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- W2063709422 abstract "A series of polyaryleneethynylene π-conjugated polymers that contain fac-(5,5′-diethynyl-2,2′-bipyridine)ReI(CO)3Cl as part of the π-conjugated polymer backbone have been synthesized by Pd-mediated coupling chemistry. Three metal-organic polymers P10, P25 and P50, have been prepared which contain, respectively, 10, 25 and 50 mol.% of the Re(I) repeat units in the polymer chain. These polymers have been characterized by 1H- and 13C-NMR and FTIR spectroscopy and gel permeation chromatography. The analysis indicate that the pholymers contain the intact Re(I) chromophore and Mn values of 10–15 kDa are typical (GPC, relative to polystyrene). The metal-organic polymers feature two spectrally-distinct absorption bands, one due to the π, π∗ absorption of the polymer backbone and another at lower energy which is attributed to the dπ(Re)→πpoly∗ metal to ligand charge transfer (MLCT) absorption. The luminescence properties of the polymers have been examined in fluid solution at 298 K and in a 2-methyltetrahedrofuran (MTHF) solvent glass at 77 K. These spectroscopic studies reveal that: (1) fluorescence from the 1π, π∗ exciton state is observed at 2.80 eV in all of the polymers at 298 and 77 K, but the intensity and lifetime of the fluorescence is quenched as the mole fraction of Re in the polymers increases; (2) phosphorescence from the 3π, π∗ state of the conjugated polymer backbone is observed at 1.93 eV in P10–P50 at 77 K; (3) luminescence from the dπ→π∗ MLCT state is observed at 1.8 eV in the metal-organic polymers at 77 K." @default.
- W2063709422 created "2016-06-24" @default.
- W2063709422 creator A5057556972 @default.
- W2063709422 creator A5060179495 @default.
- W2063709422 date "1998-04-01" @default.
- W2063709422 modified "2023-10-16" @default.
- W2063709422 title "Photophysics of metal-organic π-conjugated polymers" @default.
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- W2063709422 doi "https://doi.org/10.1016/s0010-8545(98)90043-1" @default.
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