Reversible Phase Transformation and Luminescent Mechanochromism of ZnII‐Based Coordination Frameworks Containing a Dipyridylamide Ligand

It's all in the grinding: A 1D double-zigzag framework, {[Zn(paps)2(H2O)2](ClO4)2}n, was synthesized by the reaction of Zn(ClO4)2 with paps (see structure in scheme) in a layer method. A similar reaction, but in which dry solvents were used instead, led to the formation of a 2D polyrotaxane framework, [Zn(paps)2(ClO4)2]n. Both structures can be interconverted by heating and grinding in the presence of moisture and a remarkable luminescent mechanochromism in the transformation process is also observed by monitoring their luminescence images.