Toward a Highly Sensitive Fluorescence Sensing System of an Amphiphilic Molecular Rod: Facile Synthesis and Significant Solvent-Assisted Photophysical Tunability

Abstract

A conjugated polyelectrolyte with symmetrically assembled hydrophilic and hydrophobic side groups along the backbone has been successfully synthesized and demonstrated significant photophysical tunability with 65 nm of wavelength shift and 10-fold of intensity enhancement for the emission maximum, through solvent composition adjustment. The highest fluorescence quenching effect (I/I 0 = 148) toward 10 μM of Fe 3þ was achieved in the solution having a THF/H 2 O ratio of 30/70, which could be attributed to a delicate balance among the influencing factors for the fluorescence quenching systems, the initial fluorescence, the rate of energy migration, and the accessibility of the receptors. The amplified symmetrical aggregation-nonaggregation inversion and the asymmetrical cation sensitivity across the whole range of H 2 O/THF composition were consistent with the molecular design.

One‐step synthesis of a thienylenepyridazinylenethienylene‐based coil‐rod‐coil copolymer with enhanced emission and improved fluorescence stability

“…The absorption and emission should come from the p-p* electronic transition along the conjugated polymer backbone and the coexistence of the emission peak and shoulder can be attributed to the existence of the vibrational structure of the polymers. 49,50 In both absorption and emission spectra, slight blue-shifting was found for PEG-OEPETPT-PEG compared to PEPETPT, which is consistent with the fact that PEG-OEPETPT-PEG has a shorter conjugated segment. In addition, the tri-block copolymer was found to have a higher quantum yield of fluorescence than PEPETPT.…”

“…Both polymers have an emission shoulder, which was about 35 nm away from the peak at a longer wavelength. The absorption and emission should come from the π‐π* electronic transition along the conjugated polymer backbone and the coexistence of the emission peak and shoulder can be attributed to the existence of the vibrational structure of the polymers 49, 50…”

Poly(perylene‐alt‐phenyleneethynylene)s with multiple pendant ester groups in various lengths: Synthesis, photophysics and selective hydrolysis

“…Design and synthesis of fluorescent polymers with various chemical structures may lead to new properties and broaden their applications. Sonogashira coupling is a powerful tool for synthesis of poly(aryleneethynylene)s with various combinations of conjugated backbones and pendant groups, starting with bisalkyne and dihaloarene monomers . Perylene is a well known and commercially available dye with five conjugated aromatic rings .…”

Amplified Detection of Iron Ion Based on Plasmon Enhanced Fluorescence and Subsequently Fluorescence Quenching

“…During the past couple of decades, fluorescence detection offers a promising approach for simple and rapid tracking of heavy metal ions [ 13 , 14 ]. Contamination of water by metal ions ( e.g.…”