Kinetics of nickel, palladium and platinum complexes

Peloso, A.

doi:10.1016/s0010-8545(00)80233-7

Cited by 69 publications

(36 citation statements)

References 228 publications

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“…This observation is consistent with a mechanism where hydroxide reacts at the metal first and follows the common trend that ligand substitution reactions are slower for Pt than Pd. [70][71][72] Increasing the temperature of the reaction to 60 °C gave complete conversion of 11 to a mixture of products, but we were unable to isolate a pure compound from this reaction.…”

Section: Methodsmentioning

confidence: 95%

N-heterocyclic carbene tethered amido complexes of palladium and platinum

et al. 2011

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Graphical Contents EntryThe synthesis and structure of chelating amido-NHC and amido-bis(NHC) complexes of Pd and Pt are described, including the first [CNC]Pt complexes and the first Pd arylamido-NHC complex. AbstractWith a view to applications in bifunctional catalysis, a modular cross-coupling strategy has been used to prepare amine bis(imidazolium) salts (3a and 3b) and an amine mono(imidazolium) salt (6) inert Pt analogue 11 was unreactive under the same conditions. Solid-state structures of the complexes 7a, 7b, 9a, 10, 11 and 12 have been determined by single crystal X-ray diffraction.

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Section: Methodsmentioning

confidence: 95%

N-heterocyclic carbene tethered amido complexes of palladium and platinum

et al. 2011

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“…2ϩ with 0.5 m thiourea was followed over a spectral range from 250 to 370 nm for 10 s and a Global [Pt(phen)(OH 2 )tu] 2ϩ (calculated using the Global Analysis software) and [Pt(phen)(tu) 2 ] 2ϩ are shown in Figure 6. The spectral changes do not show very characteristic features, since the bands observed are due to intraligand π-π * transitions of the phen ligand.…”

Section: The Equilibrium Between [Pt(phen)(oh 2 ) 2 ]mentioning

confidence: 99%

“…For the determination of the exact rate constants the kinetics were followed at a single wavelength, 260 nm, using complex concentrations of 2.5 ϫ 10 Ϫ5 and 1.0 ϫ 10 Ϫ5  for the temperature and concentration dependence, respectively. Each k obs value reported is the mean value of at least [Pt(ЈN 2 Ј)(OH 2 ) 2 ] 2ϩ to the phen complex. Even at pH 2, the formation of a precipitate was observed, which was yellow five measurements.…”

Section: The Equilibrium Between [Pt(phen)(oh 2 ) 2 ]mentioning

confidence: 99%

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Specific Chelate Tuning of the Substitution Kinetics of Platinum(II) Complexes in Aqueous Solution

Fekl

Eldik²

1998

Eur. J. Inorg. Chem.

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“…Reaction mechanisms of platinum(1V) complexes have recently been reviewed (1,2). One that is of particular importance for halide interchange reactions of anionic complexes is reductive elimination followed by oxidative addition (r.e.0.a.).…”

Section: O N Reexamine Les Etapes Successives De La Reaction Du Complmentioning

confidence: 99%

Redox Interchange Reactions of Halogenoplatinum(IV) Complexes. pH Dependence of the Hexabromoplatinate(IV)–Iodide Reactions

Johnson¹,

Poë²

1974

Can. J. Chem.

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Reaction mechanisms of platinum(1V) complexes have recently been reviewed (1, 2). One that is of particular importance for halide interchange reactions of anionic complexes is reductive elimination followed by oxidative addition (r.e.0.a.). Proposed originally by Grinberg and co-worker (3) it has recently been confirmed and elaborated (4). This mechanism is believed to operate in the reaction of [~t~r , ]~-with iodide to form [PtI,, a reaction that proceeds in three kinetically distinct stages, each of which was proposed to be of the form shown in reaction 1 where the four ligands in the plane perpen-very fast dicular to the page (omitted for simplicity) were Br,, trans-Br,I,, and I, in the first, second, and third stages, respectively. This conclusion was based in part on the observation that the second and third stages were also detected after the very rapid oxidation of [PtBr,12-by I,--I-mixtures. However, a study of the p H dependence of the reactions has shown that Stages I1 and I11 are more complicated than this, each consisting of at least two parallel reactions, but that no change is necessary in the basic type of mechanism proposed. Experimental and ResultsSodium hexabromoplatinate(1V) hexahydrate, sodium hexachloroiridate(IV), and potassium tetrabromoplatinate(I1) (Johnson, Mathey and Mallory, Ltd.) were used as received. The kinetics were followed in the same way as before (5), reacting solutions being contained in tightly stoppered cells in the thermostatted cell holder of a Perkin-Elmer 402 or Cary 16K recording spectrophotometer and the changing absorbance at a fixed wavelength being followed automatically. The temperatures of the solutions were measured directly with a calibrated thermistor and Wheatstone Bridge, and were constant to within 1 0 . 0 5 "C throughout the period of the reactions. The ionic strengths of the solutions were controlled by addition of sodium perchlorate and their p H values were adjusted with standard perchloric acid solutions, the values being measured with an Instrumental Laboratory, Model 205, p H meter. Stage IThe kinetics were followed in the presence of a pseudo-first-order excess of iodide by observing the growth in absorbance at 430 nm which is ' T o whom all correspondence should be addressed.close to an isosbestic point for Stage 11. IsosCan. J. Chem. Downloaded from www.nrcresearchpress.com by 54.245.13.81 on 05/12/18For personal use only.

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Kinetics of nickel, palladium and platinum complexes

Cited by 69 publications

References 228 publications

N-heterocyclic carbene tethered amido complexes of palladium and platinum

N-heterocyclic carbene tethered amido complexes of palladium and platinum

Specific Chelate Tuning of the Substitution Kinetics of Platinum(II) Complexes in Aqueous Solution

Redox Interchange Reactions of Halogenoplatinum(IV) Complexes. pH Dependence of the Hexabromoplatinate(IV)–Iodide Reactions

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