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, 1b∙CH3OH, 2f∙CH3OH, 2g, 3, 4b∙(CH3)2SO, 4c∙CHCl3, 4d∙½Et2O, 4e∙½CHCl3∙½CH3OH, 5a∙½Et2O, 5b, 5c∙¼H2O, 5d∙Et2O, and 6∙(CH3)2SO. The free phenolic group in 1b∙CH3OH, 2f∙CH3OH, 2g, 4b∙(CH3)2SO, 5a∙½Et2O, 5c∙¼H2O, and 6∙(CH3)2SO exhibits various intra- or intermolecular O–H∙∙∙X (X = O, N, P, Cl) hydrogen contacts leading to different packing arrangements.
Highlights
Tertiary phosphines, and their phosphine oxides, have played an important role in the study of supramolecular and self-assembly processes [1,2,3]
We have shown that the N-arene group can be tuned with, for example, various H-bonding donor/acceptor sites based on –CO2H/OH groups [12,13,14,15,16]. In continuation of these studies, we report here our work on the regioselective positioning of amide/hydroxy and methyl groups within a series of aminomethylphosphines, both as the free ligands and when coordinated to a square-planar Pt(II) metal centre
In continuation of these studies, we report here our work on the regioselective positioning of amide/hydroxy and methyl groups within a series of aminomethylphosph2 ionf e21s, both as the free ligands and when coordinated to a square-planar Pt(II) metal centre
Summary
Their phosphine oxides, have played an important role in the study of supramolecular and self-assembly processes [1,2,3]. There is no intramolecular N–H···N H-bond, instead the ortho hydroxyl forms an intramolecular H-bond with the amide oxygen with d = 1.80 and 1.77(4) Å in the molecules containing Pt(1) and Pt(2), respectively This does leave the two unique amide NH atoms free to form intermolecular interactions, which they do via highly asymmetric, bifurcated H-bonds with the coordinated chloride ligands on adjacent Pt complexes. Here the amide NH is involved in the 1D chain propagation (Figure 13), forming a symmetrical bifurcated H-bond with the two coordinated chloride ligands on the adjacent molecule with d = 2.66(15) Å Supporting this is an additional (Ar)C–H(5)∙∙∙Pt(1) interaction at 2.78 Å. FFiigguurree1144..PaPcakciknigngplpoltoitninthtehcerycrsytasltasltrsutrcutucrtue roef o5fb5. bP.hePnhyelngyrlogurposuapnsdanhyddhroygderongaetnomatsonmost nino-t vionlvvoeldveind hinydhryodgreongebnonbodnindginhgavheavbeeebneeonmoimtteitdtefdorfocrlacrliatyri.ty
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