By William T. Coffey
Russian members supply a synthesis of rules drawn from dielectric, magnetic and elastic leisure. Divided into 3 sections, the e-book commences with dielectric and comparable procedures in easy beverages. half bargains with the constitution and dielectric leisure of aqueous recommendations. finally, it addresses magnetic and dielectric leisure in liquid crystals and elastic leisure in orientable polymers.
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T. 42 Synthesis of a phosphonated poly(phenylene ethynylene) (P110). 43 Synthesis of a cationic poly(phenylene ethynylene) (P111). 1 Cationic Poly(ﬂuorene ethynylene)s A series of cationic poly(ﬂuorene ethynylene)s were reported in 2007 to study solvent-induced self-assembly [64, 65]. 46. The neutral poly(ﬂuorene ethynylene)s were prepared by heating p- and m-diiodobenzene with 2,7-diethynyl-9,9-bis[6 -(N,N-diethyl)hexyl]ﬂuorene (96) using Pd(PPh3 )4 /CuI as the catalyst. Treatment of neutral poly(ﬂuorene ethynylene)s with iodomethane in THF/DMF mixture afforded P119–P122 with 70–80% degree of quaternization.
17. Under basic condition, 2,7-dibromoﬂuorene (35) was reacted with 1,6-dibromohexane to afford 2,7-dibromo-9,9-bis(6-bromohexyl)ﬂuorene (36). Treatment of 36 with dimethylamine (Me2 NH) in THF led to 37. The Suzuki polymerization between 37 and 1,4-phenyldiboronic acid gave the neutral polymer P46, which on treatment with iodomethane yielded P47. 18). 17 Synthesis of a cationic polyﬂuorene (P47). mixture in the presence of excess NaOH. The Suzuki copolymerization between 38 and different diboronate monomers followed by treatment with bromoethane led to blue-ﬂuorescent alternating polyﬂuorenes (P48 and P49).
3 Zwitterionic Poly(ﬂuorene)s As compared to cationic and anionic polyﬂuorenes, zwitterionic polyﬂuorenes have been less developed. However, they have been found useful as electron-transporting/injecting materials in organic light-emitting diodes (OLEDs) [49, 50]. 34). The Suzuki polymerization between 2,7-dibromo-9,9-bis((N,N-dimethylamino)ethyl)ﬂuorene (69) and 2,7-bis-(1,3,2-dioxaborolan-2-yl)-9,9-dioctylﬂuorene led to the neutral polymer P86 with terminal tertiary amine. Quaternization of P86 with 1,4-butane sultone in THF/methanol mixture yielded P87, which was soluble in methanol and DMSO.