ELECTRONIC AND STRUCTURAL INVESTIGATIONS OF TECHNETIUM COMPOUNDS BY X-RAY-ABSORPTION SPECTROSCOPY
ELECTRONIC AND STRUCTURAL INVESTIGATIONS OF TECHNETIUM COMPOUNDS BY X-RAY-ABSORPTION SPECTROSCOPY
复制标题
DOI：
10.1021/ic00105a032
复制
发表时间：
1995-01-04
影响因子：
4.6
通讯作者：
REICH, T
中科院分区：
文献类型：
--
作者：
ALMAHAMID, I;BRYAN, JC;REICH, T
X 射线吸收近边结构光谱已被用来确定一系列含有各种形式氧化态 Tc 的化合物中锝 K 边的化学位移。边缘位置从 Tc 金属到 NH4TcO4 跨度为 19.9 eV。观察到化学位移和形式氧化态之间的强相关性。 Tc-2(CO)(10) 的扩展 X 射线吸收精细结构 (EXAFS) 光谱表明，沿 Tc-C-矢量的多重散射比直接 Tc..O 散射更重要。 EXAFS 显示 TcO2 具有扭曲的金红石结构，最接近的 Tc-Tc 距离为 2.61 埃。这根据过渡金属二氧化物键合的 Goodenough 模型得到了合理化。
X-ray absorption near edge structure spectroscopy has been used to establish the chemical shifts of the technetium K edge ina range of compounds containing Tc in a variety of formal oxidation states. The edge positions span 19.9 eV from Tc metal to NH4TcO4. Strong correlation between chemical shift and formal oxidation state is observed. Extended X-ray absorption fine structure (EXAFS) spectroscopy of Tc-2(CO)(10) indicates that multiple scattering along the Tc-C-vector is more important than direct Tc..O scattering. TcO2 is shown by EXAFS to possess a distorted rutile structure with a closest Tc-Tc distance of 2.61 Angstrom. This is rationalized in terms of the Goodenough model for bonding in transition metal dioxides.