The presence of butanoic acid excess in the reaction media employed for the synthesis of a MOF with formula [Cu2(μ3-ade)2(μ2-OOC(CH2)2CH3)2]n (ade: adeninate) leads to the formation of micelles that exert a template effect and provide a pronounced increase of its microporosity, doubling the intrinsic adsorption capacity of the pristine crystal network.