Abstract
The photophysical properties of conjugated microporous polymers (CMPs) are tuned using an acceptor doping strategy. This allows the fluorescence of a native polyphenylene network to be controlled by introducing low loadings (0.1–5 mol %) of an acceptor comonomer, such as benzothiadiazole (BT), bisthiophenebenzothiadiazole (TBT) and perylenediimide (PDI). Fluorescence quantum yields are around 10 times higher than analogous nonporous polymers because of avoidance of chain aggregation in the porous network. White emitting CMPs with high quantum yields are prepared using this approach. Different domain structures can be prepared by changing the addition sequence of the monomers, and this has a strong effect on the fluorescent properties. These doped porous polymers can also be used as fluorescence sensors for volatile organic compounds (VOCs).
Highlights
Since the discovery of the first conjugated microporous polymers (CMPs) in 2007,1 there has been much interest in the synthesis and possible uses of these materials.[2−6] CMPs have been studied for applications such as CO2 capture[7,8] and gas separation,[9,10] which do not take specific advantage of the conjugation in the networks
When a small amount (0.1−5 mol %) of dibromobenzo[c]-1,2,5-thiadiazole 3 (BT) was added to the measured in the solid state, and at 436 nm when measured as a reaction mixture, an insoluble green powder was obtained in all dispersion in polyethylene glycol 400 (PEG)
Similar trends were found for the photoluminescence of these BT copolymers; CP-CMP3a-f all showed a green fluorescence in the solid state centered at 506 nm for CP-CMP3a that was red-shifted to 524 nm for CP-CMP 3f (Figure 2)
Summary
Since the discovery of the first conjugated microporous polymers (CMPs) in 2007,1 there has been much interest in the synthesis and possible uses of these materials.[2−6] CMPs have been studied for applications such as CO2 capture[7,8] and gas separation,[9,10] which do not take specific advantage of the conjugation in the networks. This method is well-known in nonporous, linear conjugated polymers,[23−25] but has so far not been demonstrated for CMPs, where the monomer stacking is quite different as a result of the extensive porosity.[20]
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