Massespektrometrilaboratoriet and Senter for teoretisk og beregningsbasert kjemi (CTCC), Kjemisk institutt, Universitetet i Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway).
Angew Chem Int Ed Engl. 2014 Dec 22;53(52):14407-10. doi: 10.1002/anie.201409444. Epub 2014 Oct 27.
A magnesium complex incorporating a novel metal-CO2 binding motif is spectroscopically identified. Here we show with the help of infrared photodissociation spectroscopy that the complex exists solely in the ClMg(η(2) -O2 C) form. This bidentate double oxygen metal-CO2 coordination has previously not been observed in neutral nor in charged unimetallic complexes. The antisymmetric CO2 stretching mode in ClMg(η(2) -O2 C) is found at 1128 cm(-1) , which is considerably redshifted from the corresponding mode in bare CO2 at 2349 cm(-1) , suggesting that the CO2 moiety has a considerable negative charge (∼1.8 e(-) ). We also employed electronic structure calculations and kinetic analysis to support the interpretation of the experimental results.
光谱鉴定出一种含有新型金属-CO2 结合基序的镁配合物。在这里，我们借助红外光解离光谱表明，该配合物仅以 ClMg(η(2) -O2 C) 的形式存在。这种双齿双核氧金属-CO2 配位以前在中性或带电单金属配合物中都没有观察到。在 ClMg(η(2) -O2 C) 中，反对称 CO2 伸缩模式出现在 1128 cm(-1) ，与裸 CO2 中相应模式（2349 cm(-1) ）相比明显红移，表明 CO2 部分具有相当大的负电荷（∼1.8 e(-) ）。我们还采用电子结构计算和动力学分析来支持对实验结果的解释。
