Faculty of Chemistry, Adam Mickiewicz University, Poznań, Poland.
J Am Soc Mass Spectrom. 2010 Apr;21(4):545-9. doi: 10.1016/j.jasms.2009.12.018. Epub 2010 Jan 7.
The stability of the mixed-ligand complex formed by amino-benzo-15-crown-5 and nitro-benzo-15-crown-5, with a metal cation, NH(2)B15C5 + NO(2)B15C5 + K, was found to be enhanced by pi-stacking interactions. This conclusion was deduced by comparison of the abundance of the mixed-ligand complex with the abundances of homo-ligand complexes ((NH(2)B15C5)(2) + K, (NO(2)B15C5)(2) + K), as well as with those of 1:1 complexes (NH(2)B15C5 + K, NO(2)B15C5 + K). Some solvents and some metal cations with large radii were also found to prevent the existence of pi-stacking interactions.
研究发现，氨苯并-15-冠-5 和硝基苯并-15-冠-5 与金属阳离子NH(2)B15C5 + NO(2)B15C5 + K 形成的混合配体络合物的稳定性通过π堆积相互作用得到增强。这一结论是通过比较混合配体络合物的丰度与同系配体络合物(NH(2)B15C5)(2) + K、(NO(2)B15C5)(2) + K的丰度以及 1:1 络合物NH(2)B15C5 + K、NO(2)B15C5 + K的丰度得出的。一些溶剂和一些具有大半径的金属阳离子也被发现会阻止π堆积相互作用的存在。
