Schäfer Sascha, Schäfer Rolf
Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany.
Chemphyschem. 2008 Sep 15;9(13):1925-9. doi: 10.1002/cphc.200800264.
Endohedral clusters formed from the Zintl ions Pb(10) (2-) and Pb(12) (2-) are particularly stable and therefore suitable for the assembly of larger aggregates. We therefore investigate the formation of Mg-doped lead clusters in the gas phase, and demonstrate that a whole series of new molecular cage clusters of lead can be generated by encapsulation of magnesium. Mass spectrometry reveals that some of the cluster compounds, with one and two Mg atoms attached to the lead clusters, display large intensities compared to the pure lead clusters, which indicates that the compound clusters are particularly stable. The magnesium-doped lead-cluster assemblies were further analyzed within a molecular-beam electric deflection experiment. Almost vanishing permanent dipole moments for MgPb(10-16) support the idea that a single Mg atom could be encapsulated within a highly symmetric lead cage, which results in structures with not only enhanced stability but also increased symmetry compared to the pure lead clusters Pb(N).
由津特耳离子Pb(10)(2-)和Pb(12)(2-)形成的内嵌簇特别稳定，因此适合用于组装更大的聚集体。因此，我们研究了气相中镁掺杂铅簇的形成，并证明通过镁的封装可以生成一系列全新的铅分子笼簇。质谱分析表明，一些在铅簇上附着有一个和两个镁原子的簇化合物，与纯铅簇相比显示出较大的强度，这表明这些化合物簇特别稳定。在分子束电偏转实验中对镁掺杂铅簇组装体进行了进一步分析。MgPb(10 - 16)几乎消失的永久偶极矩支持了这样一种观点，即单个镁原子可以被封装在高度对称的铅笼中，这不仅导致结构稳定性增强，而且与纯铅簇Pb(N)相比对称性也有所提高。
