Enhanced stabilization and deposition of Pt nanocrystals on carbon by dumbbell-like polyethyleniminated poly(oxypropylene)diamine

Article Abstract:

Pseudo-dendritic polyethyleniminated poly(oxypropylene)diamine (D400[EI.sub.20]) is used as a stabilizer and promoter to prepare Pt nanoparticles in aqueous solution, which is then deposited on carbon surface followed by calcination. The increasing time of thermal treatment increases the crystallinity of Pt(0) on carbon, accompanied by the increased electrochemical active surface (EAS) areas, which corresponds to its enhanced electrocatalytic performance to methanol oxidation.

Platinum compounds

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Thiyl radical interaction with pyrimides C5-C6 double bond

Article Abstract:

Pulse radiolysis technique in aqueous solution was used for examining the addition and elimination interaction of thiyl radicals with the C5-C6 double bond in pyrimidines. The addition of the aliphatic thiyl radicals to the pyrimidine C5-C6 double bond occurs at k = 1.0 - 3.0 X 10(super7) dm(super 3) mol(super -1) s(super -1) while elimination occurs with k = 0.7 - 2.0 * 10(super 5) s(super -1).

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Repair reactions of pyrimidine-derived radicals by aliphatic thiols

Article Abstract:

Pyrimidinyl radicals of various structures are generated in aqueous and alcohol-containing solutions by means of pulse radiolysis. Results reveal that larger the energy gap, the smaller the interaction of the pyrimidinyl radicals with the thiols, and this leads to a lower pair rate constant.

Radiolysis

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