摘要:
The tris-chelated Sb-III, Bi-III, and Cr-III complexes containing diselenophosphinate ligands, [(PhCH2CH2)(2) PSe2](-) and [Ph2PSe2](-), have been synthesized and fully characterized by X-ray crystallography, solution NMR (P-31, Se-77, and H-1), UV-Vis and ESI-mass techniques. X-ray diffraction analysis reveals that the M(Se2PR2)(3) (M = Sb, Bi and Cr) complexes are isostructural. In each of the compounds, the metal center is chelated by the three diselenophosphinate ligands in a distorted octahedral configuration. The M(Se2P)(3) fragment formed is similar to a three-bladed propeller. In Bi-III and Cr-III complexes, the R2PSe2- anions act as isobidentate ligands, whereas the anisobidentate nature of these anions in Sb-III complexes is observed. In the crystal packing of the complexes [except for Cr(Se2PPh2)(3)], there are supramolecular Se center dot center dot center dot Se interactions between adjacent molecules, which lead to a loosely connected dimer. (C) 2013 Elsevier Ltd. All rights reserved.