Abstract
Adsorption isotherms on graphite of CO 2, N 2O and C 2N 2 disclose three 2D phases: gas, liquid and solid. However for C 2N 2, the results are also consistent with a single fluid-solid coexistence domain. The cohesion energy of the 2D solid monolayer is strikingly higher for C 2N 2 than for CO 2 and N 2O. This we trace back to a particularity of the shape of the C 2N 2 molecule, which makes possible a more energetic 2D solid structure. For CO 2 and N 2O a strong hysteresis is associated with the 2D liquid-solid transition.
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