+ Site Statistics
References:
54,258,434
Abstracts:
29,560,870
PMIDs:
28,072,757
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Electron paramagnetic resonance of three-spin nitroxide-copper(II)-nitroxide clusters coupled by a strong exchange interaction



Electron paramagnetic resonance of three-spin nitroxide-copper(II)-nitroxide clusters coupled by a strong exchange interaction



Journal of Physical Chemistry. a 110(7): 2315-2317



The complex of Cu(2+) hexafluoroacetylacetonate with two pyrazol-substituted nitronyl nitroxides represents an unusual exchange-coupled three-spin system. The antiferromagnetic exchange coupling, which already atT < 150 K is larger than the thermal energy kT, induces the transition from a total spin state S = (3)/(2) to a state S = (1)/(2) and produces static spin polarization. Anomalous electron paramagnetic resonance (EPR) spectra of an S = (1)/(2) state were detected experimentally and described theoretically. The effective g factor of the three-spin system is smaller than 2, despite the fact that all the individual components have g > 2. The observed signals with g < 2 are highly informative and can be employed for determination of the sign and value of the exchange interaction in three-spin nitroxide-copper-nitroxide clusters.

(PDF emailed within 0-6 h: $19.90)

Accession: 048933329

Download citation: RISBibTeXText

PMID: 16480287

DOI: 10.1021/jp0573792


Related references

Electron paramagnetic resonance line shifts and line shape changes due to spin exchange of nitroxide free radicals in liquids. 7. Singly charged surfactant nitroxide. Journal of Physical Chemistry. a 113(33): 9295-9303, 2009

Light-induced excited spin state trapping in an exchange-coupled nitroxide-copper(II)-nitroxide cluster. Angewandte Chemie 47(36): 6897-6899, 2008

Long-distance magnetic interaction of exchange-coupled copper dimers with nitronyl nitroxide and tert-butyl nitroxide radicals. Inorganic Chemistry 48(15): 7244-7250, 2009

W-band time-resolved electron paramagnetic resonance study of light-induced spin dynamics in copper-nitroxide-based switchable molecular magnets. Journal of the American Chemical Society 134(39): 16319-16326, 2012

Magnetic resonance imaging of biological specimens by electron paramagnetic resonance of nitroxide spin labels. Science 227(4686): 517-519, 1985

Simulating electron spin resonance spectra of macromolecules labeled with two dipolar-coupled nitroxide spin labels from trajectories. Physical Chemistry Chemical Physics 13(28): 12785-12797, 2012

Nucleoside containing a rigid nitroxide spin-label for studies of nucleic acids by electron paramagnetic resonance spectroscopy. Abstracts of Papers American Chemical Society 224(1-2): CARB 63, 2002

Using nitroxide spin labels. How to obtain T1e from continuous wave electron paramagnetic resonance spectra at all rotational rates. Biophysical Journal 64(3): 594-604, 1993

Use of nitroxide spin probes and electron paramagnetic resonance for assessing reducing power of beer. role of SH groups. Journal of Agricultural and Food Chemistry 53(4): 1052-1057, 2005

Strong ferromagnetic exchange couplings in copper(II) and nickel(II) complexes with a paramagnetic tridentate chelate ligand, 2,2'-bipyridin-6-yl tert-butyl nitroxide. Journal of the American Chemical Society 128(43): 14008-9, 2006

Structural Dynamics in a "Breathing" Metal-Organic Framework Studied by Electron Paramagnetic Resonance of Nitroxide Spin Probes. Journal of Physical Chemistry Letters 5(1): 20-24, 2014

Inherent Microporosity and Photostability of Fluoroacrylic Polymer Films Studied by Electron Paramagnetic Resonance of Nitroxide Spin Probes. Applied Magnetic Resonance 46(5): 523-540, 2015

On the possible manifestation of harmonic-anharmonic dynamical transition in glassy media in electron paramagnetic resonance of nitroxide spin probes. Journal of Chemical Physics 125(5): 054502, 2006

Exploring Structure, Dynamics, and Topology of Nitroxide Spin-Labeled Proteins Using Continuous-Wave Electron Paramagnetic Resonance Spectroscopy. Methods in Enzymology 564: 59-100, 2016

Subcellular distribution of a nitroxide spin-labeled netropsin in living KB cells. Electron paramagnetic resonance and sequence specificity studies. Biochemical Pharmacology 38(10): 1625-1630, 1989