Time-Resolved EPR Spectra of Spin-Correlated Radical Pairs: Spectral and Kinetic Modulation Resulting from Electron−Nuclear Hyperfine Interactions

2010 ◽  
Vol 114 (1) ◽  
pp. 162-171 ◽  
Author(s):  
Qixi Mi ◽  
Mark A. Ratner ◽  
Michael R. Wasielewski
Keyword(s):  
Hyperfine Interactions ◽  
Epr Spectra ◽  
Radical Pairs ◽  
Time Resolved

scholarly journals Synthesis, Biomacromolecular Interactions, Photodynamic NO Releasing and Cellular Imaging of Two [RuCl(qn)(Lbpy)(NO)]X Complexes

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2545
Author(s):  
Luna Song ◽  
Hehe Bai ◽  
Chenyang Liu ◽  
Wenjun Gong ◽  
Ai Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Confocal Imaging ◽  
Epr Spectra ◽  
Distorted Octahedral Geometry ◽  
Ionization Mass ◽  
Time Resolved ◽  
Pbr322 Dna ◽  
Vis Spectroscopy ◽  
No Release ◽  
Ft Ir

Two light-activated NO donors [RuCl(qn)(Lbpy)(NO)]X with 8-hydroxyquinoline (qn) and 2,2′-bipyridine derivatives (Lbpy) as co-ligands were synthesized (Lbpy1 = 4,4′-dicarboxyl-2,2′-dipyridine, X = Cl− and Lbpy2 = 4,4′-dimethoxycarbonyl-2,2′-dipyridine, X = NO3−), and characterized using ultraviolet–visible (UV-vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (1H NMR), elemental analysis and electrospray ionization mass spectrometry (ESI-MS) spectra. The [RuCl(qn)(Lbpy2)(NO)]NO3 complex was crystallized and exhibited distorted octahedral geometry, in which the Ru–N(O) bond length was 1.752(6) Å and the Ru–N–O angle was 177.6(6)°. Time-resolved FT-IR and electron paramagnetic resonance (EPR) spectra were used to confirm the photoactivated NO release of the complexes. The binding constant (Kb) of two complexes with human serum albumin (HSA) and DNA were quantitatively evaluated using fluorescence spectroscopy, Ru-Lbpy1 (Kb~106 with HSA and ~104 with DNA) had higher affinity than Ru-Lbpy2. The interactions between the complexes and HSA were investigated using matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF-MS) and EPR spectra. HSA can be used as a carrier to facilitate the release of NO from the complexes upon photoirradiation. The confocal imaging of photo-induced NO release in living cells was successfully observed with a fluorescent NO probe. Moreover, the photocleavage of pBR322 DNA for the complexes and the effect of different Lbpy substituted groups in the complexes on their reactivity were analyzed.

Pulsed and time-resolved EPR studies of transient radicals, radical pairs and excited states in photochemical systems

2007 ◽  
pp. 130-163 ◽  
Author(s):  
Hisao Murai ◽  
Shozo Tero-Kubota ◽  
Seigo Yamauchi
Keyword(s):  
Excited States ◽  
Radical Pairs ◽  
Time Resolved ◽  
Photochemical Systems

ChemInform Abstract: TIME-RESOLVED LASER FLASH SPECTROSCOPIC STUDY OF BENZYL RADICAL PAIRS IN MICELLE CAGES

1981 ◽  
Vol 12 (44) ◽  
Author(s):  
N. J. TURRO ◽  
M.-F. CHOW ◽  
C.-J. CHUNG ◽  
Y. TANIMOTO ◽  
G. C. WEED
Keyword(s):  
Spectroscopic Study ◽  
Laser Flash ◽  
Radical Pairs ◽  
Time Resolved ◽  
Benzyl Radical

ChemInform Abstract: Pulsed and Time-resolved EPR Studies of Transient Radicals, Radical Pairs and Excited States in Photochemical Systems

ChemInform ◽  
2001 ◽  
Vol 32 (20) ◽  
pp. no-no
Author(s):  
Hisao Murai ◽  
Shozo Tero-Kubota ◽  
Seigo Yamauchi
Keyword(s):  
Excited States ◽  
Radical Pairs ◽  
Time Resolved ◽  
Photochemical Systems

scholarly journals Transient radical pairs studied by time-resolved EPR

2005 ◽  
Vol 1707 (1) ◽  
pp. 117-126 ◽  
Author(s):  
Robert Bittl ◽  
Stefan Weber
Keyword(s):  
Radical Pairs ◽  
Time Resolved

Time-resolved studies of radical pairs

2009 ◽  
Vol 37 (2) ◽  
pp. 358-362 ◽  
Author(s):  
Jonathan R. Woodward ◽  
Timothy J. Foster ◽  
Alex R. Jones ◽  
Adrian T. Salaoru ◽  
Nigel S. Scrutton
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Chemical Reactions ◽  
Radical Pair ◽  
Radical Pair Mechanism ◽  
Magnetic Field Effects ◽  
Radical Pairs ◽  
Time Resolved ◽  
Field Effects ◽  
Field Sensitivity

The effect of magnetic fields on chemical reactions through the RP (radical pair) mechanism is well established, but there are few examples, in the literature, of biological reactions that proceed through RP intermediates and show magnetic field-sensitivity. The present and future relevance of magnetic field effects in biological reactions is discussed.

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