An isomorphous series of 10 microporous copper-based metal organic frameworks (MOFs) with the general formulas (3)(infinity)[{Cu-3(mu(3)-OH)(X)}(4){Cu-2(H2O)(2)}(3)(H-R-trz-ia)(12)] (R = H, CH3, Ph; X2- = SO42-, SeO42-, 2 NO32-(1-8)) and (3)(infinity)[{Cu-3(mu(3)-OH)(X)}(8){Cu-2(H2O)(2)}(6)(H-3py-trz-ia)(24)Cu-6]X-3 (R = 3py; X2- = SO42-, SeO42- (9, 10)) is presented together with the closely related compounds (3)(infinity)[Cu-6(mu(4)-O)(mu(3)-OH)(2)(H-Metrz-ia)(4)][Cu(H2O)(6)](NO3)(2)center dot 10H(2)O (11) and (3)(infinity)[Cu-2(H-3py-trz-ia)(2)(H2O)(3)] (12(Cu)), which are obtained under similar reaction conditions. The porosity of the series of cubic MOFs with twf-d topology reaches up to 66%. While the diameters of the spherical pores remain unaffected, adsorption measurements show that the pore volume can be fine-tuned by the substituents of the triazolyl isophthalate ligand and choice of the respective copper salt, that is, copper sulfate, selenate, or nitrate.