The structure of PdO

Waser, Jürg; Levy, H. A.; Peterson, S. W.

doi:10.1107/s0365110x53001800

Cited by 133 publications

(88 citation statements)

References 2 publications

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“…44,51 However, the distances for the mainly amorphous platinum(II) oxide used in the present study and the hydrolyzed platinum(II) species are in very good agreement, cf. Table 2.…”

Section: Dalton Transactions Papersupporting

confidence: 51%

“…The number of M-O bond distances is equal to four, strongly indicating that the terminal palladium(II) and platinum(II) ions in the hydrolysis products bind water molecules, hydroxide or oxide groups at the same distances as observed in the solid oxides 44,[49][50][51] and the hydrated ions, 21,27,28 in order to complete a square-planar coordination geometry. These observations strongly indicate that the hydrolyzed palladium(II) and platinum(II) species are present as well defined small clusters or polynuclear complexes, with the same core structure as the solid oxides.…”

Section: Resultsmentioning

confidence: 99%

“…44,[49][50][51] Another three palladium(II) oxide structures have been reported. However, one of these was recorded at high pressure, and another as a supported film.…”

Section: Resultsmentioning

confidence: 99%

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Structures of polynuclear complexes of palladium(ii) and platinum(ii) formed by slow hydrolysis in acidic aqueous solution

et al. 2013

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The aqua ions of palladium(II) and platinum(II) undergo extremely slow hydrolysis in strongly acidic aqueous solution, resulting in polynuclear complexes. The size and structures of these species have been determined by EXAFS and small angle X-ray scattering, SAXS. For palladium(II), the EXAFS data show that the Pd-O and Pd⋯Pd distances are identical to those of crystalline palladium(II) oxide, but the intensities of the Pd⋯Pd distances in the Fourier transform at 3.04 and 3.42 Å are significantly lower compared to those of crystalline PdO. Furthermore, no Pd⋯Pd distances beyond 4 Å are observed. These observations strongly indicate that the polynuclear palladium(II) complexes are oxido-and hydroxido-bridged species with the same core structure as solid palladium(II) oxide. Based on the number of Pd⋯Pd distances, as derived from the EXAFS data, their size can be estimated to be approximately two unit cells, or ca. show Pt-O and Pt⋯Pt distances identical to those of amorphous platinum(II) oxide, precipitating from the solution studied. The Pt⋯Pt distances are somewhat different from those reported for crystalline platinum(II) oxide. The polynuclear platinum(II) complexes have a similar structure to the palladium ones, but they are somewhat larger, with an estimated diameter of 1.5-3.0 nm. It has not been possible to precipitate any of these species by ultracentrifugation. They are detectable by SAXS, indicating diameters between 0.7 and 2 nm, in excellent agreement with the EXAFS observations. The number of oxido-relative to hydroxido bridges will increase with increasing size of the complex. The charge of the complexes will remain about the same, +4, at growth, with approximate formulas [Pd 10 O 4 (OH) 8 for complexes with a size of 2 and 3 unit cells of the corresponding solid metal oxide, respectively. Their high ionic charge in acidic aqueous solution will result in a stabilizing hydration shell.

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“…44,51 However, the distances for the mainly amorphous platinum(II) oxide used in the present study and the hydrolyzed platinum(II) species are in very good agreement, cf. Table 2.…”

Section: Dalton Transactions Papersupporting

confidence: 51%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Structures of polynuclear complexes of palladium(ii) and platinum(ii) formed by slow hydrolysis in acidic aqueous solution

et al. 2013

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“…1 and Table 1. The crystallographic Pd-O and Pd-Pd distances given in the table were derived from literature data, which refer to room temperature ( [19], PdO: P4 2 /mmc; a = 3.03 ± 0.01; c = 5.33 ± 0.02; Table 1 Comparison of model parameters derived from the EXAFS spectrum of PdO shown in Fig. 1 with crystallographic data [9] Bond (6) 3.419 7.9 (9) 8 3.9 (7) The standard errors in the last digit are given in parentheses.…”

Section: Exafsmentioning

confidence: 99%

Heterogenized palladium chitosan complexes as potential catalysts in oxidation reactions: study of the structure

Kramareva

Stakheev

Ткаченко

et al. 2004

Journal of Molecular Catalysis A: Chemical

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“…For example, the lattice constant of palladium increased from 0.388 nm to 0.393 nm during the measurement, as estimated from the Bragg-position of the 1 1 1 reflection of palladium (Pd (1 1 1)). Above 450 • C, a diffraction peak was observed around 2Â = 33.7 • , which was assignable to tetragonal palladium oxide (t-PdO) with the space group of P4 2 /mmc and lattice parameters of a = 0.304 nm and c = 0.533 nm [20]. Above 600 • C, diffraction peaks assignable to t-PdO were observed around 2Â = 33.4 • and 41.7 • .…”

Section: In Situ High-temperature Xrd Analysismentioning

confidence: 95%

In situ high-temperature X-ray diffraction study of thin palladium/α-alumina composite membranes and their hydrogen permeation properties

Okazaki

Ikeda

Tanaka

et al. 2009

Journal of Membrane Science

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The structure of PdO

Cited by 133 publications

References 2 publications

Structures of polynuclear complexes of palladium(ii) and platinum(ii) formed by slow hydrolysis in acidic aqueous solution

Structures of polynuclear complexes of palladium(ii) and platinum(ii) formed by slow hydrolysis in acidic aqueous solution

Heterogenized palladium chitosan complexes as potential catalysts in oxidation reactions: study of the structure

In situ high-temperature X-ray diffraction study of thin palladium/α-alumina composite membranes and their hydrogen permeation properties

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