Structural snapshots of the rearrangement of the bis(di-tert-butyl-aminophenyl)amine pincer ligand in the presence of transition metal ions

2018 ◽  
Vol 47 (33) ◽  
pp. 11303-11307 ◽  
Author(s):  
N. Leconte ◽  
B. Baptiste ◽  
C. Philouze ◽  
F. Thomas
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Pincer Ligand ◽  
Tert Butyl ◽  
Redox Active ◽  
Active Transition

The ligand undergoes N–N and C–N bond formations in the presence of redox-active transition metal ions, in air and coordinating solvents.

Low-density lipoprotein modification by normal, myeloperoxidase-deficient and NADPH oxidase-deficient granulocytes and the impact of redox active transition metal ions

Redox Report ◽  
2002 ◽  
Vol 7 (2) ◽  
pp. 111-119 ◽  
Author(s):  
Claudia E. Gerber ◽  
Gernot Bruchelt ◽  
Gerhard Ledinski ◽  
Joachim Greilberger ◽  
Dietrich Niethammer ◽  
...  
Keyword(s):  
Transition Metal ◽  
Nadph Oxidase ◽  
Metal Ions ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Transition Metal Ions ◽  
Low Density ◽  
Redox Active ◽  
Active Transition ◽  
The Impact

scholarly journals Redox Active Transition Metal ions Make Melanin Susceptible to Chemical Degradation Induced by Organic Peroxide

2017 ◽  
Vol 75 (3-4) ◽  
pp. 319-333 ◽  
Author(s):  
Andrzej Zadlo ◽  
Anna Pilat ◽  
Michal Sarna ◽  
Anna Pawlak ◽  
Tadeusz Sarna
Keyword(s):  
Retinal Pigment Epithelium ◽  
Transition Metal ◽  
Metal Ions ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Transition Metal Ions ◽  
Chemical Degradation ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Tert Butyl Hydroperoxide

Abstract With aging, retinal pigment epithelium melanosomes, by fusion with the age pigment lipofuscin, form complex granules called melanolipofuscin. Lipofuscin granules may contain oxidized proteins and lipid hydroperoxides, which in melanolipofuscin could chemically modify melanin polymer, while transition metal ions present in melanin can accelerate such oxidative modifications. The aim of this research was to examine the effect of selected transition metal ions on melanin susceptibility to chemical modification induced by the water-soluble tert-butyl hydroperoxide used as an oxidizing agent. Synthetic melanin obtained by DOPA autooxidation and melanosomes isolated from bovine retinal pigment epithelium were analyzed. To monitor tert-butyl hydroperoxide-induced oxidative changes of DMa and BMs, electron paramagnetic resonance spectroscopy, UV-vis absorption spectroscopy, dynamic light scattering, atomic force microscopy and electron paramagnetic resonance oximetry were employed. These measurements revealed that both copper and iron ions accelerated chemical degradation induced by tert-butyl hydroperoxide, while zinc ions had no effect. Strong prooxidant action was detected only in the case of melanosomes and melanin degraded in the presence of iron. It can be postulated that similar chemical processes, if they occur in situ in melanolipofuscin granules of the human retinal pigment epithelium, would modify antioxidant properties of melanin and its reactivity.

Surface Modification of Nanoclays by Catalytically Active Transition Metal Ions

Langmuir ◽  
2007 ◽  
Vol 23 (19) ◽  
pp. 9808-9815 ◽  
Author(s):  
Pranav Nawani ◽  
Mikhail Y. Gelfer ◽  
Benjamin S. Hsiao ◽  
Anatoly Frenkel ◽  
Jeffrey W. Gilman ◽  
...  
Keyword(s):  
Surface Modification ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Catalytically Active ◽  
Active Transition
Sign in / Sign up

Export Citation Format

Share Document