化学学报 ›› 1998, Vol. 56 ›› Issue (10): 994-998. 上一篇    下一篇

研究论文

固体化合物YbCl~2和AYbI~3(A=Cs, Rb, K)中^1^7^1Yb NMR谱 及核磁屏蔽性质

赵新华;毛希安;吴萍   

  1. 北京师范大学化学系.北京(100875);中国科学院武汉物理研究所.武汉(430071)
  • 发布日期:1998-10-15

The NMR spectra and nuclear magnetic shielding of ^1^7^1Yb^2^+ in YbCl~2 and AYbI~3 (A=Cs, Rb, K) in solid state

Zhao Xinhua;Mao Xian;Wu Ping   

  1. Beijing Normal Univ., Dept of Chem..Beijing(100875);Wuhan Inst Phys., CAS.Wuhan(430071)
  • Published:1998-10-15

首次在室温下测定了^1^7^1Yb在YbCl~2中的化学位移、化学位移各向异性、自旋-晶格弛豫时间、自旋-晶格弛豫时间的各向异性,计算出自旋-自旋弛豫时间。根据TMS(^1H)的绝对屏蔽常数,计算了^1^7^1Yb在YbCl~2和在AYbI~3(A=K,Rb,Cs)中的平均绝对屏蔽常数(σ~i~s~o),逆磁绝对屏蔽常数(σ~i~s~o^d)和顺磁绝对屏蔽常数(-σ~i~s~o^p),并且对^1^7^1Yb的各项屏蔽常数与结构之间的关系进行了讨论。

关键词: 镱化合物, 氯化物, 碘化物, 镱化合物, 碱金属化合物, 铯化合物, 铷化合物, 钾化合物, 化学位移, 各向异性

The static NMR and magic-angle spinning (MAS) NMR experiments on ^1^7^1Yb in YbCl~2 in solid state are reported. The NMR parameters, such as the principal components of the chemical shift (δ~i~s~o, δ ^/^/, δ^⊥), the spin-lattice relaxation time and the parallel and perpendicular components (T~1, T~1^/^/, T~1^⊥) were determined in the solid state and the transverse relaxation time (T~2) was obtained from the natural line width (ν~1~/~2). The absolute average (σ ~i~s~o/10^-^3), diamagnetic (σ~i~s~o^d/10^-^2) and paramagnetic (-σ ~i~s~o^p/10^3), shielding constants of ^1^7^1Yb are 6.027/10^-^3, 1. 1919 and 5.8917 in YbCl~2; 5.9842, 1.2316 and 6.3218 in KYbI~3; 5.9592, 1.2346 and 6.3868 in RbYbI~3, and 5.9259, 1.2382 and 6.4561 in CsYbI~3, respectively. The relationships between the structure and the NMR shielding components are also discussed.

Key words: YTTERBIUM COMPOUNDS, CHLORIDE, IODIDE, YTTERBIUM COMPOUNDS, ALKALI METAL COMPOUNDS, CESIUM COMPOUNDS, RUBIDIUM COMPOUNDS, POTASSIUM COMPOUNDS, CHEMICAL SHIFT, ANISOTROPY

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