Mixed and partial oxidation states. Photoelectron spectroscopic evidence

Lester, Joseph E.

doi:10.1016/0009-2614(73)80351-3

Cited by 50 publications

(25 citation statements)

References 9 publications

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“…65,66 The obtained binding energies and areas for [{Pt(dmbpy)(μ-pz)} 2 ](BF 4 ) 2 are in good agreement with those previously reported for Pt(II) complexes. 64,65 However, these energies are 0.4 eV less than those for the major component of the intercalated ZrP material. On the other hand, typical Pt 4f binding energies for Pt(IV) complexes are between 2 and 3 eV greater than their Pt(II) analogues.…”

Section: ■ Results and Discussionsupporting

confidence: 88%

Luminescence Rigidochromism and Redox Chemistry of Pyrazolate-Bridged Binuclear Platinum(II) Diimine Complex Intercalated into Zirconium Phosphate Layers

et al. 2012

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The direct intercalation of a pyrazolate-bridged platinum(II) bipyridyl dimer ([{Pt(dmbpy)(μ-pz)}(2)](2+); dmbpy = 4,4'-dimethyl-2,2'-bipyridine, pz(-) = pyrazolate) within a zirconium phosphate (ZrP) framework has been accomplished. The physical and spectroscopic properties of [{Pt(dmbpy)(μ-pz)}(2)](2+) intercalated in ZrP were investigated by X-ray powder diffraction and X-ray photoelectron, infrared, absorption, and luminescence spectroscopies. Zirconium phosphate layers have a special microenvironment that is capable of supporting a variety of platinum oxidation states. Diffuse reflectance spectra from powders of the blue-gray intercalated materials show the formation of a low-energy band at 600 nm that is not present in the platinum dimer salt. The nonintercalated complex is nonemissive in room-temperature fluid solution, but gives rise to intense blue-green emission in a 4:1 ethanol/methanol 77 K frozen glassy solution. Powders and colloidal suspensions of [{Pt(dmbpy)(μ-pz)}(2)](2+)-exchanged ZrP materials exhibit intense emissions at room-temperature.

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Section: ■ Results and Discussionsupporting

confidence: 88%

Luminescence Rigidochromism and Redox Chemistry of Pyrazolate-Bridged Binuclear Platinum(II) Diimine Complex Intercalated into Zirconium Phosphate Layers

et al. 2012

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“…The intensity versus binding energy data obtained are shown in Figure 9. These values are in good agreement with the values reported in literature for platinum with zero oxidation state [36]. It has been reported that binding energy values of bulk Pt appear at 70.90 eV for 4f 7/2 and at 74.25 eV for 4f 5/2 electron [36].…”

Section: X-ray Photoelectron Spectroscopysupporting

confidence: 92%

Pt/zirconia catalyst for hydrogen generation from HI decomposition reaction of S-I cycle

Tyagi

Varma

Bharadwaj

2014

Int. J. Energy Res.

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Summary Hydrogen energy is considered as one of the ideal solutions for the fulfilment of the ever increasing energy demand. It is mainly due to the following two reasons: firstly, it can be produced from a very abundant source, that is, water; and secondly, it does not leave any harmful effect on the environment. Thermochemical cycles are amongst the most promising ways to generate hydrogen from water in an environment‐friendly manner. Sulfur–iodine cycle is one of the most efficient thermochemical cycles. In this paper, we discuss synthesis of Pt/zirconia catalysts for HI decomposition reaction, which is one of the important steps of S–I thermochemical cycle. The catalysts were characterized by X‐ray diffraction, scanning electron microscopy (SEM), field emission gun‐SEM, transmission electron microscopy, N2 adsorption and H2 chemisorption. The catalytic activity and stability of these catalysts, for liquid phase decomposition of hydriodic acid was evaluated. Conversion is found to be dependent on the noble metal loading, with 18.7% conversion for 2% Pt/ZrO2 catalyst as compared with 2.7% of without catalyst, although the specific activity is highest for 0.5% Pt/ZrO2 catalyst. The catalyst was found to be stable under liquid phase HI decomposition reaction conditions. Copyright © 2014 John Wiley & Sons, Ltd.

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“…The shoulder peaks are observed firstly at both 76.9 eV (Pt 4f 5/2 ) and 73.6 eV (Pt 4f 7/2 ) corresponding to Pt(bpy) 2 2+ , as have been reported by Frank et al 10) in a crystal state. It was also noted that the peaks arising from the zero-valent Pt are present at both 74.5 eV (Pt 4f 5/2 ) and 71.2 eV (Pt 4f 7/2 ), which is in good agreement with the Pt 0 foil 14) , showing that the zerovalent Pt 0 was formed from the Pt complex under the were also observed at both 77.6 eV and 74.0 eV. These peaks are assignable to some changed Pt complex with higher binding energy than Pt(bpy) 2…”

Section: Xps Studysupporting

confidence: 50%

An active catalyst system for proton reduction composed of a bipyridyl platinum complex and a polymer membrane

Abe

Takahashi

Shiraishi

et al. 2000

Macromol. Chem. Phys.

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Mixed and partial oxidation states. Photoelectron spectroscopic evidence

Cited by 50 publications

References 9 publications

Luminescence Rigidochromism and Redox Chemistry of Pyrazolate-Bridged Binuclear Platinum(II) Diimine Complex Intercalated into Zirconium Phosphate Layers

Luminescence Rigidochromism and Redox Chemistry of Pyrazolate-Bridged Binuclear Platinum(II) Diimine Complex Intercalated into Zirconium Phosphate Layers

Pt/zirconia catalyst for hydrogen generation from HI decomposition reaction of S-I cycle

An active catalyst system for proton reduction composed of a bipyridyl platinum complex and a polymer membrane

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