No abstract

The reduction of coordinated N2 to ammonia at atmospheric pressure and room temperature has been the subject of numerous studies. In all cases the reduction proceeds stoichiometrically, requires large quantities of reducing agents, or has to be initiated electrochemically. The photochemical reduction of N2 to NH3 at 1 atm N2 and 30 °C in aqueous solution in the presence of particles of the semiconductor system CdS/Pt/RuO2 (excitation by visible light) and of the anionic dinitrogen‐ruthenium(II) complex [Ru(Hedta)N2]⊖ as catalyst is now reported (Hedta = trianion of ethylenediaminetetraacetic acid).

Scanning tunneling microscopy has been used to study polycrystalline iron in borate buffer. The effect of oxidation and reduction processes on the electrode surface has been studied in situ. The initiation of oxide formation appears to start in the form of patches or clusters, which fuse together in time.

Scanning tunneling microscopy has been used to study polycrystalline aluminum and A1-Ta alloy in air and in NaC1 solution. In situ study of the modification of the surface due to A1 dissolution in the NaC1 solution shows that the roughing process is about 10 to 40% less for the A1-Ta alloy than for the A1 sample at a given time of immersion. By inductively coupled plasma analysis, it is found that the rate of dissolution of Al from the A1-Ta alloy is about 100 times slower than from the A1 sample for the first 30 h of immersion. The possibility of in situ studies of the topography of oxide films by

During the photolysis ofun aqueous solution of the Ru(Il)‐dinitrogen complex [Ru(HEDTA)(N3)]′ (I) in the presence of the photocatulytic CdS/Pt/ RuO2 particulate System at 505nm and 30°C in the presence of N3 (bubbling through solution), NH; is liberated.