...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and characterization of a flexible metal organic framework generated from Mn-III and the 4,4 '-bipyrazolate-ligand
【24h】

Synthesis and characterization of a flexible metal organic framework generated from Mn-III and the 4,4 '-bipyrazolate-ligand

机译：柔性金属有机骨架的合成与表征，由Mn-III和4,4'-BiPyrazolate-LigAnd产生的柔性金属有机骨架

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

The synthesis and crystal structure of a novel metal organic framework, constructed from Mn-III, the 4,4-bipyrazolate (BPZ) ligand and bridging hydroxyl groups is presented in this work. The network topology is identical to M-CFA-6 (M = Fe, Ga), but in the case of Mn-CFA-6, the structure crystallizes in the monoclinic crystal system due to the Jahn-Teller effect of the high spin d(4) manganese(iii) centers. Thermal treatment of Mn-CFA-6 leads to decomposition of the framework above 150 degrees C. The porosity of Mn-CFA-6 was measured by carbon dioxide sorption, since solvent exchange and removal of the occluded solvent molecules leads to a compression of the pores. Electronic spectra of Mn-CFA-6 reveal two distinct absorption bands that are assigned to the two different manganese(iii) centers as revealed by the single crystal structure analysis. Furthermore, SQUID measurements exhibit ferromagnetic behaviour of Mn-CFA-6 below the magnetic ordering at 45 K and antiferromagnetic coupling above this temperature. Evaluation of the paramagnetic region by the Curie-Wei ss formula reveals an effective moment of 4.8(B), which is very close to the spin-only value of Mn-III centers.
机译：本工作中提出了由Mn-III，4,4-双唑酯（BPZ）配体和桥接羟基构成的新型金属有机骨架的合成和晶体结构。网络拓扑与M-CFA-6（M = Fe，Ga）相同，但在Mn-CFA-6的情况下，由于高旋旋的jahn-theler效应，该结构在单斜晶体系中结晶（4）锰（III）中心。 Mn-CFA-6的热处理导致框架的分解为150℃。通过二氧化碳吸附测量Mn-CFA-6的孔隙率，因为溶剂交换和去除闭塞溶剂分子导致压缩毛孔。 Mn-CFA-6的电子光谱显示出两种不同的吸收带，其分配给两个不同的锰（III）中心，如单晶结构分析所揭示的。此外，鱿鱼测量表现出低于磁性排序的Mn-CFA-6的铁磁性行为，并在该温度以上的反铁磁耦合。通过居里-WEI SS公式评估顺磁区显示有效时刻为4.8（b），这非常接近MN-III中心的旋转值。

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