Chiroptical detection of a model ruthenium dye in water by circularly polarized-electrochemiluminescence

Abstract

We demonstrate the possibility to detect selectively the two single enantiomers of a model [Ru(bpy)3]2+-based dye by circularly polarized-electrochemiluminescence (CP-ECL).

Circularly Polarized Luminescence of Cyclometalated Platinum(II) Complex Excimers: Large Difference between Isomers

“…7−9 Recently, the number of reports on the CPL of transition metal complexes has been rapidly increasing; therefore, knowledge regarding the CPL of these complexes has accumulated. 10−17 In general, the metal-to-ligand charge transfer (MLCT) transitions of iridium(III) 18,19 and ruthenium(II) 9,20 complexes give small g lum values, while their d−d transitions with small transition probabilities may give large g lum values. 7,13 Many papers studying the CPL spectra of organic and inorganic materials have been published from many laboratories.…”

“…Since the 1970s, in the field of inorganic chemistry, chiral rare-earth complexes have often been employed as promising CPL-active materials. , Rare-earth complexes, especially europium complexes, have been reported to give significant CPL signals with very large dissymmetry factors, g lum , above unity . In contrast, only a few CPL studies on transition metal complexes were published in the last century. − Recently, the number of reports on the CPL of transition metal complexes has been rapidly increasing; therefore, knowledge regarding the CPL of these complexes has accumulated. − In general, the metal-to-ligand charge transfer (MLCT) transitions of iridium­(III) , and ruthenium­(II) , complexes give small g lum values, while their d–d transitions with small transition probabilities may give large g lum values. , …”

Efficient 1400–1600 nm Circularly Polarized Luminescence from a Tuned Chiral Erbium Complex

“…Numerous CPL‐active materials have been prepared, giving rise to sizeable polarization [1] . This, in turn, is opening the way to various applications of CPL emitters in circularly polarized (CP) OLEDs, [2] CP microscopy, [3] security inks, [4] as well as in the field of CP electrochemiluminescence [5, 6] . Thanks to their peculiar photo‐physics and the possibility to attain extremely high degrees of circular polarization, chiral lanthanide complexes are at the forefront in the field of CPL [1, 3, 7–14] …”

“…[1] This, in turn, is opening the way to various applications of CPL emitters in circularly polarized (CP) OLEDs, [2] CP microscopy, [3] security inks, [4] as well as in the field of CP electrochemiluminescence. [5,6] Thanks to their peculiar photo-physics and the possibility to attain extremely high degrees of circular polarization, chiral lanthanide complexes are at the forefront in the field of CPL. [1,3,[7][8][9][10][11][12][13][14] Despite the significant surge in CPL reports, most examples remain confined in the visible region.…”

Recent Advances of Chiral Isolated and Small Organic Molecules: Structure and Properties for Circularly Polarized Luminescence

“…In 2020, the Sojic group [178] reported on the CPL and electrochemiluminescence (ECL) activity of enantiomers Δ/Λ-[Ru(dmbpy) 3 ] 2 + (Figure 7-11). The g EL values of Δ/Λ-[Ru-(dmbpy 3 ] 2 + are similar to g lum , both being À 7×10 À 4 and 7×10 À 4 .…”