Cyclometalated iridium(iii) complex of a 1,2,3-triazole-based ligand for highly selective sensing of pyrophosphate ion

Abstract

A new cyclometalated Ir(III) complex of methylene bridged benzimidazole substituted 1,2,3-triazole methanol ligand has been synthesized for the photoluminescent detection of pyrophosphate (H2P2O72-) anion. The solution structure of 1[PF6] was...

An aggregation induced emission active bis-heteroleptic ruthenium(ii) complex for luminescence light-up detection of pyrophosphate ions

“…12b). Thus, like our recently reported highly selective ppi probe 25 in complex 1, only longchain anions such as PPi interact with the L1 ligand. The 1 H NMR titration result indicates that the long pyrophosphate ion is well-fitted in the middle of two amino ethanol arms of the L1 ligand of 1[PF 6 ] 2 through H-bonding interactions, making complex 1 a highly selective PPi sensor (Fig.…”

“…Like our previous report, herein, it is assumed that PPi perfectly fits between two aminoethanol arms of L1 ligand, and the H-bonding interaction with PPi increases the rigidity of the amino ethanol substituted phenanthroline ligand L1 in 1[PF 6 ] 2 . 24,25,60,74 As a consequence, nonradiative decay from the 3 MLCT excited state is inhibited, and PL is enhanced. It is further assumed that the energy gap between the 3 MLCT-3 MC excited state in complex 1 is significantly increased due to the formation of the 1•PPi adduct, which is also a reason for PL enhancement.…”

“…18 In this regard, pyrophosphate (PPi) detection and discrimination have received the utmost attention of several research groups. 19–25 Among the several reported methods, fluorescence sensing is advantageous over others owing to its high sensitivity and selectivity, low cost, signal simplification, and real-time detection, which offers application not only for in vitro assays but also for in vivo imaging studies. 26–29…”

“…18 In this regard, pyrophosphate (PPi) detection and discrimination have received the utmost attention of several research groups. [19][20][21][22][23][24][25] Among the several reported methods, fluorescence sensing is advantageous over others owing to its high sensitivity and selectivity, low cost, signal simplification, and real-time detection, which offers application not only for in vitro assays but also for in vivo imaging studies. [26][27][28][29] In recent years, the construction of light-emitting functional architectures by molecular self-assembly has been an attractive scientific research theme in chemistry, biology, and materials science because of their potential applications in various research areas such as molecular sensors, bioimaging probes, organic light-emitting diodes (OLEDs) and photocatalysis.…”

Development and Application of Ruthenium(II) and Iridium(III) Based Complexes for Anion Sensing

“…Again, PL-based detection of pyrophosphate via an iridium complex consisting of a new benzimidazole-substituted 1,2,3-triazole methanol ligand has been reported by Khatua and their group [ 142 ]. A three-fold increase in PL spectra of 137 ( Figure 19 ) upon pyrophosphate titration was observed, and the subsequent binding constant of 8.6 × 10 7 M −1 was calculated.…”