Helicene Radicals: Molecules Bearing a Combination of Helical Chirality and Unpaired Electron Spin

ChemPlusChem ◽  
2020 ◽  
Vol 85 (9) ◽  
pp. 2093-2104
Author(s):  
Fumito Tani ◽  
Masahiro Narita ◽  
Toshihiro Murafuji
Keyword(s):  
Electron Spin ◽  
Unpaired Electron ◽  
Helical Chirality

Do primary carriers of both positive charge and unpaired electron spin exist in irradiated propylene carbonate?

2017 ◽  
Vol 19 (1) ◽  
pp. 49-53 ◽  
Author(s):  
V. I. Borovkov
Keyword(s):  
Magnetic Field ◽  
Propylene Carbonate ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Positive Charge ◽  
Radical Cations ◽  
Carbonate Solutions ◽  
Solvent Molecules

Magnetic field sensitive fluorescence from irradiated propylene carbonate solutions indicates the existence of previously unobserved radical cations formed from the solvent molecules.

Unpaired Electron Spin Density Distribution across Reduced [2Fe-2S] Cluster Ligands by 13Cβ-Cysteine Labeling

2017 ◽  
Vol 57 (2) ◽  
pp. 741-746 ◽  
Author(s):  
Alexander T. Taguchi ◽  
Yoshiharu Miyajima-Nakano ◽  
Risako Fukazawa ◽  
Myat T. Lin ◽  
Amgalanbaatar Baldansuren ◽  
...  
Keyword(s):  
Density Distribution ◽  
Spin Density ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Spin Density Distribution ◽  
Electron Spin Density ◽  
Cysteine Labeling

Simultaneous Electron Spin–Nuclear Spin Transitions in Solid Solutions of Methyl Radicals

1974 ◽  
Vol 52 (13) ◽  
pp. 2471-2474 ◽  
Author(s):  
C. T. Cazianis ◽  
D. R. Eaton
Keyword(s):  
Water Molecule ◽  
Electron Spin ◽  
Solid Solutions ◽  
Unpaired Electron ◽  
Nuclear Spin ◽  
Ultraviolet Irradiation ◽  
Methyl Radicals ◽  
Methyl Radical ◽  
Neighboring Water Molecule ◽  
Spin Transitions

The e.s.r. spectra of methyl radicals produced by the ultraviolet irradiation of Tl(III) acetate show satellites attributed to simultaneous electron spin – nuclear spin transitions involving a proton of a neighboring water molecule. Measurement of the relative intensities of the satellites and the main transitions allows the average separation of the interacting proton from the unpaired electron to be calculated. Such measurements have been carried out over the temperature range −180 to −120 °C. The implications regarding the environment of the methyl radical in the ice matrix are briefly discussed.

scholarly journals Giant exchange coupling and field-induced slow relaxation of magnetization in Gd2@C79N with a single-electron Gd–Gd bond

2018 ◽  
Vol 54 (23) ◽  
pp. 2902-2905 ◽  
Author(s):  
G. Velkos ◽  
D. S. Krylov ◽  
K. Kirkpatrick ◽  
X. Liu ◽  
L. Spree ◽  
...  
Keyword(s):  
Electron Spin ◽  
Unpaired Electron ◽  
Exchange Coupling ◽  
Magnetic Moments ◽  
Slow Relaxation ◽  
Single Electron ◽  
Ferromagnetic Coupling

Single-electron Gd–Gd bond in Gd2@C79N results in giant ferromagnetic coupling between local 4f magnetic moments and unpaired electron spin.

Electron capture by oxyhaemoglobin: an e. s. r. study

1978 ◽  
Vol 201 (1144) ◽  
pp. 285-300 ◽  
Keyword(s):  
Electron Spin Resonance ◽  
Spin Density ◽  
Electron Capture ◽  
High Spin ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Spin Resonance ◽  
Paramagnetic Centres ◽  
Oxygen Atoms

Exposure of aqueous glasses containing oxyhaemoglobin to 60 Co γ rays at 77 K gave two similar paramagnetic centres whose electron spin resonance (e. s. r.) spectra resembled those of low-spin ferric derivatives. These were shown to be formed in the α and β chains by electron capture. The use of oxygen labelled with 17 O showed the presence of two inequiva­lent oxygen atoms and it is shown that the unpaired electron has consider­able spin density on the dioxygen ligand as well as on iron. When warmed above 77 K two new paramagnetic centres were formed, possibly as a result of protonation, before the formation of normal high-spin methaemoglobin, presumably by loss of HO 2 ¯ . Oxymyoglobin gave comparable centres.

ESR Study on Complexes Formed on Reaction of cis-Dichlorodiammineplatinum(II) with Cytosine and Cytidine

1982 ◽  
Vol 37 (6) ◽  
pp. 790-792 ◽  
Author(s):  
H. Neubacher ◽  
J. Krieger ◽  
P. Zaplatynski ◽  
W. Lohmann
Keyword(s):  
Aqueous Solution ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Esr Spectra ◽  
Metal Metal ◽  
Binuclear Metal

Abstract The ESR spectra of novel paramagnetic comple-xes between cis-dichlorodiammineplatinum(II) and cytosine or cytidine in aqueous solution are presented and discussed. The results imply a complex containing a binuclear metal-metal bonded platinum moiety with an unpaired electron spin delocalized over the dz2-orbitals.

Electron resonance studies of transition metal oxyions - II. Theory of electron resonance in manganate

1960 ◽  
Vol 254 (1276) ◽  
pp. 111-118 ◽  
Keyword(s):  
Electron Spin Resonance ◽  
Excited State ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Resonance Spectrum ◽  
Manganese Atom ◽  
Symmetry Type ◽  
Electron Resonance ◽  
Spin Resonance ◽  
First Excited State

It is shown that the detailed electron spin resonance spectrum of the manganate ion, (MnO 4 ) 2- , can be explained by assuming that the unpaired electron is in a doubly degenerate molecular orbital of symmetry type E and that the first excited state available to it is triply degenerate of symmetry type T 2 . The results indicate that the E orbital is largely concentrated on the manganese atom while the T 2 orbital is spread over the whole molecule. As a result of this analysis the quadrupole moment of 55 Mn is estimated to be 0·2 x 10 -24 cm 2 .

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