dichloromethane and characterized by X-ray absorption fine structure spectroscopy and UV-vis spectroscopy. Analysis of the data gives a Tc-Tc distance of 2.16(1) A and a Tc-Br distance of 2.48(1) A. The Tc(III) oxidation state was inferred by the position of the edge absorption, which reveals a shift of 12 eV between (n-Bu4N)2Tc2Br8 and NH4TcO4. The analogous shift between (n-Bu4N)2Tc2Cl8 and NH4TcO4 is 11
化合物(n-Bu4N)2Tc2Br8是通过(n-Bu4N)2Tc2Cl8与HBr(g)在
二氯甲烷中复分解制得的,并通过X射线吸收精细结构光谱和UV-vis光谱进行了表征。数据分析得出Tc-Tc距离为2.16(1)A,Tc-Br距离为2.48(1)A。通过边缘吸收的位置推断出Tc(III)的氧化态,这表明发生了位移(n-Bu4N)2Tc2Br8与NH4TcO4之间的电势为12 eV。(n-Bu4N)2Tc2Cl8和NH4TcO4之间的相似位移为11 eV。Tc2Br8(2-)在
二氯甲烷中的紫外-可见光谱在13,717 cm(-1)处表现出特征δ->δ*跃迁。比较了M2X8(2-)(M = Re,Tc; X = Cl,Br)紫外可见光谱,并讨论了δ->δ*跃迁的位置。