Shafikov, Marsel Z.; Suleymanova, Alfiya F.; Kutta, Roger J.; Brandl, Fabian; Gorski, Aleksander; Czerwieniec, Rafal published an article in 2021. The article was titled 《Dual emissive dinuclear Pt(II) complexes and application to singlet oxygen generation》, and you may find the article in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices.Recommanded Product: 2-Bromo-5-methylpyridine The information in the text is summarized as follows:
Room-temperature dual emission consisting of spectrally separated fluorescence and phosphorescence is highly attractive as a design principle for ratiometric sensing materials, for example, for detection of dioxygen. Compounds susceptible to emission quenching by dioxygen, producing dioxygen in electronically excited states, are also used as photosensitizers for singlet O generation. Combination of the dual emission behavior and efficient energy transfer from one of the emitting states (triplet state) of the dual emissive compound to mol. dioxygen can result in potent photosensitizers easily traceable by fluorescence spectroscopy, which may be advantageous for instance in biol. studies. Herein, the authors present two Pt(II) complexes 1 and 2 of dinuclear structure which exhibit green fluorescence with sub-nanosecond lifetimes and near IR (NIR) phosphorescence with microsecond lifetimes. Such properties are achieved via the design of a strongly π-excessive ditopic ligand with a NĈ-CN̂ coordinating mode that bridges the metal centers. The ligand centered character of the lowest excited singlet (S1) and triplet (T1) states leads to strong exchange interaction of the unpaired electrons and hence to large energy separation ΔE(S1-T1) amounting to 0.6 eV for 1 and 0.7 eV for 2, resp. The large energy gap ΔE(S1-T1) and weak metal contribution to the states S1 and T1 results in unusually long intersystem crossing (ISC) times τISC(S1 → T1) of 27.5 ps (1) and 65.2 ps (2), resp., as determined by transient absorption spectroscopy. Owing to the slow ISC, the T1 → S0 phosphorescence of both 1 and 2 is accompanied by S1 → S0 fluorescence of comparable intensity. The large gap ΔE(S1-T1) provides also a good optical separation of the two emissions. The phosphorescence signal is efficiently quenched in the presence of dioxygen, which is manifested in both the lower relative intensity and shorter decay time of phosphorescence. Thus, the compounds show high potential as ratiometric dioxygen sensing materials. The singlet O photogeneration efficiencies of complexes 1 and 2, measured in air saturated CH2Cl2, are as high as φΔ ≈ 0.77 ± 0.1 and 0.57 ± 0.1, resp. Thus, the compounds represent efficient singlet O photosensitizers.2-Bromo-5-methylpyridine(cas: 3510-66-5Recommanded Product: 2-Bromo-5-methylpyridine) was used in this study.
2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. Recommanded Product: 2-Bromo-5-methylpyridine