Soft salts based on platinum(II) complexes with high emission quantum efficiencies in the near infrared region for in vivo imaging.

Two soft salts (S1 and S2) based on platinum(ii) complexes with a near-infrared emission have been designed and synthesized. It has been demonstrated that S2 has a high photostability and a low cytotoxicity, and it has been successfully applied to in vivo imaging for the first time.