Molecular Tectonics: Control of Reversible Water Release in Porous Charge-Assisted H-Bonded Networks

The combinations of bisamidium dicationic tectons 1-2H+ and 2-2H+ bearing two OH groups as additional H-bond donor/acceptor sites with [M(CN)6]3−2 (M = Fe, Co, Cr) anions lead to the formation of robust porous crystals (decomposition temperature in the range of 240−300 °C) offering channels occupied by water molecules. The release and uptake of solvent molecules takes place through a reversible single crystal-to-single crystal transformation. Importantly, the temperature of dehydration can be increased by ca 40 °C through the decoration of the channels by introduction of OH groups on the backbone of the organic tecton.

带有两个羟基（OH）基团作为额外氢键给体/受体位点的双酰胺鎓双阳离子构造基元（bisamidium dicationic tectons）1-2H+与2-2H+，与六氰合金属阴离子[M(CN)₆]³⁻（M=Fe、Co、Cr）结合，可形成稳定多孔晶体（分解温度区间为240~300℃），该晶体拥有被水分子占据的孔道。溶剂分子的脱除与吸附可通过可逆的单晶-单晶转变实现。值得注意的是，通过在有机构造基元的骨架上引入羟基基团对孔道进行修饰，可将脱水温度提升约40℃。