A metal-organic macrocycle (MOM), [(Cu-2)(3)L-6(DMF)(2)(H2O)(4)], was prepared using a long and "pseudo-rigid" dicarboxylic acid, 1,4-bis(3-carboxylphenylethynyl) benzene (H2L), with some rotational flexibility, where the MOM has a double-walled triangular geometry with three Cu paddle-wheel secondary building units (SBUs) doubly connected by the ligands in a cis-conformation.