Near IR spectroscopic studies on the interaction between acetamide and Ln(dpm)3 in carbon tetrachloride

Young Sang Choi, Hongsoon Kim, Jeong A. Yu, Sang Won Lee, Jeunghee Park, Chang Ju Yoon

Research output: Contribution to journalArticle

Abstract

The interactions between Ln(dpm)3 [Ln3+ = Eu3+, Yb3+, Pr3+, Sm3+, Tb3+ and Ho3+; dpm=tris 2,2,6,6-tetramethylheptane-3,5-dionate] and acetamide in CCl4 solution were investigated using near IR absorption spectroscopy. From the measured 2 νc=o+ amide III combination band of acetamide in the region of 2130-2180 nm (4695-4587 cm-1), it was found that acetamide is coordinating through its carbonyl oxygen atom to Ln(dpm)3 [C=O⋯Ln(dpm)3)] and forms only 1:1 stoichiometric Ln(dpm)3- acetamide complex. The ΔH° values for the formation of Ln(dpm)3-acetamide obtained from the temperature studies are -39.1, -28.4, -25.5, -24.7, -21.1 and -17.7 kJ mol-1 for Eu(dpm)3, Yb(dpm)3, Pr(dpm)3, Sm(dpm)3, Tb(dpm)3 and Ho(dpm)3, respectively, which are larger than those of the hydrogen bond between amide and various hydrogen acceptors. Except Eu(dpm)3 and Yb(dpm)3, -ΔH° value increases as the ionic size increases.

Original languageEnglish
Pages (from-to)511-514
Number of pages4
JournalBulletin of the Korean Chemical Society
Volume17
Issue number6
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Chemistry(all)

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