Citation:
Gao Hongcheng, Wu Jinguang, Weng shifu, Xu Guangxian. THE FOURIER TRANSFORM INFRARED SPECTRA OF FIFTEEN RARE EARTH-EHPAEH COMPLEXES[J]. Chinese Journal of Applied Chemistry,
;1984, 1(2): 36-40.
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2-Ethylhexylphosphonic acid mono(2-ethylhexyl) ester (EHPAEH) is a more effective extractant than D2EHPA for extraction of rare earths.Fifteen solid and solution rare earth-EHPAEH complexes in kerosine have been prepared and their FT-IR spectra have also been studied using a subtraction technique. In the FT-IR subtraction spectra of either the extracted species in the organic phase or the solid complexes, a positive peak and a negative one were observed corresponding to νP=O→M and νP=O respectively, or to νP-O-M and νP-O-H respectively. The variation of νP=O→M, νP-O-M and νO-M (150cm-1) with the atomic number of lanthanides was shown in Fig.5 and Fig.7 for the solid com-plexes. These curves show an obvious "tetrad effect", Y being located be-tween Er and Tm.
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