Abstract
Five novel lanthanide−organic frameworks: [Ln(NTA)(H2O)2]·H2O (Ln = Eu (1)) and [Ln(NTA)(H2O)] (Ln = Tb (2), Ho (3, 4), and Tm (5); NTA = nitrilotriacetate anion) have been constructed by a rational synthetic strategy. 1 and 5 were successfully obtained by tuning the number of coordinated water molecules to lanthanide ions under different temperatures, while 2 and 3 were prepared under the same synthetic temperature as that of 5. Structural analyses indicate that they belong to three different space groups. 1 displays an irregular two-dimensional (2D) lattice consisting of alternative L- and R-type single-chain helixes, and both 2 and 3 are 2D double layer structures, while 4 and 5 are porous three-dimensional (3D) frameworks. Surprisingly, although 3 and 4 have identical molecular formulas, their structures exhibit significant differences originating from different pH values used in the synthesis. Interestingly, one-dimensional (1D) channels exist in the 3D frameworks of 4 and 5; each channel is fabricat...
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