Xiao-Ping Zhou,^⊥ Yuan Wu,^⊥ and Dan Li*

Abstract: A series of neutral cubic nickel(II)- imidazolate Ni₈L₁₂X₄ cages were prepared by rational choices of substituents and anions with solvothermal subcomponent self-assembly technology. Both substituents and halide anions play a critical role in the formation and stabilization of cubic cages. Changing one of the factors in the reaction will switch the final structure to a Ni₁₄L₂₄ rhombic dodecahedral cage. The cubic cage can transform to a large rhombic dodecahedral cage in the presence of methylamine at room temperature accompanied by a color change from purple to light yellow.

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