A cationic water-soluble dipicolylamine-containing alkynylplatinum(II) terpyridine complex has been synthesized and demonstrated to exhibit a strong binding affinity towards Zn2+ whereas its zinc-bound adduct is found to demonstrate the capability of recognizing PPi. Notably, the orchestrated sequential addition of Zn2+ and PPi to a solution of the complex has been shown to trigger the emergence of the respective triplet metal-to-ligand charge transfer (3MLCT) emission (at ca. 600 nm) and triplet metal−metal-to-ligand charge transfer (3MMLCT) emission (at ca. 770 nm). One of the distinct features of this current platinum(II)-based probe is that it can exhibit emission in the near-infrared (NIR) region, which is advantageous with regard to autofluorescence and interference issues as well as better penetration in body tissue. More interestingly, as evidenced by molecular modeling and various spectroscopic and spectrometric studies, a PPi anion is found to be capable of bridging two zinc-bound complex molecules in a clip-shaped fashion, which is further oligomerized through intermolecular Pt···Pt and π−π stacking interactions to form nanofibers with a hexagonal columnar phase. This work provides important insights into not only the construction of aesthetically pleasing supramolecular architectures but also the multifunctional probes, which offer great promise to the fields of biosensing and chemical sensing.

A Platinum(II)-Based Host-Guest Coordination-Driven Supramolecular Coassembly-Assisted by Pt···Pt and π−π Stacking Interactions: A Dual-Selective Luminescence Sensor for Cations and Anions

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