The crystal structures of all six pseudopolymorphs (Fig. ) were determined using Xray diffraction analysis at 100 K. The tetranuclear units of 1 in these crystals exhibit an identical distorted cubic structure. The ORTEP drawing of 1 in 1•0.5C6H6 is depicted in Fig. . The cubane framework is nearly identical to that of the previously reported tetraalkyl cubane-type complex (Fig. ) and shares similarities with the cubane-type cyanoborate-bridged complexes [Cr4{B(CN)4}4] 4- and [{Cr(CO)3(B(CN)4)}4]. The small internal void in 1, which limits its inclusion capacity, contrasts with the slightly larger voids in cubane-type cyanometallate complexes, such as [{Co(CN)3(Cp)}4{Rh(C5Me5)}4] and related cage complexes, which can accommodate alkali metal and ammonium ions. The N-Ru-N coordination angle in 1 is 85°, deviating from the ideal 90°, indicating a considerable distortion 1•C6H5Me, as observed in the TG section, is likely owing to the lower occupancy of benzene and its smaller volume, which allows it to fit more snugly between the cubane units (Fig. ). This is consistent with the observed shorter spacing between the cubane units. formation from [M(hfac)2]. The structure of the tetranuclear unit was nearly identical to those in the solvate crystals of 1, indicating a minimal effect of metal coordination. Both CPs accommodated hexane solvate molecules in the voids formed between the frameworks, which resulted from the linkage of bulky units. This structural feature suggests that they can be considered low-dimensional MOFs. MOFs with cage-type substructures are typically synthesized in a single step through self-assembly, while the present system illustrates a stepwise approach to their construction via the linkage of cage complexes.