Controlled Light-Mediated Preparation of Gold Nanoparticles by a Norrish Type I Reaction of Photoactive Polymers

2015 ◽  
Vol 54 (43) ◽  
pp. 12612-12617 ◽  
Author(s):  
Florian Mäsing ◽  
Artur Mardyukov ◽  
Carsten Doerenkamp ◽  
Hellmut Eckert ◽  
Ursula Malkus ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Type I ◽  
Norrish Type ◽  
Photoactive Polymers

Photochemical routes to silver and gold nanoparticles

2009 ◽  
Vol 81 (4) ◽  
pp. 635-647 ◽  
Author(s):  
Juan C. Scaiano ◽  
Paul Billone ◽  
Carlos M. Gonzalez ◽  
Luca Marett ◽  
M. Luisa Marin ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metal Ions ◽  
Careful Consideration ◽  
Type I ◽  
Micellar Solutions ◽  
Aromatic Ketones ◽  
Silver And Gold Nanoparticles ◽  
Spontaneous Formation ◽  
Norrish Type

The photochemistry of aromatic ketones through the Norrish type I cleavage of benzoins and via photoreduction generates ketyl radicals that readily reduce many metal ions, including silver and gold. Reduction to Au(0) and Ag(0) leads to the spontaneous formation of nanoparticles (NPs) in aqueous or micellar solutions. Careful consideration of kinetic factors to minimize triplet quenching by metal ions can lead to rapid NP generation. These materials are quite stable and have interesting reactivities due to the essentially unprotected characteristics of the surface.

2D NMR Nutation Analysis of Non-Thermal Polarization of Coupled Multi-Spin Systems

2003 ◽  
Vol 217 (12) ◽  
pp. 1641-1659 ◽  
Author(s):  
K. L. Ivanov ◽  
K. Miesel ◽  
Hans-Martin Vieth ◽  
A. V. Yurkovskaya ◽  
R. Z. Sagdeev
Keyword(s):  
Pulse Length ◽  
2D Nmr ◽  
Mutual Orientation ◽  
Type I ◽  
Equilibrium System ◽  
Rate Determining Step ◽  
Chemically Induced ◽  
Norrish Type ◽  
Radio Frequency Excitation ◽  
Thermal Polarization

AbstractA new, convenient method of analyzing the spin polarization of a non-equilibrium system of N coupled nuclei is described and applied to photo-reactions exhibiting chemically induced dynamic nuclear polarization (CIDNP). It is based on the Fourier analysis of the variation of NMR line intensities as a function of the radio frequency excitation pulse length. A relationship between the spectral components at various harmonic order and the alignment in the spin multiplet is established. In application to the Norrish type I photolysis of cyclodecanone we demonstrate that at low magnetic field the rate determining step in the reaction kinetics depends on the mutual orientation of at least four pairs of non-equivalent spins.

Naphthalimide Aryl Sulfide Derivative Norrish Type I Photoinitiators with Excellent Stability to Sunlight under Near-UV LED

2019 ◽  
Vol 52 (4) ◽  
pp. 1707-1717 ◽  
Author(s):  
Jia Yu ◽  
Yanjing Gao ◽  
Shengling Jiang ◽  
Fang Sun
Keyword(s):  
Type I ◽  
Uv Led ◽  
Norrish Type ◽  
Aryl Sulfide ◽  
Excellent Stability
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