounds heterometallic complexes magnetic properties N O ligands rare earths |
|
|
