1,721,025 research outputs found
1H bridging and terminal hydride T1 values. Comments on classical vs non classical hydride identification using T1 criteria.
No full textHydride 1H T1 values are reported for a selected series of ruthenium, iridium and platinum complexes. These T1 values range from 6.9 to 0.05 s with the shortest value, 0.05 s, assigned to a complex containing both hydride and coordinated molecular hydrogen, i.e. “M(H2)”. There are nuclear Overhauser enhancements arising both from protons on coordinated ligands and other hydride ligands. It is suggested that the molecular weight of the complex and the measurement conditions can be important factors for T1
Synthesis and Characterization of Pd(II) and Pt(II) Complexes of Dibenzyl Disulfide and Dibenzyl Diselenide. The X-Ray Structure of cis-[PtCl2(PMe2Ph)]2(Se2Bz2)
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Synthesis and characterization of palladium(II) and platinum(II) complexes of dibenzyl disulfide and dibenzyl diselenide. X-ray structure of cis-[PtCl2(PMe2Ph)]2(Se2Bz2)
No full textStructural and 13C NMR Studies on Palladium MOP Compounds: A New Weak C-Pd -Bond Plus MOP as a Bridging Diene Ligand
No full textA new set of Pd-MOP complexes (MOP = (S)-2-diarylphosphino-1,1′-binaphthyl) has been prepared. One of these, containing MeO-MOP (=2-(diphenylphosphino)-2′-methoxy-1,1′-binaphthyl), is shown to act as a chelating ligand with a naphthyl backbone diene bridging a Pd(I)-Pd(I) bond. This bonding mode exists in both the solid and solution states. A series of chloro-Pd(II)MOP complexes containing the well-known cyclometalated N,N- dimethyl benzylamine chelate have been treated with NaBArF to extract the chloride ligand. The products, starting from the H-MOP, MeO-MOP, and NC-MOP analogues, are all different. Of particular interest is the product from the H-MOP reaction in that the fourth coordination position is occupied by a weak Pd-C a-bond from the naphthyl backbone, on the basis of 13C NMR data. The rate of product formation in the Pd-catalyzed hydrosilylation of styrene with SiHCl3 has been measured as a function of time for the four auxiliaries H-MOP, MeO-MOP, HO-MOP, and NC-MOP. The NC-MOP is shown to be much faster than the others, and a tentative explanation is offered
Reactions of Ru(Cp*) Complexes with P(o-tolyl)3
No full textReaction of [Ru(Cp*)(CH3CN)3](PF6) with P(o-tolyl)3 affords [Ru(Cp*){(eta 6-o-tolyl)P(o-tolyl)2}](PF6) (4) in which the P-atom is not
coordinated to the metal. The solid-state structure of 4 has been determined. A related reaction with P(p-tolyl)3 reveals a small quantity
[Ru(Cp*){(eta 6-p-tolyl)P(o-tolyl)2}](PF6), in solution, but mostly the expected bis-phosphine complex. Reaction of the Ru(IV) dication,
[Ru(Cp*)(eta 3-PhCHCHCH2)(DMF)2](PF6)2, with P(o-tolyl)3 gives a mixture of the phosphonium salt, C6H5CH=CHCH2P(o-tolyl)3
(9) and the dication [Ru(Cp*)(eta 6-C6H5CH=CHCH2P(o-tolyl)3)](PF6)2 (10). Salt 9 forms via attack of the P-atom on the allyl ligand.
The latter product results from complexation of 9 via the phenyl group of the former allyl ligand. It would seem that the sterically
demanding P(o-tolyl)3 ligand is not readily compatible with the Ru(Cp*) fragment, in either the +2 or +4 oxidation state. Detailed
NMR studies are reported
Preparative and 1H NMR Spectroscopic Studies on Palladium(II) and Platinum(II) Quinoline-8-carbaldehyde (1) Complexes. X-Ray Structures of the Cyclometalated Acyl Complex PdCl(C(O)C9H6N)(PPh3)PPh3 and trans-PtCl2(1)(PEt3)
No full textMultinuclear NMR studies of [Pt(alkyl)(PR3)3]+ complexes
No full textMultinuclear NMR studies of [Pt(alkyl)(PR3)3]+ complexes
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