Effect of coadsorbed CO2 on the magnetic properties of O2 confined in graphitic slit-shaped micropores

The magnetic susceptibility of coadsorbed O2 and CO2 confined in a slit-shaped graphitic micropore was measured over the temperature range 2–300 K. Coadsorbed CO2 markedly repressed the susceptibility of confined O2 because CO2 restricts the O2 molecular arrangement to form spin clusters. Curie–Weiss plots show that the coadsorbed CO2 reduced the effective spin concentration while the negative Weiss constant with CO2 was larger than that of pure O2. These results also indicate that the coadsorbed CO2 promotes the formation of smaller clusters of O2 molecules than for pure O2.