Highly Facile Strategy for Detecting D 2 O in H 2 O by Porphyrin-Based Luminescent Probes.

Owing to their almost similarities in size, shape, and chemical reactivity, effectively distinguishing deuteroxide (D 2 O) in water (H 2 O) remains an ongoing challenge, and the examples of a D 2 O probe are still quite scarce. Herein, since H 2 O can decrease the lifetime of a singlet oxygen as a vital intermediate and an H/D exchange in the luminescence process of porphyrins, we systematically investigated the enhanced ultraviolet-visible (UV-vis), photoluminescence (PL), and electrochemiluminescence (ECL) of water-soluble tetrakis(carboxphenyl)porphyrin (TCPP) in D 2 O. The findings showed that these luminescent properties had been greatly enhanced with the increase of the D 2 O fraction in water. Consequently, we first developed the highly facile methods of detecting D 2 O in H 2 O by the UV-vis, PL, and ECL of TCPP, respectively. Impressively, the ECL analysis exhibited a great superiority with a lower detection limit of 0.29 nM. The work not only achieves the challenging task of distinguishing between H 2 O and D 2 O but also provides a unique strategy to enhance the luminescent performance of porphyrin.