Chiral self-sorted multifunctional supramolecular biocoordination polymers and their applications in sensors

Abstract

Chiral supramolecules have great potential for use in chiral recognition, sensing, and catalysis. Particularly, chiral supramolecular biocoordination polymers (SBCPs) provide a versatile platform for characterizing biorelated processes such as chirality transcription. Here, we selectively synthesize homochiral and heterochiral SBCPs, composed of chiral naphthalene diimide ligands and Zn ions, from enantiomeric and mixed R-ligands and S-ligands, respectively. Notably, we find that the chiral self-sorted SBCPs exhibit multifunctional properties, including photochromic, photoluminescent, photoconductive, and chemiresistive characteristics, thus can be used for various sensors. Specifically, these materials can be used for detecting hazardous amine materials due to the electron transfer from the amine to the SBCP surface and for enantioselectively sensing a chiral species naproxen due to the different binding energies with regard to their chirality. These results provide guidelines for the synthesis of chiral SBCPs and demonstrate their versatility and feasibility for use in various sensors covering photoactive, chemiresistive, and chiral sensors.

Energy-storage covalent organic frameworks: improving performance via engineering polysulfide chains on walls

“…The CN peak at 1624 cm –1 found in TFPPy–ETTA–COF and S@TFPPy–ETTA–COF disappeared in polysulfide@TFPPy–ETTA–COF (Fig. 4), because the ring-opening of elemental sulfur with the diradical formed at elevated temperatures undergoes radical insertion reactions with the CN linkages 16. The red shift of the CC stretching vibration at 1500 cm –1 and the decreased intensity of the (–N–)C–H vibration at 1169 cm –1 in polysulfide@TFPPy–ETTA–COF indicate the substitution of H in (–N–)C–H by S. The C–S bond was observed by stretching bands at 690 and 1062 cm –1 (Fig.…”

“…S4†) up to even 430 °C under evacuated conditions. Polysulfide@TFPPy–ETTA–COF (Scheme 1c and e) was prepared by heating sulfur at 300 °C with TFPPy–ETTA–COF in which the CN imine units triggered the polymerization of sulfur to form polysulfide chains that are anchored on the pore walls via C–S bonds 16. Melting sulfur at 155 °C with the COF yielded S@TFPPy–ETTA–COF (Scheme 1b and d) with S 8 loaded in the pores while the imine units are intact.…”

A One‐Pot Polymerization for Concurrently Inducing Predominant Helicity in Optically Inactive Helical Polymer and Constructing Graphene‐Based Chiral Hybrid Foams

“…Chiral helical polymers have attracted much interest due to their intriguing helical structures and chiral amplification effect . They demonstrate substantial potential applications in chiral‐related fields including asymmetric catalysis, chiral recognition/separation, enantio‐selective release, enantio‐selective crystallization, etc. As typical synthetic helical polymers, substituted polyacetylenes have been investigated the most intensively .…”

Recent Advances of Conducting Polymers and Their Composites for Electrochemical Biosensing Applications

“…The fabrication of chiral sensors is a promising field of research for electrochemists. A chiral supramolecular polymer consisting of alanine-based naphthalene diimides and Zn ions (AlaNDI-Zn) [66] exhibits multifunctional properties. Its photoconductive and chemo-resistive characteristics can be used in developing various sensors.…”