We are interested in bulk synthesis of the Au20 pyramidal cluster [1] with phosphine ligands. We report the efficient synthesis and separation of a new Au22(C28H28OP2)7 nanocluster with 25% yield based on Au. The purity and formula are confirmed by high-resolution electrospray ionization mass spectrometry. UV-Vis-NIR spectroscopy shows absorption peaks at around 315 nm, 385 nm and 465 nm, which is different from the previously reported Au22(C32H36P2)6 nanocluster [2]. Collision-induced dissociation further confirms the differences between the two Au22 nanoclusters. The current work will help our understanding of the ligand effects on phosphine-protected gold nanoclusters. [1] Li, J., Li, X., Zhai, H. J., Wang, L. S. (2003). Au20: A tetrahedral cluster. Science, 299(5608), 864-867. [2] Chen, J., Zhang, Q. F., Bonaccorso, T. A., Williard, P. G., Wang, L. S. (2013). Controlling gold nanoclusters by diphospine ligands. Journal of the American Chemical Society, 136(1), 92-95.

Synthesis of diphosphine-protected Au22(C28H28OP2)7 nanocluster

251st National Meeting (2016)

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