Compounds formed from the reaction of N,N,N',N'-tetramethylsuccinamide (TMSA) with trivalent lanthanide salts possessing the poorly coordinating counteranions triflate (CF3SO3-) and perchlorate (ClO4-) have been prepared and examined. Structural features of these Ln-TMSA compounds have been studied in the solid phase by thermogravimetric analysis, infrared spectroscopy, and single crystal X-ray diffraction and in solution by infrared spectroscopy. Eight-coordinate compounds derived from coordination of four bidentate, succinamide ligands to the metal ion could be formed with all lanthanides examined. The binding of the succinamide ligand to the lanthanide metal is significantly asymmetric, with differences between the M-O(amide) bond distances for a chelating succinamide of around 0.06 ? and differences in the M-O-C bond angles of around 28?. Fourier transform-infrared spectroscopy studies in anhydrous acetonitrile suggest that the solid-state structure is maintained in solution.
Revised: March 28, 2002 |
Published: October 16, 2000
Citation
Rapko B.M., B.K. McNamara, R.D. Rogers, G.A. Broker, G.J. Lumetta, and B.P. Hay. 2000.Coordination of Lanthanide Triflates and Perchlorates with N,N,N',N'-Tetramethylsuccinamide.Inorganic Chemistry 39, no. 21:4858-4867.PNNL-SA-32652.