ABSTRACT
The solid-state behaviour of two series of isomeric, phenol-substituted, aminomethylphosphines, as the free ligands and bound to PtII, have been extensively studied using single crystal X-ray crystallography. In the first library, isomeric diphosphines of the type Ph2PCH2N(Ar)CH2PPh2 [1a-e; Ar = C6H3(Me)(OH)] and, in the second library, amide-functionalised, isomeric ligands Ph2PCH2N{CH2C(O)NH(Ar)}CH2PPh2 [2a-e; Ar = C6H3(Me)(OH)], were synthesised by reaction of Ph2PCH2OH and the appropriate amine in CH3OH, and isolated as colourless solids or oils in good yield. The non-methyl, substituted diphosphines Ph2PCH2N{CH2C(O)NH(Ar)}CH2PPh2 [2f, Ar = 3-C6H4(OH); 2g, Ar = 4-C6H4(OH)] and Ph2PCH2N(Ar)CH2PPh2 [3, Ar = 3-C6H4(OH)] were also prepared for comparative purposes. Reactions of 1a-e, 2a-g, or 3 with PtCl2(η4-cod) afforded the corresponding square-planar complexes 4a-e, 5a-g, and 6 in good to high isolated yields. All new compounds were characterised using a range of spectroscopic (1H, 31P{1H}, FT-IR) and analytical techniques. Single crystal X-ray structures have been determined for 1a, 1bâCH3OH, 2fâCH3OH, 2g, 3, 4bâ(CH3)2SO, 4câCHCl3, 4dâ½Et2O, 4eâ½CHCl3â½CH3OH, 5aâ½Et2O, 5b, 5câ»H2O, 5dâEt2O, and 6â(CH3)2SO. The free phenolic group in 1bâCH3OH, 2fâCH3OH,2g, 4bâ(CH3)2SO, 5aâ½Et2O, 5câ»H2O, and 6â(CH3)2SO exhibits various intra- or intermolecular O-HâââX (X = O, N, P, Cl) hydrogen contacts leading to different packing arrangements.