chemical studies. The compound Tc2Cl4(PMe3)4 crystallizes in the monoclinic space group C2/c [a = 17.9995(9) Å, b = 9.1821(5) Å, c = 17.0090(9) Å, β = 115.4530(10)°] and is isostructural to M2Cl4(PMe3)4 (M = Re, Mo, W) and to Tc2Br4(PMe3)4. The metal−metal distance (2.1318(2) Å) is similar to the one found in Tc2Br4(PMe3)4 (2.1316(5) Å). The calculated molecular structures of the ground states are in excellent
化合物Tc 2 Cl 4(
PMe 3)4和Tc 2 Br 4(
PMe 3)4是由(n -Bu 4 N)2 Tc 2 X 8(X = Cl,Br)和
三甲基膦之间的反应形成的。Tc(II)双核物种通过单晶XRD,紫外可见光谱和循环伏安技术进行了表征,并将结果与从密度泛函理论和多构型(CASSCF / CA
SPT2)量子
化学研究中获得的结果进行了比较。化合物Tc 2 Cl 4(
PMe 3)4在单斜空间群C 2 / c中结晶[ a = 17.9995(9)Å,b = 9.1821(5)Å,c = 17.0090(9)Å,β= 115.4530(10)°],对M同构2 Cl 4(
PMe 3)4(M = Re,Mo,W)和Tc 2 Br 4(
PMe 3)4。
金属与
金属的距离(2.1318(2)Å)与Tc 2 Br 4(
PMe 3)4中的
金属距离相似(2.1316(5)Å)。计算出的基态分子结构与实验确定的结构非常吻合。Tc