Band gap engineering in fluorescent conjugated microporous polymers

Abstract

We report here the synthesis of conjugated microporous polymers (CMPs) based on pyrene building units. The networks are both microporous and highly luminescent. The emission colour and resulting band gap can be fine tuned by introducing different comonomers and by varying the monomer distribution (statistical versus alternating). These materials might find applications in organic electronics, photocatalysis, optoelectronics, or in sensing technologies.

Unprecedented high-temperature CO2 selectivity in N2-phobic nanoporous covalent organic polymers

“…The formation of azo-COPs was revealed by Fourier transform infrared spectroscopy (FTIR), elemental analysis, cross-polarization magic-angle spinning (CP/ MAS) 13 C NMR and ultraviolet-visible spectroscopies (Supplementary Figs S1-S3). The characteristic stretching band for -N ¼ N-functionality in the FTIR spectrum is clearly visible at 1,447 and 1,403 cm À 1 along with the respective bands for aromatic rings 33 .…”

“…N anoporous polymers [1][2][3][4][5][6] (pore width 1-100 nm) show considerable promise in gas capture 7 , storage 8 and separation technologies 9 , and as nano-filtration membranes 3 , catalysts 10 , drug delivery vehicles 11 and charge carriers 12,13 . These mostly organic polymers can easily be designed and constructed via facile synthetic protocols.…”

Trends and challenges for microporous polymers

“…4,39,88 Indeed, one of the prerequisites for polymer networks to achieve high surface areas is a rigid backbone, direct coupling of aromatic moieties is a common method for generation of microporous polymers. Without counting exactly it can be estimated that the number of conjugated microporous polymers (CMPs) far exceeds the ones which are not conjugated.…”

“…4). 88 The p-conjugated structure renders such aromatic networks potential organic semiconductors. Such an extended p-conjugation is rarely found in MOFs and then only when the integrated metal allows an electronic interaction from linker to linker.…”

Synthetic Control and Multifunctional Properties of Fluorescent Covalent Triazine-Based Frameworks

“…[ 8 ] CMP networks are mostly synthesized by the well-established transition metal catalyzed polycondensation reactions, such as the Sonogashira reaction, [ 9 ] Suzuki reaction, [ 10 ] and Yamamoto reaction. [ 11 ] In these polymerizations, however, deliberately made multifunctional monomers and expensive noble metal-based catalysts such as Pd(PPh 3 ) 4 or Ni(cod) 2 are normally utilized, which causes economic and purity problems. From the low-cost point of view, it is highly desirable to use earth-abundant metal or even metal-free catalysts to synthesize CMPs.…”