The infrared spectrum of europium acetylacetonate has been observed from 4000 to 200 cm−1 and a normal-coordinate calculation for the in-plane vibrations of the 1:1 single ring complex has been carried out. The Eu–O stretching frequencies are found to be in the region from 400 to 200 cm−1 and the Eu–O stretching force constant is estimated to be about 1.43×105 dyn/cm. The interpretation of the spectrum is discussed generally.
The electronic absorption spectra for NO2-N2O4 mixtures has been measured in various non-polar and polar solvents. In non-polar solvents the spectrum is very similar to NO2-N2O4 mixtures in the gas state. However, in solvents with unshared electron pairs available particularly ethers, esters, ketones and tertiary amines, a complex multi-banded spectrum is observed at room temperature. This spectrum appears to be characteristic of NO2-N2O4 in those solvents and to be the result of the same electron donor-acceptor type molecular complexes reported previously in the literature at lower temperatures in the solid state. In olefins and n-alkyl amines reactions occur and the products formed are discussed.
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