Synthesis and characterization of a new alternating copolymer containing quaterphenyl and fluorenyl groups |
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Affiliation: | 1. Departamento de Engenharia Metalúrgica e de Materiais, Escola Politécnica, Universidade de São Paulo, Av. Prof. Mello Moraes 2463, 05508-900 São Paulo, SP, Brazil;2. LPMN, Institut des Matériaux Jean Rouxel, 2 Rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France |
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Abstract: | An alternating copolymer was synthesized by Suzuki reaction from 4,4′-dibromo-p-quaterphenyl (PPP oligomer) and 9,9-dioctylfluorene-2,7-diboronic acid in good yield (84%). The copolymer is partially crystalline, readily soluble in organic solvents, presents high fluorescence quantum yield (85.6%) and high thermal stability. The copolymer absorption as well as the emission spectra are red shifted compared to those of monomers. Ultrafast time-resolved fluorescence experiments on the copolymer were carried out and confirmed the results obtained from stationary experiments. The copolymer fluorescence decay is found to be bi-exponential with fluorescence lifetimes of 297 ± 6 ps and 942 ± 5 ps. |
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