A Cu complex-assembled compound [Cu(bpy)(BF4)(2)(H2O)(2) . (bpy)](n) (bpy = 4,4'-bipyridine) with non-interpenetrated structure was synthesized and its adsorption properties for N-2, Ar, and CO2 were studied. The adsorption of gas on this complex suddenly begins at a definite relative pressure ('gate pressure') regardless of almost nil adsorption below the gate pressure. Such a unique adsorption phenomenon is attributed to the hydrogen bond-regulated microporous nature of this complex; hydrogen bonds in pores block adsorption below the gate pressure. Additionally, the gate pressure depends on both the adsorbate and the pretreatment temperature of the Cu complex solid.