Chemistry Letters, Vol.35, No.5, 504-505, 2006
Temperature-dependent penetration of argon molecules into ultramicroporous tunnel of a fluoroorganic molecular crystal with alteration of its unit cell size
A molecular crystal of octamethylene (S,S)-bis(2-hydroxy-3,3,3-trifluoropropanoate) with an ultramicroporous tunnel (phi = 2.5-2.8 angstrom) starts to adsorb argon (phi = 3.6 angstrom) at 150-140 K with 7% increase of the one direction of the orthorhombic unit cell. The alteration of the unit cell size indicates the penetration of argon into the tunnel and the soft nature of the microporous molecular crystal.