A two-dimensional photoreactive coordination polymer (2D CP), [Zn₂(Fumarate)₂(H₂O)₂(2F-spy)₄] (1) (2F-spy = 2′-fluoro-4-styrylpyridine), undergoes partial [2 + 2] cycloaddition reaction under UV light in a single-crystal-to-single-crystal manner to a three-dimensional (3D) CP [Zn₂(Fumarate)₂(H₂O)₂(2F-spy)₃(rctt-2F-ppcb)_0.5] (2) (where rctt-2F-ppcb = 1,3-bis(4′-pyridyl)-2,4-bis(2′-fluoro-phenyl)cyclobutane), whereas another similar photoreactive 2D CP, [Zn₂(Fumarate)₂(3F-spy)₂] (3) (3F-spy = 3′-fluoro-4-styrylpyridine), when exposed to UV light, forms a cyclobutane ring arising from the hetero-cross-coupling of 3F-spy and fumarate, in addition to the expected cyclobutane ring, rctt-3F-ppcb (rctt-3F-ppcb = 1,3-bis(4′-pyridyl)-2,4-bis(3′-fluoro-phenyl)cyclobutane) by the [2 + 2] cycloaddition reaction of 3F-spy pairs aligned in a head-to-tail (HT) fashion. It is unusual to observe two different photoproducts in a solid-state [2 + 2] photo-cycloaddition reaction involving CPs. It is possible because the metal ions appear to support the reactions between two different types of ligands.

中文翻译：

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两种二维Zn（II）配位聚合物的对比固态光反应性

二维光反应性配位聚合物（2D CP），[Zn ₂（富马酸酯）₂（H ₂ O）₂（2F-spy）₄ ]（1）（2F-spy = 2'-氟-4-苯乙烯基吡啶），在紫外光下以单晶对单晶的方式经历部分[2 + 2]环加成反应，生成三维（3D）CP [Zn ₂（富马酸酯）₂（H ₂ O）₂（2F-spy） ）₃（rctt -2F-ppcb）_0.5 ]（2）（其中rctt-2F-ppcb = 1,3-双（4'-吡啶基）-2,4-双（2'-氟-苯基）环丁烷），而另一种类似的光反应性2D CP [Zn ₂（Fumarate）₂（3F- spy）₂ ]（3）（3F-spy = 3'-fluoro-4-styrylpyridine），当暴露于紫外线下时，除了3F-spy和富马酸酯的异质交叉偶联外，还会形成环丁烷环预期的环丁烷环rctt -3F-ppcb（rctt-3F-ppcb = 1,3-双（4'-吡啶基）-2,4-双（3'-氟-苯基）环丁烷），通过排列在头部的3F-spy对的[2 + 2]环加成反应到尾（HT）的时尚。在涉及CP的固态[2 + 2]光环加成反应中观察到两种不同的光产物是不寻常的。这是可能的，因为金属离子似乎支持两种不同类型的配体之间的反应。