Guest-induced single-crystal-to-single-crystal transformations of a new 4-connected 3D cadmium(II) metal–organic framework

The hydrothermal reaction of a Cd(II) salt with 4-(pyridin-4-yl)-isophthalic acid (H2pic) yields a new uninodal 4-connected 3D metal–organic framework [Cd(pic)(H2O)]·H2O (1) with the Schlafli symbol of (4·65). 1 and [Cd(pic)] (1a) could undergo single-crystal-to-single-crystal transformation (SC–SC) via reversible dehydration and rehydration.