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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/5676

Title: Synthesis and structure of tridentate bis(phosphinic amide)-phosphine oxide complexes of yttrium nitrate. Applications of (31)P,(89)Y NMR methods in structural elucidation in solution
Author(s): Popovici, Cristinel
Fernández de las Nieves, Ignacio
Oña Burgos, Pascual
Roces Fernández, Laura
García-Granda, Santiago
López Ortiz, Fernando
Issue date: 2011
Publisher version: http://dx.doi.org/10.1039/c1dt10194c
Citation: Dalton Transactions, 40(25), p. 6691-6703 (2011); doi:10.1039/c1dt10194c
Format extent: p. 6691-6703
Abstract: The synthesis and characterisation of a tridentate ligand containing two diphenylphosphinic amide side-arms connected through the ortho position to a phenylphosphine oxide moiety and the 1 : 1 and 2 : 1 complexes formed with yttrium nitrate are reported for the first time. The free ligand (RP1*,SP3*)-11 is obtained diastereoselectively by reaction of ortho-lithiated N,N-diisopropyl-P,P-diphenylphosphinic amide with phenylphosphonic dichloride. Complexes [Y((RP1*,SP3*)-11)(NO3)3] and [Y((RP1*,SP3*)-11)2(NO3)](NO3)2 were isolated by mixing ligand 11 with Y(NO3)3·6H2O in acetonitrile at room temperature in a ligand to metal molar ratio of 1 : 1 and 2 : 1, respectively. The 1 : 1 derivative is the product of thermodynamic control when a molar ratio of ligand to yttrium salt of 1 : 1 is used. The new compounds have been characterised both as the solid (X-ray diffraction) and in solution (multinuclear magnetic resonance). In both yttrium complexes the ligand acts as a tridentate chelate. The arrangement of the two ligands in the 2 : 1 complex affords a pseudo-meso structure. Tridentate chelation of yttrium(III) in both complexes is retained in solution as evidenced by 89Y NMR data obtained via31P,89Y-HMQC, and 89Y,31P-DEPT experiments. The investigation of the solution behaviour of the Y(III) complexes through PGSE NMR diffusion measurements showed that average structures in agreement with the 1 : 1 and 1 : 2 stoichiometries are retained in acetonitrile.
URI: http://hdl.handle.net/10651/5676
ISSN: 1477-9226
Local identifier: 20111431
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