Characterization of the Side-On Coordinated Bissuperoxo Complexes of Aluminum FAl(O<sub>2</sub>)<sub>2</sub>, ClAl(O<sub>2</sub>)<sub>2</sub>, and BrAl(O<sub>2</sub>)<sub>2</sub> with Triplet Electronic Ground States: A Combined Matrix IR and Quantum Chemical Study
作者:Jan Bahlo、Hans-Jörg Himmel、Hansgeorg Schnöckel
DOI:10.1021/ic020208g
日期:2002.8.1
centers. Our IR spectroscopic results taking in the effect of isotopic substitution ((16)O/(18)O) allied with quantum chemical calculations show that the O(2) moieties in these complexes are side-on coordinated, leading to an overall C(2)(v)() symmetry of the complexes and a spin multiplicity of 3. The O-O distance of about 1.366 A argues for the presence of superoxide units. The force constants are, however
基质分离已用于研究AlX(X = F,Cl或Br)与O(2)的光解诱导反应。发现过氧和双过氧化合物XAlO(2)和XAl(O(2))(2)是这些反应的产物。尽管过氧物种XAlO(2)已在单独的工作中得到了解决,但我们在此集中于bissuperoxo配合物XAl(O(2))(2),据我们所知,这是此类具有Al中心的配合物的第一个示例。我们的红外光谱结果考虑了同位素取代((16)O /(18)O)与量子化学计算的联合作用,表明这些配合物中的O(2)部分是侧向协调的,从而导致总体C( 2)(v)()的对称性和3的自旋多重性。OO距离约1.366 A证明存在超氧化物单元。力常数为 略小于超氧阴离子的预期值,这表明不能简单地基于离子模型描述配合物中的键。有趣的是,观察到化合物的光诱导分子内同位素加扰过程导致XAl((16)O(2))((18)O)(2)同位素异构体部分转化为XAl((16)O(18)O)