Synthesis of bright water-soluble circularly polarized luminescence emitters as potential sensors

Abstract

Complexes exhibiting strong circularly polarized luminescence in water were synthesized and used as CPL probes sensing pH and metal ions.

Asymmetric Ruthenium Catalysis Enables Fluorophores with Point Chirality Displaying CPL Properties**

“…[19] A hydride signal located at À 7.53 ppm (J PH = 31 Hz) of a cationic hydridoruthenium(IV) species arising from the protonation-anionation of the ruthenium(II) center by the sulfonic acid moiety was observed. [11g,20] Chelate formation was evidenced by the modification of the diastereotopic proton signals for the two CH 2 moieties of the sulfo-binepine ligand and by 31 P NMR (Figure S1). Interestingly, a broad signal located at no less than 25 ppm in 1 H NMR accounting for the ruthenium(II) precursor was also noticed (Scheme 1).…”

“…Interestingly, these chiral chromophores are CPL active in water (glum = 6.610 -4 ); small organic molecules that show CPL responses in water are scarce and could be considered as interesting building blocks for biologically relevant applications that require aqueous solubility. [29][30][31][32] On the other hand, CPL stimuli-responsive materials are of great interest due to their possible incorporation in security technologies and their potential application as smart CPL sensors. [33][34][35][36][37]…”

Fabrication of ballpoint-ink via encapsulating inorganic pigments in microemulsion gels

“…[2][3][4] Nowadays, indigo obtained from inorganic salts has not lost its importance because it offers better stability, especially oxidation resistance, compared with organic pigments. 5 However, research on the solubility of inorganic compounds might play an essential role to unlock the physical and chemical aspects of thermodynamics and kinetics of the molecules microscopically, hence this understanding may be helpful for future advanced research, such as in nanotechnology, [6][7][8] nanophotonics, 9 nanocoatings, 10 solar cell fabrication, 11 membrane therapy, 12 drug delivery to cancer cells, anti-counterfeiting material coatings, 13 optical sensors, 14 etc. In addition, the dissolution of inorganic pigments into microemulsions potentially has a bright future, as it can be applied in the pharmaceutical industry and in the conversion of light into energy, solar cells, sensor technology, and photonics.…”

Circularly polarized luminescence of encaged Eu(iii) and Tb(iii) complexes controlled by an inherently chiral remote unit

“…Various chiral structures like podands or macrocycles, 6 including pillar[ n ]arenes 7 or cyclophanes, 8 helicenes, 9 binaphthyl derivatives, 10 cubes, 11 porphyrin nanorings 12 or rotaxanes, 13 have been reported to show CPL properties. Recently, some of us reported the first investigation of the CPL activity of Eu 3+ and Sm 3+ cryptates, demonstrating that the encapsulation of the lanthanide ions in the cavity of a rigid chiral tris-bipyridyl based cryptand is indeed an efficient tool to obtain stable Ln 3+ complexes endowed with circularly polarized emission.…”