Photoluminescence and ion sensing properties of a bipyridyl chromophore-modified semifluorinated polymer and its metallopolymer derivatives

Enhanced Fluorescence Detection of Metal Ions Using Light‐Harvesting Mesoporous Organosilica

“…Red shifts similar to that observed for Zn [24, 25] Eu 3 + gave almost no change in the fluorescence spectrum because of its weak binding to the 2,2'-bipyridyl unit in the presence of methanol. [31] The dependence of the spectral change of the fluorescence on the metal ions was similar to that observed for the BPy-derivative molecule [24] and BPy-modified polymer [25] reported by Smiths group. They reported a 44 nm red shift of the emission upon the addition of divalent d 10 metal ions of Zn 2 + , Hg 2 + , and Cd 2 + , accompanied by an increase in the emission intensity when the new absorption band was excited at 420 nm.…”

“…(Figure 8 b) also showed a decrease in the absorption band at around 350 nm, with the concomitant formation of a new red-shifted absorption band at around 400 nm through an isosbestic point at 375 nm. A similar systematic change in the spectra was observed for homogeneous solution systems with dissolved BPy-containing molecules [24] and polymers [25] upon the addition of Zn 2 + . The spectral red shift is understood as an enhanced planarity of the BPy unit and the resulting change in the electron density upon 1:1 metal complexation, as shown in Figure 8 [24b] To the best of our knowledge, this is the first example of a systematic spectral change of BPy ligands attached onto the surface of a solid material upon the titration of metal ions.…”

“…Preparations of PMO with bipyridine receptor: The BPy moiety was selected as a receptor because it has typically been used as a strong ligand for transition metal ions, and has been incorporated in various molecular [24] and polymer [25] chemosensors for the detection of metal ions. A fluorescent receptor containing the BPy ligand 1 was newly designed.…”

Facile method towards functionalization of partially fluorinated polyarylethers via sequential post-polymerization modification

“…Functionalized fluoropolymers would be of interest because they would combine the aforementioned merits of fluorinated materials for specific applications [4]. Such tailored fluoropolymers, specifically PFCB aryl ethers, have been involved in various applications including thermally crosslinkable additives [5], proton exchange members (PEMs) for fuel cells [6,7], chemical sensors [8,9], polymer light emitting diodes (PLEDs) [10], gas separation membranes [11], and electro-optical (EO) materials [12,13].…”

A novel strategy for chromogenic chemosensors highly selective toward cyanide based on its reaction with 4-(2,4-dinitrobenzylideneamino)benzenes or 2,4-dinitrostilbenes

“…In this regard, CN À represents an important target analyte to be detected due to its many industrial applications and considering the risk that it poses to human health, being lethal in very small amounts because it inhibits the mitochondrial electron transport chain due to its strong binding to the active site of cytochrome-oxidase [18][19][20]. Some roots and fruit seeds release CN À through hydrolysis [21] and also some neurotoxic agents [22][23][24] deliver CN À through hydrolysis [25], highlighting the importance of the development of optical chemosensors for CN À detection [26][27][28][29]. http Many strategies have been used to detect CN À , these being generally based on acid-base equilibrium [11,[30][31][32][33], the formation of cyanide complexes [34][35][36][37][38][39] and the development of chemodosimeters, which are systems able to interact with the anion through irreversible reactions [11,13,[40][41][42].…”