31P and 195Pt NMR studies of the cluster complexes [Pt3(μ2-CO)3 (tertiary phosphine)3]

Reaction of [Pt3(μ-CO)3(PCy3)3] with tin dichloride

“…The central lines are flanked by satellite peaks due to scalar coupling with 195 Pt and 119 Sn nuclei, which are characteristic for triangular geometry. The values of 1 J(Pt-P) coupling constants are similar (4070 Hz for 1 J(Pt2,3-P1,3) and 4300 Hz for 1 J(Pt1-P2)) and are quite close to those found in the starting cluster [13].…”

Oxidative addition of Ph3SnH to Pt3(μ-CO)3(PR3)3 (R=PCy3, PtBu3)

“…NMR spectra appear as a superimposition of subspectra belonging to the isotopomers differing in the isotopic distribution of these nuclei. d and J values 1 involving Pt2,3 and the ligands bonded to these metal centres are similar to the corresponding values in the parent cluster [19], but large differences are observed in comparison to the corresponding values involving Pt1. This supports that the Pt1 metal centre is inserted into the Sn-H bond and that the P1 phosphine group is tipped out from the plane of the metal core.…”

Linked Metal-cluster Systems: Isolation and Characterisation of {anti-[(p-cymene)RuCl]-μ-[κ 2-P,P′;κ 1-P′′-(PPh2CH2)3CMe]-[AuPt3(CO)3(PCy3)3]}(PF6)2

“…The triphos resonance P A (see Scheme 2 for labelling) is observed as broad singlet at 29.4 ppm (w 1/2 143 Hz) at similar frequency to that in 2.PF 6 (28.7 ppm), whereas the triphos resonance P B is shifted to much higher frequency in comparison to 2.PF 6 (41.9 vs. 15.5 ppm) and is observed as a quartet with platinum satellites; confirming the symmetrical nature of gold binding to the cluster adduct. The tricyclohexylphosphine resonance P C is centred at 54.7 ppm, to lower frequency than that of the starting complex (69.8 ppm) [13] and is similar to related PR 3 Au-adducts of [Pt 3 (CO) 3 (PCy 3 ) 3 ] (52.2-58.1 ppm); the observed coupling constants are also in good agreement with these adducts [14]. Progressive cooling of the sample to -80°C results in the resolution of the P A resonance into a pair of doublets at 38.6 and 20.1 ppm with a 2 J PP coupling constant of 65 Hz, indicative of a fluxional process of the triphos ligand coordinated to the ruthenium(II) centre (Fig.…”

“…[1 week in CD 2 Cl 2 ). Exchange of the cluster moiety is observed in the presence of excess [Pt 3 ( 13 CO) 3 (PCy 3 ) 3 ] in THF at 60°C by 13 C NMR spectroscopy, although this process is negligible at RT in CD 2 Cl 2 .…”