Dysprosium(III) complexes with a square-antiprism configuration featuring mononuclear single-molecule magnetic behaviours based on different beta-diketonate ligands and auxiliary ligands

doi:10.1039/c6dt00219f

	Dysprosium(III) complexes with a square-antiprism configuration featuring mononuclear single-molecule magnetic behaviours based on different beta-diketonate ligands and auxiliary ligands
	Zhang, Sheng 2,4; Ke, Hongshan 2; Shi, Quan 3; Zhang, Jangwei 1; Yang, Qi 2; Wei, Qing 2; Xie, Gang 2; Wang, Wenyuan 2; Yang, Desuo 4; Chen, Sanping 2
刊名	DALTON TRANSACTIONS
	2016
卷号	45 期号:12 页码:5310-5320
ISSN号	1477-9226
DOI	10.1039/c6dt00219f
文献子类	Article
英文摘要	Three mononuclear dysprosium(III) complexes derived from three beta-diketonate ligands, 4,4,4-trifluoro-1-(4-methylphenyl)-1,3-butanedione (tfmb), 4,4,4-trifluoro-1-(4-fluorophenyl)-1,3-butanedione (tffb) and 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione (tfnb) as well as auxiliary ligands, 5-nitro-1,10-phenanthroline (5-NO2-Phen), DMF and 2,2'-bipyridine (bpy) have been synthesized and structurally characterized, namely [Dy(5-NO2-Phen)(tfmb)(3)] (1), [Dy(DMF)(2)(tffb)(3)] (2) and [Dy(bpy)(2)(tfnb)(3)]center dot 0.5(1,4-dioxane) (3). The metal ions in 1-3 adopt an approximately square-antiprismatic (SAP) coordination environment with D-4d axial symmetry. The magnetic properties of 1-3 have been investigated, displaying weak out-of-phase AC signals under a zero-DC field. With an applied DC field of 1200 Oe, the quantum tunnelling of the magnetization was suppressed in 1-3 with the pre-exponential factor tau(0) = 5.3 x 10(-7) s and the effective barrier Delta E/k(B) = 83 K for 1 as well as the pre-exponential factor tau(0) = 3.09 x 10(-7) s and the effective barrier Delta E/k(B) = 39 K for 3. Interestingly, for the frequency dependence of the out-of-phase (chi'') of the AC susceptibility of 2, two slow relaxation of the magnetization processes occurred under the applied magnetic field of 1200 Oe, corresponding to the fast relaxation (FR) phase and slow relaxation (SR) phase, respectively. Arrhenius analysis gave the effective energy barrier (Delta E/k(B)) of 55 K and the pre-exponential factor (tau(0)) of 8.23 x 10(-12) for the SR. It is thus very likely that the FR process in complex 2 results from QTM enhanced by dipolar interactions between the Dy ions or the presence of the applied field. The structure-property relationship of some Dy(III) based mononuclear SMMs with the SAP configuration was further discussed.
WOS关键词	ION MAGNET ; SLOW RELAXATION ; LANTHANIDE COMPLEXES ; ANISOTROPY BARRIER ; HIGH-SPIN ; SYMMETRY ; DY ; FIELD ; QUASI-D-5H ; DYNAMICS
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000372187700040
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/171108]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Chen, Sanping
作者单位	1.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China 2.Northwest Univ, Key Lab Synthet & Nat Funct Mol Chem, Minist Educ, Coll Chem & Mat Sci, Xian 710069, Shaanxi, Peoples R China 3.Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Peoples R China 4.Baoji Univ Arts & Sci, Coll Chem & Chem Engn, Baoji 721013, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Sheng,Ke, Hongshan,Shi, Quan,et al. Dysprosium(III) complexes with a square-antiprism configuration featuring mononuclear single-molecule magnetic behaviours based on different beta-diketonate ligands and auxiliary ligands[J]. DALTON TRANSACTIONS,2016,45(12):5310-5320.
APA	Zhang, Sheng.,Ke, Hongshan.,Shi, Quan.,Zhang, Jangwei.,Yang, Qi.,...&Chen, Sanping.(2016).Dysprosium(III) complexes with a square-antiprism configuration featuring mononuclear single-molecule magnetic behaviours based on different beta-diketonate ligands and auxiliary ligands.DALTON TRANSACTIONS,45(12),5310-5320.
MLA	Zhang, Sheng,et al."Dysprosium(III) complexes with a square-antiprism configuration featuring mononuclear single-molecule magnetic behaviours based on different beta-diketonate ligands and auxiliary ligands".DALTON TRANSACTIONS 45.12(2016):5310-5320.