Response to the Temperature and Solvent Stimulation of MOF Material in a Single-Crystal to Single-Crystal Manner

Under solvothermal conditions, a three-dimensional mononuclear crystal AQNU-1, {[Co(H₂L)(DPD)(H₂O)₂]·2DMA}_n (H₂L = 5-(bis(4-carboxybenzyl)amino)isophthalic acid, DPD = 4,4'-(2,5-diethoxy-1,4-phenylene)dipyridine) has been synthesized. The transformations of AQNU-1 to binuclear {[Co₂(L)(DPD)_1.5(H₂O)₃]·DMA·H₂O}_n (AQNU-2) and pentanuclear {[Co₅(L)₂(DPD)₂(OH)₂]·2H₂O}_n (AQNU-3) were realized by double stimulation of temperature and solvent, which were accomplished by single-crystal to single-crystal (SC-SC) reaction.