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Delocalization of spin projection in weak exchange linear chains, evidenced by multi‐frequency HF‐EPR spectroscopy
Author(s) -
Popescu F. F.,
Martinelli M.,
Massa C. A.,
Pardi L. A.,
Bercu V.
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1679
Subject(s) - chemistry , electron paramagnetic resonance , delocalized electron , spectroscopy , spin (aerodynamics) , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , condensed matter physics , molecular physics , computational chemistry , stereochemistry , quantum mechanics , physics , organic chemistry , thermodynamics
High‐field electron paramagnetic resonance (HF‐EPR) spectroscopy was used to investigate the unusual temperature and frequency dependence of the powder spectrum of the Gd(HBPz 3 ) 2 tropolonate complex (GdTrp). A new type of H/T effect is evidenced. This effect is interpreted in terms of the formation of spin projection states delocalized and quasidelocalized along linear chains of Gd 3+ ions in high magnetic fields due to the competition between the weak dipole and exchange spin–spin interaction and the particular structure of the molecular complex. The number of ions in the chain depends strongly on the orientation of the magnetic field and on the relaxation processes. Copyright © 2005 John Wiley & Sons, Ltd.