Catalase of Neurospora crassa. 2. Electron paramagnetic resonance and chemical properties of the prosthetic group

Biochemistry ◽  
1979 ◽  
Vol 18 (14) ◽  
pp. 2975-2980 ◽  
Author(s):  
Gary S. Jacob ◽  
W. H. Orme-Johnson
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Neurospora Crassa ◽  
Chemical Properties ◽  
Prosthetic Group ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
And Chemical Properties

scholarly journals Theoretical studies of the EPR parameters and local structure for the trigonal Yb3+ center in YAl3(BO3)4 crystal

2018 ◽  
Vol 65 (1) ◽  
pp. 1
Author(s):  
Hui-Ning Dong ◽  
Rong Zhang
Keyword(s):  
Chemical Properties ◽  
Defect Structures ◽  
Paramagnetic Resonance ◽  
Yttrium Aluminium ◽  
Epr Parameters ◽  
Structure Constants ◽  
Crystal Field Parameters ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

Yttrium aluminium borate crystals have excellent physical and chemical properties. In this paper, the electron paramagnetic resonance (EPR) g factors g//, g^ of Yb3+ and hyperfine structure constants A//, A^ of 171Yb3+ and 173Yb3+ isotopes in YAl3(BO3)4 crystal are calculated from the perturbation formulas. The crystal field parameters are obtained from the superposition model and the crystal structure data. The EPR parameters for trigonal Yb3+ centers in YAl3(BO3)4 are reasonably explained by considering the defect structures of doped Yb3+ centers. In the calculation, we also find that Yb3+ ion does not exactly reside in Y3+ site, but suffers an angle distortion  Dq (≈ 3.98 Å) with C3 axis. The results are discussed.

scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

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