A Dynamic Crystal‐to‐Amorphous Transformation Microporous Zn II Mixed Neutral‐ligand Metal‐organic Polymer {[Zn(bpp) 2 (μ‐4,4′‐bipy)(H 2 O) 2 ](ClO 4 ) 2 ·H 2 O} n

A new rarely reported Zn II mixed‐polypyridine coordination polymer with both rigid and flexible spacers, {[Zn(bpp) 2 (μ‐4,4′‐bipy)(H 2 O) 2 ](ClO 4 ) 2 · H 2 O} n ( 1 ), has been synthesized and characterized by elemental analysis, IR‐, 1 H NMR‐, 13 C NMR spectroscopy and single‐crystal X‐ray diffraction. The thermal stability of compound 1 was studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The single‐crystal X‐ray structure of 1 shows that the complex has been formed from a 1D polymer as a result of bridging by the 4,4′‐bipy ligands. Solution and solid‐state luminescent spectra of the compound 1 indicate intense fluorescent emissions at ca. 353.6 and 468.8 nm, respectively. Removal of the interstitial water guest molecules results in a loss of crystallinity, but exposure to water vapor reestablishes the original structure, thus constituting 1 as a third‐generation porous framework.