Asymmetry-unit-dominated double slow-relaxation modes of 2, 6-dimethyl-3, 5-heptanedione dysprosium SMMs. Issue 78 (25th October 2017)

• Record Type: Journal Article
• Authors: Shi, Chao; Nie, Rong; Yao, Xu; Fan, Siqi; An, Guanghui; Dong, Yanping; Li, Guangming
• Is Part Of: RSC advances. Volume 7:Issue 78(2017)
• Page Start: 49701
• Page End: 49709
• Publication Date: 2017-10-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra09711e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Two new β-diketone mononuclear dysprosium complexes exhibit two types of single and double relaxation modes under optimized DC field. Abstract : A series of Hdmh mononuclear dysprosium complexes, namely [Dy(dmh)3 (MeOH)] (1 ), [Dy(dmh)3 (2, 2′-bpy)]2 (2 ), and [Dy(dmh)3 (phen)] (3 ), and analogue complexes of complex2 [Lu(dmh)3 (2, 2′-bpy)]2 (4 ) (Hdmh = 2, 6-dimethyl-3, 5-heptanedione, 2, 2′-bpy = 2, 2′-bipyridine, phen = 1, 10-phenanthroline), have been isolated by reaction of Hdmh and LnCl3 ·6H2 O with 2, 2′-bpy/phen auxiliary ligands. X-ray crystallographic analysis reveals that all complexes1–4 are mononuclear complexes. Complex1 is seven-coordinated by three dmh ligands and one methanol. Complexes2, 3 and4 are all eight-coordinated by three dmh ligands and one 2, 2′-bpy or phen. Magnetic studies indicate that complexes2 and3 exhibit slow relaxation at zero field but complex1 does not. Strikingly, complex2 exhibits mainly single slow relaxation under zero dc field and double slow relaxation under optimized dc field. In contrast, complex3 exhibits double slow relaxation under zero dc field and single slow relaxation under optimized dc field. The origins of the double slow relaxation modes of complex2 have been verified by dilution sample of complex4 .