TY - JOUR
T1 - Near IR spectroscopic studies on the interaction between acetamide and Ln(dpm)3 in carbon tetrachloride
AU - Choi, Young Sang
AU - Kim, Hongsoon
AU - Yu, Jeong A.
AU - Lee, Sang Won
AU - Park, Jeunghee
AU - Yoon, Chang Ju
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
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M3 - Article
AN - SCOPUS:18444405253
SN - 0253-2964
VL - 17
SP - 511
EP - 514
JO - Bulletin of the Korean Chemical Society
JF - Bulletin of the Korean Chemical Society
IS - 6
ER -