Résumé
Two diethyl phosphonated phosphine ligands of formula Ph
2P(CH
2)
3PO
3Et
2 (ligand
L) and Ph
2P(4-C
6H
4PO
3Et
2) (ligand
L′) were used to prepare different complexes of platinum(II) (
1,
cis-PtCl
2L
2;
2,
trans-PtCl
2L
2·H
2O;
3A and
3B,
cis- and
trans-PtCl
2L′
2) and palladium(II) (
4, [PdCl
2L]
2;
5,
trans-PdCl
2L
2·H
2O;
6,
trans-PdCl
2L′
2·CH
2Cl
2). The single-crystal X-ray structure analyses of complexes
1,
2,
4–
6 indicate that complexation involved only the phosphine end, whereas the strong polarization of the PO bond was highlighted by the formation of hydrogen bonds with a water molecule in
2 and
5, and with a dichloromethane molecule in
6, with an exceptionally short CH⋯O hydrogen bond length (C⋯O separation 3.094(3) Å).
The single-crystal X-ray structure analysis of complexes of Pt(II) and Pd(II) with the phosphine-phosphonate ligands Ph
2P(CH
2)
3PO
3Et
2 (
L) and Ph
2P(4-C
6H
4PO
3Et
2) (
L′) (
cis-PtCl
2L
2;
trans-PtCl
2L
2·H
2O; [PdCl
2L]
2;
trans-PdCl
2L
2·H
2O;
trans-PdCl
2L′
2·CH
2Cl
2) indicates that complexation involves only the phosphine end, whereas the phosphoryl group forms hydrogen bonds with a water molecule or a dichloromethane molecule.