• 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, Antiferromagnetic Ordering, and Metamagnetism in Mn~(II)(H_2dapsc)-Fe~(III)(CN)_6 Chain Complex with Highly Anisotropic Fe-CN-Mn Spin Coupling
【24h】

Slow Magnetic Relaxation, Antiferromagnetic Ordering, and Metamagnetism in Mn~(II)(H_2dapsc)-Fe~(III)(CN)_6 Chain Complex with Highly Anisotropic Fe-CN-Mn Spin Coupling

机译：慢磁性松弛，反式磁性排序和Mn〜（II）（H_2DAPSC）-FE〜（III）（CN）_6链复合物，具有高各向异性FE-CN-MN自旋耦合

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

Reactions of [Mn(H_2 dapsc)Cl_2]·H_2O (dapsc=2,6-diacetylpyridine bis(semicarbazone)) with K_3[Fe(CN)_6] and (PPh_4)_3[Fe(CN)_6] lead to the formation of the chain polymeric complex {[Mn(H_2dapsc)][Fe(CN)_6][K(H_2O)_(3.5)]}n·1.5nH_2O (1) and the discrete pentanuclear complex {[Mn(H_2dapsc)]_3[Fe(CN)_6]_2(H_2O)_2}·4CH_3OH·3.4H_2O (2), respectively. In the crystal structure of 1 the high-spin [MnII(H_2 dapsc)]~(2+) cations and low-spin hexacyanoferrate(III) anions are assembled into alternating heterometallic cyanobridged chains. The K~+ ions are located between the chains and are coordinated by oxygen atoms of the H_2dapsc ligand and water molecules. The magnetic structure of 1 is built from ferrimagnetic chains, which are antiferromagnetically coupled. The complex exhibits metamagnetism and frequency-dependent ac magnetic susceptibility, indicating singlechain magnetic behavior with a Mydosh-parameter f=0.12 and an effective energy barrier (Ueff/kB) of 36.0K with t0= 2.34V10-11s for the spin relaxation. Detailed theoretical analysis showed highly anisotropic intra-chain spin coupling between [Fe~(III)(CN)_6]~(3-) and [MnII(H_2 dapsc)]~(2+) units resulting from orbital degeneracy and unquenched orbital momentum of [Fe~(III)(CN)_6]~(3-) complexes. The origin of the metamagnetic transition is discussed in terms of strong magnetic anisotropy and weak AF interchain spin coupling.
机译：[Mn（H_2 DAPSC）CL_2]·H_2O（DAPSC = 2,6-二乙酰吡啶双（氨基咔啉）用K_3 [Fe（CN）_6]和（PPH_4）_3 [Fe（CN）_6]导致形成链聚合物络合物{[Mn（H_2DAPSC）] [Fe（CN）_6] [k（H_2O）_（3.5）]} N·1.5NH_2O（1）和离散的五核络合物{[Mn（H_2DAPSC）] _ 3 [Fe（CN）_6] _2（H_2O）_2}·4CH_3OH·3.4H_2O（2）。在1的晶体结构中，高旋转[MnII（H_2 DAPSC）]〜（2+）阳离子和低旋转六氰基甲甲酸酯（III）阴离子被组装成交替的杂象氰基丙烯链链。 K〜+离子位于链之间，并由H_2DAPSC配体和水分子的氧原子配位。磁性结构为1采用亚铁磁性链构建，其是反铁磁性耦合的。该复杂展示了元磁性和频率依赖性的交流磁性敏感性，表明具有MyDosh参数F = 0.12的单打磁性，以及36.0k的有效能量屏障（UEFF / KB），T0 = 2.34V10-11用于旋转松弛。详细的理论分析显示，由轨道退化和未充分的轨道动量导致的[Fe〜（III）（CN）（CN）（CN）（CN）（CN）和[MnII（H_2 DAPSC）]〜（2+）单位之间的高各向异性内旋旋偶联[Fe〜（III）（CN）_6]〜（3-）复合物。在强磁各向异性和弱AF中间自旋耦合方面讨论了元磁转变的起源。

著录项

相似文献

  • 外文文献
  • 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