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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).

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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.