Stereochemical Nonrigidity in a Chelated Platinum(0)-Diolefin Complex

Synthesis and Photoisomerization of Divinyltetramethyldisiloxane and Divinyltetramethyldisilazane Complexes of (η5-C5R5)Rh (R = H, Me). Crystal and Molecular Structure of (η5-C5Me5)Rh[η4-(CH2CH)Me2SiOSiMe2(CHCH2)]

“…The fluxional behavior of ( t Bu 3 P)Pt[η 4 -(CH 2 CHSiMe 2 ) 2 O] manifests itself in Si Me 2 signal broadening in the 1 H and 13 C{ 1 H} NMR spectra . We acquired the 1 H NMR spectra of 1a between 294 and 343 K, but no Si Me 2 signal broadening was observed.…”

Second generation N-heterocyclic carbene–Pt(0) complexes as efficient catalysts for the hydrosilylation of alkenes

“…The bidentate dvtms ligand exists in a pseudochair conformation which is a common coordination mode for this ligand. [15][16][17][18] This complex owes its chirality to the fact that the C 2 symmetry of the carbene ligand is broken by the pseudochair conformation adopted by the dvtms ligand. The benzimidazole carbene is tilted by 68u (C20-Pt1-C1-N9 torsion angle) from the plane formed by the Pt centre and the alkene ligands.…”

Ylide-Functionalized Phosphine (YPhos) Platinum Complexes: Synthesis and Application in Hydrosilylations under Mild Conditions

“…Evidence of a direct P−Pt bond was observed in the corresponding 31 P{ 1 H} NMR spectra showing singlets with Pt satellites with large 1 J PPt coupling constants between 3351 and 3622 Hz (Table 1), which are comparable to other phosphine platinum complexes. 21,22 In the molecular structures (Figure 2), the P−Pt distances range between 2.339(2) and 2.3964(8) Å and are thus on the longer end of values reported for analogous phosphine platinum complexes such as (tBu 3 P)Pt(vs) (2.384(2) Å) or ((pTol) 3 P)Pt(vs) (2.292(2) Å). 10,23 Since there is no clear trend between the electronic properties [as measured by their Tolman electronic parameter (TEP), Table 1] of the ligands and the Pt−P distance, we assume that this is mostly due to steric reasons connected with the bulk of the YPhos ligands.…”