【摘要】 <正> 自然界中某些光合细菌和某些藻类在光作用下具有固氮能力.特别是藻,它生长在水中,以空气中的氮气为氮源,水为氢源,光为能源,在常温、常压和光照下促进氮还原成氨.如能模拟光合固氮,不但有其理论意义,而且将有应用上的价值.我们考察了Co²⁺nbpy-Ru（bpy）₃²⁺-抗坏血酸体系的光助催化乙炔还原.最近Sutin等报道了该体系的放氢能力.更多还原

【Abstract】 The visible light induced catalytic reduction of acetylene to ethylene in Co2+.nbpy-Ru (bpy)32+-ascorbic acid system has been studied. It was found that this reaction was especially sensitive to pH of the solution, and could be carried out effectively at pH 3 to 5. The reaction products were affected by the mole ratio of Co2+ to bpy, when the mole ratio was 1:1 or 1:2, detectable amount of ethane was formed besides ethylene, and ethane was not detected when the mole ratio was equal to 1:0 or 1:3. Velocity of catalytic reduction of acetylene to ethylene was: Co2+.bpy> Co2+.2bpy >Co2+(aqua ion)> Co2+.3bpy.On the basis of equilibrium theory of coordination compound in aqueous solution, when mole ratio of Co2+ to bpy was 1:1, and pH=3.70, calculatec results showed that the most active species of catalytic reduction of C2H2 to C2H4 would be Co (bpy)2+.In this paper, photo-induced single electron transfer mechanism, in which the induced catalytic reaction could be realized by orbital overlapping and symmetry adaptation, was discussed. A possible model of the catalytic reduction of C2H2 was proposed(see p. 99).更多还原