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Title: Quadrupole effects in the EPR spectra of bis [1, 3-di (p-n-octyloxyphenyl propane-1, 3 dionato] Cu(II]: Role in phase transitions
Authors: Bose, Monisha
Sadashiva, B.K.
Issue Date: 1991
Publisher: Gordon and Breach Science Publishers.
Citation: Molecular Crystals and Liquid Crystals Letters, 1992, Vol.8, p137-143
Abstract: X band studies of alkyl/alkloxy phenyl substituted Cu complexes indicate that only C80-Cu exhibits a complex hyperfine structure (h.f.s.) at 300K. It also undergoes a first-order phase transition around 213K. However, the complex h.f .s. could not be delineated at X band. In the Q band, in addition to the four permitted h.f. lines, 10 for- bidden lines due to quadrupole effects are obser- ved. Further, the forbidden lines disappear in the discophase but the permitted h.f. lines remain. This difference between C80-Cu and C8Cu could be explained from their crystal structures. In C80-Cu, the repeating unit is a Cu dimer, as oppo- sed to a single Cu atom placed at the inversion centre in C Cu. Distortion in the dimer, possibly n accounts for the observed quadrupole effects.
Description: Restricted Access.
ISSN: 0140-6566
Copyright: 1992 OPA (Overseas Publishers Association) N.V.
Appears in Collections:Research Papers (SCM)

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