Gas Response Behaviour and Photochemistry of Borondiketonate in Acrylic Polymer Matrices for Sensing Applications

Abstract

The fluorescent spectra in combination with gas response behavior of acrylic polymers doped with dibenzoyl(methanato)boron difluoride (DBMBF2) were studied by fluorescence spectroscopy and time-resolved fluorescence lifetime. The role of acrylic matrix polarity upon the fluorescence spectra and fluorescence lifetime was analyzed. Changes in emission of the dye doped polymers under exposure to toluene, n-hexane and ethanol were monitored. The fluorescence lifetimes were measured for the singlet excited state as well as the exciplex formed between DBMBF2 and toluene. A reduction of the transition energy to the first singlet-excited state in the four polymers was observed, compared to solution. Reversible exciplex formation, viz. a red shifted fluorescence emission was perceived when exposing the polymers to toluene, while for hexane and ethanol only reversible reduction of the fluorescence occurred. Longer singlet and shorter exciplex lifetimes were observed for non-polar matrixes. The latter mechanism is explained in function of the lower charge transfer character of the exciplex in non-polar matrixes. Additionally, the quantum yield of the dye in the polymer matrix increased almost seventh-fold compared to values for solution.

Novel DBMBF2-BODIPY dyads connectedviaa flexible linker: synthesis and photophysical properties

“…61 One of the most promising applications of DBMBF 2 derivatives is the detection of trace amounts of vapours of benzene, toluene, and xylenes (BTX). [61][62][63][64][65][66][67][68][69][70][71][72] Despite the fact that DBMBF 2 derivatives have been well studied to date, there is almost no data on the use of these chromophores in RET systems, with the exception of a few ref. 73.…”

Люминесенция Полимерной Композиции, Допированной Хелатами Бора. Механизм Сенсибилизации Люминесценции

“…Люминесценция эксимеров отличается значительным батохромным смещением спектра лю-минесценции относительно спектра поглощения люми-нофора, что позволяет уменьшить потери энергии в результате самопоглощения. Возможно также образова-ние эксиплексов в результате взаимодействия молекул люминофора с ароматическими группами соседних мо-лекул [6]. Как показано в [3], изменяя концентрацию раствора β-дикетонатов дифторида бора можно управ-лять цветом люминесценции.…”

High-contrast mechanochromism and polymorphism-dependent fluorescence of difluoroboron β-diketonate complexes based on the effects of AIEE and halogen

“…The synthesis and application of them are a highly relevant topic owing to their unique characteristics. A series of b-diketone boron complexes with MFC behaviors was successively reported by Fraser et al [47][48][49][50] More importantly, several AIEactive luminogens including diuoroboron complexes exhibit multicolor switching. [51][52][53][54][55][56] Considering the charming luminescent performance of b-diketonate complexes (DFD), propeller-like conformations of TPE and the unique effect of halogen, herein, three luminogens (2a, 2b and 2c) were designed and synthesized by conjugating TPE with DFD or halogen-substituted DFD.…”