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Citation: Shi Nai, Jin Tianzhu, Weng Shifu, Wu Jinguang, Xu Guangxian. FTIR STUDY OF RARE EARTH TRIS(4,4,4-TRIFLUORO-1-(2-THIENYL)-1,3-BUTANEDIONE) DIHYDRATES[J]. Chinese Journal of Applied Chemistry, ;1984, 1(1): 48-55. shu

FTIR STUDY OF RARE EARTH TRIS(4,4,4-TRIFLUORO-1-(2-THIENYL)-1,3-BUTANEDIONE) DIHYDRATES

1.
Department of Chemistry, Peking University

Received Date: 26 July 1983

The FTIR spectra of fourteen rare earth tris (4,4,4-trifluoro-1-(2-thie-nyl)-1, 3-butanedione) dihydrates in the 100-4000 cm^-1 range have been studied and the assignment of peaks in the far and middle infrared region has been discussed. Six RE-O absorption bands were observed, two of which are in the mid-infrared region, namely 489-508 cm^-1 for the asym-metrical stretch and 456-475^-1cm for the symmetrical stretch. Four bands are in the far infrared region, three of them are assigned to the metal-che-late oxygen bonds, while the fourth band results from the coordination with the water molecule. The frequencies of the bands near 456-489^-1cm change periodically with atomic number, showing the "tetrad effect", which is characteristic of lanthanides. The absorption peak due to the carbonyl group and that due to the C=C bond are lowered by about 60cm^-1 respectively in comparison with the free HTTA. This is an evidence of conjugation inthe metal chelate rings.
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