Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9694083 | Thermochimica Acta | 2005 | 4 Pages |
Abstract
Complexation of copper(II) ion with some amide solvents such as N-methylformamide (NMF), formamide (FA), N,N-dimethylacetamide (DMA) and N-methylacetamide (NMA) has been studied by titration calorimetry in acetonitrile containing 0.1 mol dmâ3 (C2H5)4ClO4 as an ionic medium at 298 K. These amides coordinate to the metal ion to form a series of mononuclear complexes, and their formation constants, enthalpies and entropies have been obtained. Thermodynamic parameters of formation of Cu(NMF)2+ and Cu(FA)2+ are not significantly different from those of Cu(DMF)2+ (DMF: N,N-dimethylformamide), implying that a strong hydrogen-bonded structure of liquid NMF and FA are practically ruptured in the acetonitrile solution examined. The formation of Cu(DMA)2+ and Cu(NMA)2+ are appreciably less exothermic than the respective formation of Cu(DMF)2+ and Cu(NMF)2+ complexes, implying that the presence of the acetyl group causes steric hindrance upon its coordination to the metal ion.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Kenta Fujii, Toshihiko Endoh, Masatoki Yokoi, Yasuhiro Umebayashi, Shin-Ichi Ishiguro,