Effect of Ligand Field Tuning on the SMM Behavior for Three Related Alkoxide-Bridged Dysprosium Dimers
| Autor: | Annie K. Powell, Valeriu Mereacre, Yanhua Lan, Martin Schlageter, Yan Peng, Amer Baniodeh, George E. Kostakis |
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| Rok vydání: | 2015 |
| Předmět: |
Ligand field theory
Tertiary amine 010405 organic chemistry Ligand Nanotechnology 010402 general chemistry 01 natural sciences 0104 chemical sciences Square antiprism Inorganic Chemistry chemistry.chemical_compound Magnetization Crystallography chemistry Alkoxide Alkoxy group Physical and Theoretical Chemistry Coordination geometry |
| Zdroj: | Inorganic chemistry. 55(1) |
| ISSN: | 1520-510X |
| Popis: | 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 Dy(III) ion. Changes in the ligand field environment around the Dy(III) 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 Dy(III) 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 Dy(III)-based systems. |
| Databáze: | OpenAIRE |
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