Effect of Ligand Field Tuning on the SMM Behavior for Three Related Alkoxide-Bridged Dysprosium Dimers
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- 作者：Yan Peng ; Valeriu Mereacre ; Amer Baniodeh ; Yanhua Lan ; Martin Schlageter ; George E. Kostakis ; Annie K. Powell
- 刊名：Inorganic Chemistry
- 出版年：2016
- 出版时间：January 4, 2016
- 年：2016
- 卷：55
- 期：1
- 页码：68-74
- 全文大小：416K
- ISSN：1520-510X
文摘
The synthesis and characterization of three Dy2 compounds, [Dy2(HL1)2(NO3)4] (1), [Dy2(L2)2(NO3)4] (2), and [Dy2(HL3)2(NO3)4] (3), formed using related tripodal ligands with a central tertiary amine bearing picolyl and alkoxy arms, 2-[(2-hydroxy-ethyl)-pyridin-2-ylmethylamino]-ethanol (H2L1), 2-(bis-pyridin-2-ylmethylamino)-ethanol (HL2), and 2-(bis-pyridin-2-ylmethylamino)-propane-1,3-diol (H2L3), are reported. The compounds are rare examples of alkoxide-bridged {Dy2} complexes and display capped square antiprism coordination geometry around each DyIII ion. Changes in the ligand field environment around the DyIII ions brought about through variations in the ligand donors can be gauged from the magnetic properties, with compounds 1 and 2 showing antiparallel coupling between the DyIII ions and 3 showing parallel coupling. Furthermore, slow relaxation of the magnetization typical of SMM behavior could be observed for compounds 2 and 3, suggesting that small variations in the ligand field can have a significant influence on the slow relaxation processes responsible for SMM behavior of DyIII-based systems.