MS32-04 - Phosphorus Can Do More: p-p Stacking of Planar Aromatic P5-rings

Eugenia Peresypkina (University of Regensburg, Germany)

The directed non-bonding interactions play an important role in modern supramolecular chemistry. Concerning phosphorus, so-called pnictogen bonding is usually mentioned in this context [1]. However, cyclic polyphosphorus ligands open new perspectives for the supramolecular chemistry. Since many years we have been using pentaphosphaferrocenes [CpRFe(η5-P5)] (CpR=η5-C5R5, R=Me, CH2Ph, etc.) as building blocks to obtain coordination polymers and giant supramolecules [2-5]. The X-ray diffraction studies proved that cyclo-P5- planar aromatic ligand of the pentaphosphaferrocene is capable of the π-π stacking interactions with the other aromatic π-systems. The interplanar spacing of 3.5-3.8 Å, parallel arrangement of the aromatic fragments as well as 31P MAS-NMR data show the presence of intermolecular interaction. These interactions influence the orientation of the guest molecules in the central cavities of the supramolecules [2-4] and the crystal packing in the coordination polymers [5].

Financial support from the ERC grant ADG 339072 is gratefully acknowledged. The research was partly done at the light source PETRA III at DESY.

References

[1] L. Brammer (2017) Faraday Discuss. 203, 485.

[2] E. Peresypkina, et al (2016) Structure and Bonding 174, 321.

[3] E. Peresypkina, et al (2018) Chem.-A Eur. J., 24, 2503.

[4] H. Brake, et al (2019) Chem. Sci. 10, 2940.

[5] M. Elsayed Moussa, et al (2018) Eur. J. Inorg. Chem., 2689.