Structural and Magnetic Properties of 2p‐3d‐4f Hetero‐Tri‐Spin Chains Comprising [{Cu(hfac)2‐Radical}2] Dimers and Ln(hfac)3 (hfac=hexafluoroacetylacetonate). Issue 13 (31st May 2016)

• Record Type: Journal Article
• Authors: Zhu, Mei; Yang, Meng; Wang, Juanjuan; Li, Hongdao; Li, Licun
• Is Part Of: Chemistry, an Asian journal. Volume 11:Issue 13(2016)
• Page Start: 1900
• Page End: 1905
• Publication Date: 2016-05-31
• Subjects: chain structures -- dimerization -- magnetic properties -- radicals -- structure elucidation; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201600383
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: A new family of 2p‐3d‐4f hetero‐tri‐spin complexes [Ln(hfac)3 {Cu(hfac)2 (NIT‐3 PyPh)}2 ] (Ln=Gd (1 ), Tb (2 ), Dy (3 ), Ho (4 ); NIT‐3 PyPh=2‐[4‐(3‐pyridinylmethoxy)phenyl]‐4, 4, 5, 5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide; hfac=hexafluoroacetylacetonate) have been synthesized. Four complexes possess a 1D chain structure in which two radical ligands join two Cu(hfac)2 molecules to form a [{Cu(hfac)2 ‐rad)}2 ] dimer cycle and the dimer rings are linked by Ln(hfac)3 units. Magnetic studies show that ferromagnetic exchange couplings exist between the coordinated NO groups of radical ligands and metal ions. Field‐induced slow relaxation of the magnetization was observed in the Tb and Dy compounds. Abstract : Chain gang : A series of 2p‐3d‐4f chains that feature [{Cu(hfac)2 ‐radical}2 ] dimer rings bridged by Ln(hfac)3 units have been obtained (see figure). The Tb and Dy compounds show field‐induced slow magnetic relaxation behaviors.