Site Selective Magneto-Optical Studies of Eu ions in Gallium Nitride

2011 ◽  
Vol 1342 ◽  
Author(s):  
Nathaniel Woodward ◽  
Atsushi Nishikawa ◽  
Yasufumi Fujiwara ◽  
Volkmar Dierolf
Keyword(s):  
Gallium Nitride ◽  
Magnetic Fields ◽  
Visible Light ◽  
Resonant Excitation ◽  
Optical Studies ◽  
G Value ◽  
Site Selective

ABSTRACTWe report site-selective studies of the Zeeman splittings that are observed for magnetic fields up to 6.6T for different Eu incorporation sites in GaN. Utilizing resonant excitation with visible light, we are able to distinguish the site and find for one center (Eu1) a splitting into five components as expected for C3v symmetry. The corresponding g-values are 1.66 and 1.90. The two lines of another center Eu2 each split into two levels corresponding to g-values of 1.9 and 2.84. Most surprisingly a third center, for which only one line is clearly identified, a g-value of 6.16 is found which is larger than can be explained for a 7F2 purely ionic Eu state.

Single-atom-nickel photocatalytic site-selective sulfonation of enamides to access amidosulfones

2021 ◽  
Vol 23 (7) ◽  
pp. 2756-2762
Author(s):  
Jianjing Yang ◽  
Zongzhao Sun ◽  
Kelu Yan ◽  
Haozhe Dong ◽  
Hongyan Dong ◽  
...  
Keyword(s):  
Visible Light ◽  
Single Atom ◽  
Site Selective

A single-atom photocatalyst Ni/TiO2 was developed for the visible-light-induced site-selective sulfonation of enamides to give amidosulfones with 36 examples up to 99% yield.

Site-selective phenol acylation mediated by thioacids via visible light photoredox catalysis

2018 ◽  
Vol 5 (8) ◽  
pp. 1312-1319 ◽  
Author(s):  
Lili Shi ◽  
Hongxin Liu ◽  
Luqiong Huo ◽  
Yaqian Dang ◽  
Yu Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Natural Product ◽  
Hydroxyl Group ◽  
Photoredox Catalysis ◽  
Phenolic Esters ◽  
Site Selective

Site-selective phenol acylation mediated by thioacids via photoredox catalysis is described. This protocol provided facile access to an array of phenolic esters with exclusive acylation priority of phenol hydroxyl group to alcoholic one. Its utility was also demonstrated by the modification of biologically meaningful natural product.

Nitroacenaphthene as a New Photocatalyst for the Synthesis of Sulfonyl Amidines

Synthesis ◽  
2019 ◽  
Vol 51 (23) ◽  
pp. 4425-4433
Author(s):  
Yong Jian ◽  
Ming Chen ◽  
Chao Yang ◽  
Wujiong Xia
Keyword(s):  
Visible Light ◽  
Small Molecule ◽  
Reaction Pathways ◽  
Visible Light Photocatalyst ◽  
Mild Conditions ◽  
Sulfonyl Azides ◽  
Site Selective ◽  
First Time

A small molecule, namely nitroacenaphthene, is reported for the first time as a recyclable visible-light photocatalyst for the construction of the C=N bond from sulfonyl azides and amines. This scalable, site-selective protocol provides a convenient way to access various sulfonyl amidines under mild conditions. Two reaction pathways are proposed, according to different transformation patterns.

Differential formation of nitrogen-centered radicals leading to unprecedented, regioselective bromination of N,N′-(1,2-phenylene)bisamides and 2-amidophenols

2020 ◽  
Vol 7 (9) ◽  
pp. 1095-1106
Author(s):  
Damoder Reddy Motati ◽  
Dilipkumar Uredi ◽  
Amarender Goud Burra ◽  
J. Phillip Bowen ◽  
Frank R. Fronczek ◽  
...  
Keyword(s):  
Visible Light ◽  
Highly Efficient ◽  
Site Selective

A highly efficient, site-selective, visible light-accelerated, remote C–H halogenation of unsymmetrical aromatic bisamides/amidoesters has been developed.

scholarly journals Resonant excitation of quantum emitters in gallium nitride

Optica ◽  
2018 ◽  
Vol 5 (8) ◽  
pp. 932
Author(s):  
Mehran Kianinia ◽  
Carlo Bradac ◽  
Minh Nguyen ◽  
Tongtong Zhu ◽  
Milos Toth ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Resonant Excitation ◽  
Quantum Emitters

Development of a visible-light-responsive rutile rod by site-selective modification of iron(III) ion on {111} exposed crystal faces

2010 ◽  
Vol 97 (1-2) ◽  
pp. 115-119 ◽  
Author(s):  
Naoya Murakami ◽  
Asami Ono ◽  
Misa Nakamura ◽  
Toshiki Tsubota ◽  
Teruhisa Ohno
Keyword(s):  
Visible Light ◽  
Site Selective
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