• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Slow magnetic relaxation in condensed versus dispersed dysprosium(III) mononuclear complexes
【24h】

Slow magnetic relaxation in condensed versus dispersed dysprosium(III) mononuclear complexes

机译：浓缩versus和分散dispersed（III）单核配合物中的慢磁弛豫

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reaction of the ligands 4,5-bis(propylthio)tetrathiafulvalene-2-(2-pyridyl) benzimidazole (L~1) and 4,5-bis(propylthio)tetrathiafulvalene-2-(2- pyridyl)-3-(2-pyridinylmethyl)benzimidazole (L~2) with Dy(hfac) _3×2 H_2O (hfac=1,1,1,5,5,5-hexafluoroacetylacetonate) gave mononuclear complexes [Dy(hfac)_3(L~1)] (1) and [Dy(hfac)_3(L~2)] (2). In both compounds the Dy ~(III) ion is surrounded by six oxygen and two nitrogen atoms. Complex 1 displays single-ion magnet (SIM) behaviour only in solution (Δ=12(1) K and τ_0=1.9(4)×10~(-6) s), while complex 2 is a SIM in both solution (Δ=15(2) K and τ_0=1.5(3)×10 ~(-6) s) and solid state (Δ=17(2) K and τ_0=9.5(2) ×10~(-6) s). The SIM behaviour is obtained if the hydrogen bond is broken by dissolution (1 in solution) or by alkylation (2). Multiple relaxation processes were identified for 2 with two competing processes: a fast one in zero field and a slow one for fields higher than 500 Oe. The two processes coexist for intermediate applied magnetic field. Magnetic-dilution and frozen-solution measurements led to the conclusion that the origin of these multiple relaxation processes is not due to the property of a single molecule.
机译：配体4,5-双（丙硫基）四硫富瓦烯-2-（2-吡啶基）苯并咪唑（L〜1）与4,5-双（丙硫基）四硫富瓦烯-2-（2-吡啶基）-3-（2）的反应-吡啶基甲基）苯并咪唑（L〜2）与Dy（hfac）_3×2 H_2O（hfac = 1,1,1,5,5,5-六氟乙酰丙酮酸酯）给出单核络合物[Dy（hfac）_3（L〜1）] （1）和[Dy（hfac）_3（L〜2）]（2）。在这两种化合物中，Dy〜（III）离子被六个氧和两个氮原子包围。复合体1仅在溶液中（Δ= 12（1）K和τ_0= 1.9（4）×10〜（-6）s）显示单离子磁体（SIM）行为，而复合体2在两种溶液中均为SIM（Δ = 15（2）K和τ_0= 1.5（3）×10〜（-6）s）和固态（Δ= 17（2）K和τ_0= 9.5（2）×10〜（-6）s）。如果氢键通过溶解（在溶液中为1）或通过烷基化（2）而断裂，则可获得SIM行为。对于2个，有两个相互竞争的过程被确定为多个弛豫过程：零场中一个快速的过程，而高于500 Oe时一个慢的过程。这两个过程共存于中间施加的磁场中。磁稀释和冷冻溶液测量得出的结论是，这些多重弛豫过程的起源不是由于单个分子的性质。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号