Abstract
Differences between the IR and Raman spectra of the dicaprolactamates of Mg, Ca, and Ba indicate differences in their structures. Barium dicaprolactamate has an ionic structure, while the dicaprolactamates of Mg and Ca are partially covalent and have one-dimensional chain structures with various types of NCO group (terminal, bridge). In solution the dicaprolactamates of Mg and Ca are associated on account of the formation of bridged NCO groups. It was shown that the vibration frequencies of the bridged NCO groups lie in the range 1580–1620 cm−1, and those of the terminal groups in the range 1550–1580 cm−1.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1570–1573, July, 1990.
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Garbuzova, I.A., Chekulaeva, L.A., Danilevskaya, L.B. et al. Vibrational spectra and structure of caprolactamates of group II metals. Russ Chem Bull 39, 1421–1424 (1990). https://doi.org/10.1007/BF00957851
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DOI: https://doi.org/10.1007/BF00957851