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. Issue 41 (21st August 2015)

• Record Type: Journal Article
• Authors: Yang, Hua; Cao, Fan; Li, Dacheng; Zeng, Suyuan; Song, You; Dou, Jianmin
• Is Part Of: Chemistry. Volume 21:Issue 41(2015)
• Page Start: 14478
• Page End: 14485
• Publication Date: 2015-08-21
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201501644
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Mixed 3d–4f 12‐azametallacrown‐4 complexes, [Mn₂Ln₂(OH)₂(hppt)₄(OAc)₂(DMF)₂]<bold>⋅</bold>2 DMF<bold>⋅</bold>H₂O [Ln=Dy (<bold>1</bold>), Er (<bold>2</bold>), Yb (<bold>3</bold>), Tb (<bold>4</bold>) and Y (<bold>5</bold>), H₂hppt=3‐(2‐hydroxyphenyl)‐5‐(pyrazin‐2‐yl)‐1, 2, 4‐triazole)], were synthesized by reactions of H₂hppt with Mn(OAc)₂<bold>⋅</bold>4 H₂O and Ln(NO₃)₃<bold>⋅</bold>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 (<inline-formula><alternatives><tex-math notation="tex"><![CDATA[${\chi {^\prime}{^\prime}_{\rm{M}} }$]]></tex-math><inline-graphic xlink:href="ark:/27927/pgj2sff50tw" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></alternatives></inline-formula>) signals below 4 K suggest slow relaxation of magnetization.</p> </abstract>