ISSN:
1573-9171
Keywords:
crown ethers
;
ESR
;
complexes with copper(ii)
;
electron absorption spectroscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Six copper(ii) chloride complexes with crown ethers containing besides oxygen also nitrogen or sulfur atoms in 15- or 18-membered cycle were studied by ESR and electron absorption spectroscopies. Theg and HFI tensor components determined by spectral simulation indicate rhombic symmetry and localization of an unpaired electron on the d xy orbital for all the complexes. The unpaired electron fractions on σ- and π-type metal ion and ligand AO were estimated from ESR and absorption spectra using LCAO MO method. Both σ- and π-type bond covalences were shown to be greater in these complexes compared to only oxygen-containing crown ether complexes. The temperature dependence of g and A components in some complexes may be due to conformational changes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00696310
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