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首页> 外文期刊>Chemistry: A European journal >Mass spectrometric characterization and gas-phase chemistry of self-assembling supramolecular squares and triangles
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Mass spectrometric characterization and gas-phase chemistry of self-assembling supramolecular squares and triangles

机译：自组装超分子正方形和三角形的质谱表征和气相化学

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A detailed mass spectrometric characterization of self-assembling polynuclear metal complexes is described. The complexes can only be ionized as intact species under a surprisingly narrow range of conditions by electrospray ionization. Comparison with the results froM NMR experiments shows that several and triangles (such as trends in bond energies, ligand-exchange reactions, or square-triangle equilibria) are qualitatively reflected in the gas-phase data.Consequently, mass spectrometry represents a valuable method for the characterization of these compounds. Nevertheless, the formation of unspecific aggregates during the ionization process occurs and its implications are discussed. Beyond the chemistry in solution, the fragmentation pathways of these complexes in the gas phase have been studied by infrared multiphoton dissociation (IRMPD) experiments.The results of IRMPD studies allow us to draw conclusions with respect to the structure and energetics of fragmentation products. In this tandem MS experiment, reaction pathways can be observed directly which can hardly be analyzed in solution. According to these results, the equilibration of triangles and squares involves the supramolecular analogue of a neighboring - group effect.
机译：描述了自组装多核金属配合物的详细质谱表征。仅在极窄的条件范围内，才能通过电喷雾电离将络合物作为完整物种电离。通过NMR实验与结果的比较表明，气相数据定性地反映了几个和三角形（例如键能趋势，配体交换反应或方形三角形平衡），因此质谱法是一种有价值的方法这些化合物的表征。然而，在电离过程中会发生非特异性聚集体的形成，并对其含义进行了讨论。除了溶液中的化学作用之外，还通过红外多光子离解（IRMPD）实验研究了这些配合物在气相中的裂解途径。IRMPD研究的结果使我们能够得出有关裂解产物的结构和能量的结论。在此串联质谱实验中，可以直接观察到反应路径，而该路径几乎无法在溶液中进行分析。根据这些结果，三角形和正方形的平衡涉及相邻基团效应的超分子类似物。

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