methylthymol blue
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2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zolaikha Rasouli ◽  
Mehdi Irani ◽  
Sonia Jafari ◽  
Raouf Ghavami

AbstractIn this study, we determine the acidity constants of methylthymol blue (MTB) and association constants of its complexes with the ZnII, CuII, and FeII metal ions (MIs), through theoretical and experimental means. The complexes were characterized using UV–Visible absorption spectroscopy combined with soft/hard chemometrics methods and quantum chemical calculations. Quantum chemical calculations revealed that electronic transitions in the UV–Visible spectra of MTB have mixed n → π* and π → π* characters. The results of molar ratio and multivariate curve resolution alternating least squares (MCR-ALS) revealed the formation of successive 1:2 and 1:1 complexes (MI:MTB) for the ZnII and CuII systems. However, the formation of successive 1:1 and 2:1 complexes are suggested for FeII by the molar ratio and MCR-ALS. The majority of transitions observed in the UV–Visible spectra of the Zn(MTB) and Cu(MTB) complexes have ligand-to-ligand charge transfer (LLCT) characters. However, the transitions in the UV–Visible spectrum of the Fe(MTB) complex have LLCT and metal-to-ligand charge transfer (MLCT) characters. For the Fe2(MTB) complex, the lowest energy transition of has an LLCT character. However, its higher energy transitions are a mixture of LLCT, MLCT, and metal-to-metal charge transfer (MMCT) characters. The correlation between experimental and computed wavelengths revealed that the 1:1 complexes of ZnII and CuII prefer square pyramidal geometries. However, the FeII complexes always show octahedral geometry.



2021 ◽  
Vol 141 ◽  
pp. 106540
Author(s):  
Khalid A. Rabaeh ◽  
Molham M. Eyadeh ◽  
Tariq F. Hailat ◽  
Balázs G. Madas ◽  
Feras M. Aldweri ◽  
...  


2020 ◽  
Vol 80 ◽  
pp. 47-56
Author(s):  
Wrya Parwaie ◽  
Ghazale Geraily ◽  
Alireza Shirazi ◽  
Ghazal Mehri-Kakavand ◽  
Mostafa Farzin


2020 ◽  
Vol 173 ◽  
pp. 108943 ◽  
Author(s):  
Wrya Parwaie ◽  
Ghazale Geraily ◽  
Alireza Shirazi ◽  
Ahmad Shakeri ◽  
Hassan Massumi ◽  
...  


The Analyst ◽  
2020 ◽  
Vol 145 (16) ◽  
pp. 5438-5449 ◽  
Author(s):  
Yang Zhao ◽  
Qiao-Jing Li ◽  
Yong-Sheng Li ◽  
Xiu-Feng Gao

Simultaneous and automatic quantification of peroxidase and ascorbic acid based on one reaction system and application of a carbon dot simulative enzyme.





2018 ◽  
Vol 118 ◽  
pp. 77-85 ◽  
Author(s):  
Molham M. Eyadeh ◽  
Khalid A. Rabaeh ◽  
Tariq F. Hailat ◽  
Mohammad Y. Al-Shorman ◽  
Feras M. Aldweri ◽  
...  


2018 ◽  
Vol 149 (9) ◽  
pp. 1653-1657
Author(s):  
Karel Nesměrák ◽  
Pavlína Třmínková-Němcová ◽  
Ladislav Drož ◽  
Jaroslav Goliáš ◽  
Petr Jedelský


2018 ◽  
Vol 148 ◽  
pp. 25-32 ◽  
Author(s):  
Khalid A. Rabaeh ◽  
Molham M. Eyadeh ◽  
Tariq F. Hailat ◽  
Feras M. Aldweri ◽  
Samer M. Alheet ◽  
...  


2018 ◽  
Vol 108 ◽  
pp. 26-33 ◽  
Author(s):  
Molham M. Eyadeh ◽  
Khalid A. Rabaeh ◽  
Tariq F. Hailat ◽  
Feras M. Aldweri


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