Structures of Zn2(dobpdc) and toluene-solvated, diamine-appended variants, as determined by single-crystal X-ray diffraction at 100 K. Left: A portion of the crystal structure of Zn2(dobpdc)(DMA)2 as viewed along the c axis (N,N-dimethylacetamide molecules have been excluded for clarity). Right: First coordination spheres for the ZnII centers in a series of diamine-appended frameworks examined in this work. Structures were refined as inversion twins in either space group P3121 or P3221, and the diamines were found to be disordered over a minimum of two positions. For clarity, only the dominant conformation is depicted in space group P3221. Light blue, blue, red, gray, and white spheres represent Zn, N, O, C, and H atoms, respectively.