Synthesis, characterization and fluorescence quenching of conjugated polymer containing triphenylamine group

Abstract

Poly(triphenylamine-p-phenylenevinylene)s with two different end-groups were obtained through a Wittig polycondensation. The structures of two copolymers were characterized. Ultraviolet and visible spectroscopy (UV-Vis) and photoluminescence (PL) spectra show the end-capped polymer emits intensive green light in both solution and film state. Their applications in the detection of nitro compounds were investigated, and the results show high fluorescence quenching sensitivity of the end-capped polymer towards o-nitrotoluene (o-NT). When the concentration of o-NT was 21.5 6 10 23 mol/L, the fluorescence quenching reached 96%. Additionally, after the exposure of polymer film in three different quenchers such as dinitrotoluene (DNT), p-nitrobenzoquinone (p-BQ) and p-nitrotoluene (p-NT) for 600 s, its fluorescence quenching reached 93.6%, 11.5% and 77.9%, respectively. This kind of polymer has great advantages in preparation and may find applications in the detection of nitro explosives.

Solid-state electropolymerization and doping of triphenylamine as a route for electroactive thin films

“…In the case of TPA, significant differences can be noticed for low scan rates. In agreement with reports on conjugated polymers bearing triphenylamine moieties either in solution 36 or as thin films, [36][37][38][39] this band can be assigned to p-p* transitions resulting from the conjugation between the aromatic rings and nitrogen atoms in the backbone structure of the polymer in its neutral form. When 50 cycles are applied at 5 or 10 mV s À1 , the last cycles lead to a dramatic drop in the currents for all the peaks, which seems to be associated to polymer degradation.…”

“…4b). In agreement with reports on conjugated polymers bearing triphenylamine moieties either in solution 36 or as thin films, [36][37][38][39] this band can be assigned to p-p* transitions resulting from the conjugation between the aromatic rings and nitrogen atoms in the backbone structure of the polymer in its neutral form. Thus, the idea of solid-state polymerization of TPA is supported.…”

Light‐Insensitive Organic Field‐Effect Transistors with n‐Type Conjugated Polymers Containing Dinitrothiophene Units

“…. Of various polar groups, nitro groups have been reported to efficiently quench fluorescence because of highly polarized nitrogen–oxygen atoms leading to strong electron‐withdrawing characteristics …”