A large [Mn10Na](4) loop-of-loops aggregate was prepared from the use of 1,3-propanediol (pdH(2)) in manganese carboxylate chemistry. It is constructed from four [Mn-10(mu(3)-O)(2)(O2CMe)(13)(pd)(6)(py)(2)](-) loops linked through Na+ ions and exhibits a saddlelike topology. Magnetic characterization showed that the Mn-10 loop has an S similar to 4 ground-state spin and displays frequency-dependent in-phase and out-of-phase alternating current signals and also hysteresis loops that, however, are not typical of single-molecule magnets because of the existence of intermolecular interactions between the Mn-10 units.