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• W3204335013 abstract "A new vapochromic, proton-conductive Pt(II) complex, [PtBr(tpypyH)]Br2 ([1Br-H]Br, tpypy = 2,2′: 6′,2′′-terpyridine-4′,4′′′-pyridine) was synthesized to improve the proton conductivity and thermal stability of the Cl− analogue, [PtCl(tpypyH)]Cl2 ([1Cl-H]Cl). The effects of halide replacement on the photophysical properties of the complex differed in the solution and solid states; the metal-to-ligand charge transfer (MLCT) absorption band of [1Br-H]Br in the solution state appeared at a longer wavelength than that of [1Cl-H]Cl owing to the stronger π-donation of Br−. In contrast, the metal-metal-to-ligand charge transfer (MMLCT) emission of [1Br-H]Br appeared at a shorter wavelength than that of [1Cl-H]Cl, which is consistent with the longer Pt⋯Pt stacking distance in [1Br-H]Br. [1Br-H]Br exhibited relative humidity-dependent proton conductivity and water vapor induced vapochromic luminescence; the conductivity was comparably higher than that of [1Cl-H]Cl, but slightly lower in the high relative humidity (RH) region above 80%, likely due to the lower hydration number of [1Br-H]Br. HBr release from [1Br-H]Br occurred at a higher temperature than HCl release from [1Cl-H]Cl, suggesting the superior thermal stability of the HBr adduct. This study demonstrates the crucial role of halide anions in attenuating both the vapochromic and proton conduction behavior of Pt(II) complexes. A highly proton-conductive and vapochromic luminescent HBr adduct of a Pt(II)-terpyridine complex is reported. The hydrophilicity of the counter halide anion significantly affects the conductivity under highly humid conditions, while the coordinating halide influences the photophysical properties of the Pt(II) complex in both the solid and solution states." @default.
• W3204335013 created "2021-10-11" @default.
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• W3204335013 date "2021-09-28" @default.
• W3204335013 modified "2023-10-18" @default.
• W3204335013 title "Halide Replacement Effect on Proton Conductivity and Vapochromic Luminescence of Pt(II) Complexes" @default.
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• W3204335013 doi "https://doi.org/10.1246/bcsj.20210279" @default.
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