Lanthanide nitrate complexes of diphenylmethylphosphine oxide: synthesis and spectroscopic studies. Crystal structures of [La(Ph2MePO)3(NO3)3], [La(Ph2MePO)4(NO3)3]·xMe2CO and [Yb(Ph2MePO)4(NO3)2]PF6
| Autor: | Michael Webster, Matthew Bosson, Michael C Popham, William Levason, Tajesh Patel |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Phosphine oxide
Lanthanide Denticity Chemistry Inorganic chemistry Conductance chemistry.chemical_element Crystal structure Nuclear magnetic resonance spectroscopy Inorganic Chemistry Metal Crystallography chemistry.chemical_compound visual_art Materials Chemistry visual_art.visual_art_medium Lanthanum Physical and Theoretical Chemistry |
| Zdroj: | Polyhedron. 20:2055-2062 |
| ISSN: | 0277-5387 |
| Popis: | The reaction of Ln(NO3)3·6H2O (Ln=lanthanide except Pm) with Ph2MePO in a 1:3 or 1:4 ratio in acetone or ethanol produces [Ln(Ph2MePO)3(NO3)3] which have been characterised by analysis, IR, 1H and 31P{1H} NMR spectroscopy and conductance measurements. The [Ln?(Ph2MePO)3(NO3)3] (Ln?=Pr–Tb) exist only as tris complexes in solution and are unaffected by the presence of excess Ph2MePO. In contrast the [Ln?(Ph2MePO)3(NO3)3] (Ln?=Ho–Lu) partially decompose in CH2Cl2 solution into [Ln?(Ph2MePO)4(NO3)2]+, and [Ln?(Ph2MePO)4(NO3)2]PF6 are readily isolated from Ln?(NO3)3, Ph2MePO and NH4PF6 in acetone. For lanthanum only, a neutral 1:4 complex [La(Ph2MePO)4(NO3)3] was isolated. X-ray crystal structures show that [La(Ph2MePO)3(NO3)3] contains nine-coordinate La, whilst [La(Ph2MePO)4(NO3)3]·xMe2CO contains a ten-coordinate metal centre. The structure of [Yb(Ph2MePO)4(NO3)2]PF6 reveals an eight-coordinate cation and all complexes contain bidentate nitrato-groups. |
| Databáze: | OpenAIRE |
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