Sulfonium-Pincer Ligands Flexibility in Pt(II) Complexes

23 November 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The coordination chemistry of sulfonium cations, dormant since the early eighties, was recently revived when we reported the synthesis and characterization of the first Rh(I) and Pt(II) pincer sulfonium complexes. With the Pt(II) complexes, we had noticed the hemilability of our sulfonium pincer ligands, further explored here. This hemilability led to mononuclear bidentate complexes with both the aromatic and aliphatic sulfonium ligands. With the latter, due to its flexibility, dimeric structures of two different kinds were also allowed. The more rigid aromatic backbone adopted only a mononuclear bidentate mode, leading to a dynamic equilibrium between two asymmetric geometries. Computational study of this process predicted a local energy minimum for a pincer sulfonium-PtCl complex. However, the activation energy of its formation, as a possible intermediate, was found to be too high and indeed was not observed experimentally. Nevertheless, such PtCl complex was prepared and characterized by XRD. Although its S-Pt bond was significantly shorter than in its PtMe analog, the former was easily dissociated in coordinating solvents. It seems that lowering the dz2 orbital in this complex by strong π-back donation, renders the Pt(II) nucleus more susceptible to nucleophilic attacks. This comprehensive study should lay the ground for future applications of pincer sulfonium-Pt(II) complexes in π-acid catalysis.


Sulfonium cations
Cationic ligands
Hemilabile ligands
Pi-acidic ligands


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.