ESR spectroscopy of copper(II) complexes with aza-containing and thia-containing crown-ethersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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. The g and HFI tenser 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 sigma- and pi-type metal ion and ligand AO were estimated from ESR and absorption spectra using LCAO MO method. Both sigma- and pi-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.