“…The formulae of MUF-7 and MUF-77 are the same, [Zn 4 O(hmtt) 4/3 (bpdc) 1/2 (bdc) 1/2 ], but they are topological isomers of one another and differ subtly in the arrangement of the constituent ligands (Figure B,C). They can be distinguished crystallographically: while both are cubic, MUF-7 has a unit cell parameter around 60 Å and belongs to the I -43 d space group, while MUF-77 has a unit cell parameter around 30 Å and belongs to the Pm -3 space group. ,,, In their powder X-ray diffraction (PXRD) patterns, MUF-7 has a shoulder at 2θ = 3.5° and a peak at 5.5°, while MUF-77 has a peak at 2θ = 3.0°, 5.1°, and 6.1° (Cu α radiation). It is important to note that for this work, the substituents on the bdc linker determined whether the MUF-7 or MUF-77 topology is produced.…”