Molecular structure of [(trien)Zn(im)Zn(trien)](ClO_4)_3 complex and ESR spectra of its single-crystal doped with [(trien)Cu(im)Zn(trien)l(ClO_4)_3 complex

The crystal structure of the title complex was measured, in which the two zinc atoms with coordination polyhedron of distorted tetragonal pyramid (TP) are bridged by an imidazolate in the apical position of the TP forming a dimer. The isomorphous [(trien)Cu(im)Zn(trien)](ClO4)3·H2O complex was doped in the title complex and the recorded single-crystal ESR spectra by fitting gave two sets of the principal values of g and A tensors, which were assigned to the physically distinct sites of the two magnetically equivalent molecules in the unit cell. Lattice distortion at the Cu(II) ion sites and the bonding parameters of Cu(II) ions are further calculated, and the bonding nature of Cu(II) ions is discussed.     

纳米FeAl合金的磁共振谱分析

在与晶粒组元相当的包裹纳米FeAl晶粒的无序界面或/和表面组元中,存在Fe-Al-Fe电子的超交换作用或/和Fe-Fe交换作用,使多晶FeAl合金因晶粒纳米化出现非磁性—磁性转变.X波段(频率为9.48GHz)的电子自旋共振(ESR)实验表明多晶FeAl合金没有磁共振信号.纳米晶样品的铁磁共振(FMR)信号是一个线宽ΔH_pp为8×10⁴A/m以上的宽峰.还观测到纳米晶体样品中Fe²⁺离子的ESR精细结构双峰,两峰间隔为1.316×10关键词：     

[NH3Pr^i]6[Mo8O28(CHO)2].2H2O单晶紫外光照后的电子顺磁共振研究

本文研究了[NH3Pr^4]6[Mo8O28(CHO)2].2H2O单晶在紫外光辐照后的电子顺磁共振谱法. 观察到三组包含质子超精细结构的EPR谱线. 线组I和II分别归属于正文文中局部八面体顺磁中心A和B, 而线组III则可能归属于一种不稳定的顺磁中心.从EPR数据使用最小二乘拟合技术得到了精确的各向异性g张量主值、A张量主值,以及它们的主轴相对于实验坐标的方向余弦. 由A值估算了电子自旋密度. 结果表明Mo未成对电子主要处于Mo的d轨道, 并与H原子轨道发生直接偶合作用.     

(Bu_4N)_2[Cu/Pd(dmit)_2]单晶的ESR研究

本文将(Bu_4N)_2[Cu(dmit)_2]掺杂在(Bu_4N)_2[Pd(dmit)_2]中制备了(Bu_4N)_2[Cu/Pd(dmit)_2]单晶,测定其不同取向的ESR谱,经拟合程序处理确定了晶体中g张量及A张量主值和方向余弦,由此讨论了[Cu(dmit)_2]~(2-)的电子结构,并分析了两个磁性不等价晶位的微观本质。     

Na2SnO3系催化剂表面吸附氧的EPR研究

以Na_2SnO_3系甲烷氧化偶联催化剂中性能较好的5%Li_2SO_4-Na_2SnO_3样品为主要研究对象, 用电子顺磁共振(EPR)方法对表面吸附氧及其与甲烷的作用进行了研究, 实验表明: 样品在氧气氛中处理后,得到可归属为表面吸附超氧负离子O_2~-的顺磁信号, 在300 ℃以上温度条件下吸附氧后, 可产生这种表面氧物种, 该物种在室温、1.33×10~(-2) Pa真空条件下能稳定存在, 700 ℃与甲烷作用后顺磁信号显著减弱, 因而催化剂表面的O_2~-物种可能起着活化甲烷的作用.     

ESR Investigation of Single Crystal of (Bu_4N)_2[Cu/Pd(dmit)_2]

By incorporating (Bu4N)2[Cu(dmit)2] with the diamagnetic host complex (Bu4N)2[Pd (dmit)2], single crystal of (Bu4N)2[Cu/Pd(dmit)2] is obtained. Its ESR spectra of various orientations are recorded. The principal values of g and A tensors and their direction cosines are computed using a least-squares fitting procedure, and based on which the molecular orbital of unpaired electron in [Cu(dmit)2]2- is described. The essence of the two magnetically non-equivalent sites is also revealed.     

MOLECULAR STRUCTURES AND SINGLE CRYSTAL ESR SPECTRA OF IMIDAZO-LATE-BRIDGED Co(Ⅲ)-Cu(Ⅱ)-Co(Ⅲ)AND Co(Ⅲ)-Zn(Ⅲ)-Co(Ⅲ) COMPLEXES

The structures of the heterotrinuclear complexes, [(NH_3)_5ColmCu(dien)ImCo(NH_3)_5]-(C10_4)_6·4H_20 and [(NH_3)_5CoImZn(dien)ImCo(NH_3)_5]-(ClO_4)_6·4H_2O, are reported. Co--Cu--Cocrystallizes in the monoclinic space group C2/c with a =32.414(4), b= 9.421(1), c=15.167(5)?,β= 90.91(2)°, Z=4 and Co--Zn--Co in the same space group with a = 32.578(2), b = 9.419(1), c = 15.125(3)?, β=91.10(1)°Z=4. The Cu(Ⅱ) and Zn(Ⅱ) geometriesare intermediate between a trigonal bipyramid and a square pyramid,the Co(Ⅲ) is a-hexagonal coordination and the dien ligand shows a disordered contribution in the respectivestructure.The magnetic properties of Co--Cu--Co are investigated. From the single crystalESR spectra studies, the anisotropic g and A tensors and electronic spin-density of Co--Cu--Co are obtained and the nature of the bonding for Cu~(2+) is discussed.     

BaCl2中Eu2+的电子自旋共振研究

制备和用X射线分析BaCl₂:Eu微晶的结构,并测量它的电子自旋共振(ESR)谱,结构分析和ESR谱都表明,替代Ba²⁺的Eu²⁺离子是处在轴对称的正交晶场中;并用抽对称的自旋哈密顿量和晶场哈密顿量对ESR实验数据进行拟合,求得在正交对称的BaCl₂中的Eu²⁺的自旋哈密顿参数;还发现Eu替代Ba²⁺的掺杂浓度的饱和值为0.34mol％。 关键词：     

自旋波线宽的测量

本文描述了磁有序材料在垂直激励和平行激励下产生第一阶非稳定性微波阈值磁场的测试装置及有关测试技术,在平行激励下通过阈值场的测量可以获得自旋波线宽,同时给出了在室温、X波段条件下对YIG单晶小球进行自旋波线宽测量的结果,与同类测量进行比较,两者相当一致。 关键词：