کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1624335 | 1516421 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Structural studies of lanthanide nitrate–N,N′-dimethyl-N,N′-diphenylpyridine-2,6-dicarboxyamide complexes Structural studies of lanthanide nitrate–N,N′-dimethyl-N,N′-diphenylpyridine-2,6-dicarboxyamide complexes](/preview/png/1624335.png)
The tridentate ligand N,N′-dimethyl-N,N′-diphenylpyridine-2,6-dicarboxyamide (DMDPhPDA) and the corresponding lanthanum complex [La(NO3)3(DMDPhPDA)2] have been prepared and structurally characterised. The crystal structure of DMDPhPDA shows syn–anti conformation. In the lanthanum complex, two DMDPhPDA molecules coordinated to La(III) in a tridentate fashion and to three nitrate ions in a bidentate fashion make the lanthanum atom 12-coordinate. The crystal structure of [La(NO3)3(DMDPhPDA)2] has a C2 symmetry. The stability constants determined by spectrophotometric titration suggest that [Ln(DMDPhPDA)2]3+ is the primary product in CH3CN solution and [Ln(DMDPhPDA)3]3+ is difficult to form. However, [Ln(DMDPhPDA)2]3+ could not be distinguished in 1H NMR spectra. The 1H NMR titration results imply that a fast ligand exchange process takes place.
Journal: Journal of Alloys and Compounds - Volume 456, Issues 1–2, 29 May 2008, Pages 429–435