New Fused Quinoxalines : Synthesis and Reactions of Pyrimidothienoquinoxaline and Oxadizolylthienoquinoxalines

摘要

Copper complexes have been directly incorporated into cellulose acetate (CA) and the resulting light blue colored homogeneous films of 5-20 wt.% copper acetate complex concentrations are found to be thermally stable up to 200 ∩. The reaction chemistry of Cu in CA has been investigated by reacting them with small gas molecules such as CO, H₂, D₂, O₂, NO, and olefins in the temperature range of 25-160 ∩, and various Cu-hydride, -carbonyl, -nitrosyl, and olefin species coordinated to Cu sites in CA are characterized by IR and UV/Vis spectroscopic study. The reduction of Cu(ケ) complexes by reacting with H₂ gas at the described conditions results in the formation of Cu₂O and copper metal nanoparticles in CA, and their sizes in 30-120 nm range are found to be controlled by adjusting metal complex concentration in CA and/or the reduction reaction conditions. These small copper metal particles show various catalytic reactivity in hydrogenation of olefins and CH₃CN; CO oxidation; and NO reduction reactions under relatively mild conditions.