Bis-cyclometallated Ir(<scp>iii</scp>) complexes containing 2-(1<i>H</i>-pyrazol-3-yl)pyridine ligands; influence of substituents and cyclometallating ligands on response to changes in pH

Abdolla, Noreldin S. Y.; Davies, David; Lowe, Mark P.; Singh, Kuldip

doi:10.1039/d0dt02434a

Cited by 3 publications

(3 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, as result of the NH pyrazolyl deprotonation, pyrazole protons H(24) and H(25) shifted upfield from 6.98 and 7.86 ppm in 2 to 6.37 and 7.21 ppm in 1 respectively, which is consistent with similar complexes reported by Davis and coworkers. 17 Moreover, 13 C-NMR spectra followed the same trend displaying the asymmetric pattern for 1 and 2 , Fig. S4 and S7 †.…”

Section: Resultsmentioning

confidence: 56%

See 1 more Smart Citation

Synthetic ease and exceptional in vivo performance of pyrazole-based cyclometallated iridium complexes

Redrado,

Romanos,

Benedi

et al. 2024

Inorg. Chem. Front.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 56%

“…S10 †. Notably, the 30 nm red shift is much greater than that observed for analogue complexes (Δ λ = 12 nm) 17 in cases where C^N ppy instead of mpc. This suggests that compounds 1 and 2 could be promising candidates for pH sensors.…”

Section: Resultsmentioning

confidence: 85%

Synthetic ease and exceptional in vivo performance of pyrazole-based cyclometallated iridium complexes

Redrado,

Romanos,

Benedi

et al. 2024

Inorg. Chem. Front.

View full text Add to dashboard Cite

show abstract

“…In the past two to three decades, phosphorescent iridium(III) complexes have become research hotspots [1–11] in the field of photoluminescence and electroluminescence because of their high luminous efficiency, stable structures, appropriate emission lifetime and tunable emitting color. Previous studies have shown that choice of ligand is crucial for optimizing emission wavelength, phosphorescence lifetime, luminescence efficiency and excited state characters of iridium(III) complexes [12–22] . To a large degree, the photophysical properties of complexes are affected by special functional groups, spatial configuration and strong electron‐withdrawing/donating abilities of the ligands.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Bridged Triphenylamine Units Tuning the Photophysical Properties of Classical Phosphorescent Iridium(III) Complex

Cao

Song

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

A new yellow phosphorescent iridium(III) complex Ir(ppybop)2acac with two oxygen‐bridged triphenylamine units were prepared and investigated. The cyclometalating ligand ppybop was synthesized by the efficient Suzuki‐Miyaura cross‐coupling reaction of oxygen‐bridged triarylamine unit based boron reagent 1‐a and 2‐(4‐Bromophenyl)pyridine, and the acetylacetone (acac) was used as an auxiliary ligand. Notably, the complex Ir(ppybop)2acac measured with a fluorescence spectrophotometer can show a larger redshift emission (λem=568 nm), a narrower full width at half maximum (FWHM=59 nm), a longer emission lifetime (τ[b]=3127 ns) and a better solubility in comparison with the classical green complex Ir(ppy)2acac (λem=520 nm, FWHM=70 nm, τ[b]=1206 ns). In addition, the DFT calculation results indicate that the strong electron‐donating ability of the unit can lead to the unusual ligand‐to‐metal charge transfer (3LMCT) excited state characteristics of Ir(ppybop)2acac, which is completely different from the metal‐to‐ligand charge transfer (3MLCT) in Ir(ppy)2acac. This result can provide a new strategy for the design of new phosphorescent iridium(III) complexes.

show abstract

pH Colorimetric Sensor Arrays: Role of the Color Space Adopted for the Calculation of the Prediction Error

Pastore

Badocco

Bogialli

et al. 2020

Sensors

View full text Add to dashboard Cite

A pH colorimetric sensor array was prepared and characterized by combining tetrabromophenol blue (TBB) and bromothymol blue (BB) embedded in organically modified silicate (OrMoSil) spots polyvinylidene fluoride (PVDF)-supported. The signal was based on the Hue profile (H). The individual calibrations of TBB and BB showed precisions with minimum values of 0.012 pH units at pH = 2.196 for TBB and 0.018 at pH = 6.692 for BB. The overall precision of 10 spots of the mixture TBB/BB increased in the pH range of 1.000–8.000 from a minimum value of pH precision of 0.009 at pH = 2.196 to 0.012 at pH = 6.692, with the worst value of 0.279 pH units at pH = 4.101. The possibility to produce an array with much more than 10 spots allows for improving precision. The H analytical performance was compared to those of other color spaces such as RGB, Lab, and XYZ. H was the best one, with prediction error in the range of 0.016 to 0.021 pH units, at least three times lower than the second-best (x coordinate), with 0.064 pH units. These results were also confirmed by the calculation of the main experimental contributions to the pH prediction error, demonstrating the consistency of the proposed calculation approach.

show abstract

Bis-cyclometallated Ir(iii) complexes containing 2-(1H-pyrazol-3-yl)pyridine ligands; influence of substituents and cyclometallating ligands on response to changes in pH

Abstract: Bis-cyclometallated Ir(III) complexes containing 2-(1H-pyrazol-3-yl)pyridine ligands have been synthesised. Their absorption is almost unchanged with changes in pH however the emission intensities vary by a factor of up to three...

Cited by 3 publications

References 62 publications

Synthetic ease and exceptional in vivo performance of pyrazole-based cyclometallated iridium complexes

Synthetic ease and exceptional in vivo performance of pyrazole-based cyclometallated iridium complexes

Oxygen‐Bridged Triphenylamine Units Tuning the Photophysical Properties of Classical Phosphorescent Iridium(III) Complex

pH Colorimetric Sensor Arrays: Role of the Color Space Adopted for the Calculation of the Prediction Error

Contact Info

Product

Resources

About