EPR and Spectral Studies of a Molecular and Crystal Structure of Cu (3,5-dimethylpyridine)_{3}(NO_{3})_{2}

Hoffmann, S.; Goher, M.; Hilczer, W.; Goslar, J.; Hafez, A.

doi:10.12693/APhysPolA.85.517

Journal

Acta Physica Polonica A

1994 | 85 | 3 | 517-530

Article title

EPR and Spectral Studies of a Molecular and Crystal Structure of Cu (3,5-dimethylpyridine)_{3}(NO_{3})_{2}

Authors

S. Hoffmann , M. Goher , W. Hilczer , J. Goslar , A. Hafez

Content

Full texts:

http://przyrbwn.icm.edu.pl/APP/PDF/85/a085z3p04.pdf [remote]

Title variants

Languages of publication

Abstracts

X-band single crystal EPR, IR and UV-VIS data are used to deduce a molecular and crystal structure of a new compound with a chemical formula Cu(3,5-dimethylpyridine)_{3}(NO_{3})_{2}. EPR shows that four magnetically inequivalent molecules exist in the crystal unit cell of C_{4v} symmetry. IR spectra suggested that both monodentate and bidentate NO_{3}-groups exist in the crystal. A most probable Cu(II) complex geometry with d_{x²-y²} ground state is a square pyramid with three nitrogens from 3,5-dimethylpyridine molecules and one oxygen from monodentate nitrato group in a basal plane and an oxygen from NO_{3}-group in apical position. There exists a chemical contact between complexes as it is indicated by the exchange interaction with |J| ≤ 1 cm^{-1}. It suggests that square pyramid complexes are arranged in polymeric chains with semi-coordination of bidentate NO_{3}-group to the adjacent Cu(II) ion. An extended analysis of an exchange averaging effect between EPR lines from two and four Cu(II) sites is presented with equations relating molecular and crystal g-factors.

Keywords

33.20.Ea 61.66.-f 76.30.Da

Discipline

Publisher

Journal

Acta Physica Polonica A

Year

1994

Volume

Issue

Pages

517-530

Physical description

Dates

published

1994-03

received

1993-10-22

Contributors

author

S. Hoffmann

Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

M. Goher

University of Alexandria, Department of Chemistry, Alexandria 21321-Ibrahimia, Egypt

author

W. Hilczer

Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

J. Goslar

Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

A. Hafez

University of Alexandria, Department of Chemistry, Alexandria 21321-Ibrahimia, Egypt

References

Document Type

Publication order reference

Identifiers

DOI

10.12693/APhysPolA.85.517

YADDA identifier

bwmeta1.element.bwnjournal-article-appv85z304kz