| Abstract
| - Molecules and atoms confined in a nanospace may have properties distinctly different from those of the bulkfluid, owing to the formation of a specific molecular array characteristic of nanospace. In situ synchrotronpowder X-ray diffraction measurements have been used to observe confined guest molecules such as N2, O2,Ar, and CH4 in the well-regulated ultramicropore of a copper coordination polymer, 1 ([Cu2(pzdc)2pyz]: pzdc = 2,3-pyrazinedicarboxylate and pyz = pyrazine). The obtained crystal structures indicate that guestmolecules are confined in a linear fashion to form crystalline-like regular ordered arrays, in contrast to thesituation in the gas and liquid state, even at temperatures above the boiling point, and the ordered arrays arecharacteristic of the kind of gas molecule and the geometrical and potential properties of the ultramicroporeof 1.
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