The formation and crystal structure of a hydrated molecular salt that results in a square network is reported. The crystalline solid is based upon the tetraprotonated photoproduct rtct-tetrakis(pyridin-4-yl)cyclobutane (4H-rtct-TPCB)⁴⁺ along with two sulfate anions (SO₄²⁻) and eight waters of hydration, namely, 4,4′,4′′,4′′′-(cyclobutane-1,2,3,4-tetrayl)tetrapyridinium bis(sulfate) octahydrate, C₂₄H₂₄N₄⁴⁺·2SO₄²⁻·8H₂O. The fully protonated photoproduct acts as a four-connecting node within the square network by engaging in four charge-assisted N⁺—H…O hydrogen bonds to the sulfate anion. The observed hydrogen-bonding pattern in this square network is akin to T-silica, which is a metastable form of SiO₂. The included water molecules and sulfate anions engage in numerous O—H…O hydrogen bonds to form various hydrogen-bonded ring structures.

中文翻译：

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基于四质子化光产物 rtct-四（吡啶-4-基）环丁烷和硫酸根阴离子的分子盐的方形网络

报告了导致方形网络的水合分子盐的形成和晶体结构。结晶固体基于四质子化光产物 rtct -四(吡啶-4-基)环丁烷 ( 4H- rtct -TPCB ) ⁴⁺以及两个硫酸根阴离子 (SO ₄ ^2- ) 和八个水合水，即 4， 4',4'',4'''-(环丁烷-1,2,3,4-四基)四吡啶鎓双(硫酸盐)八水合物，C ₂₄ H ₂₄ N ₄ ⁴⁺ ·2SO ₄ ^2- ·8H ₂O. 完全质子化的光产物通过与硫酸根阴离子形成四个电荷辅助的 N ⁺ -H…O 氢键，充当方形网络内的四个连接节点。在这个方形网络中观察到的氢键模式类似于 T-二氧化硅，它是 SiO ₂的亚稳态形式。包含的水分子和硫酸根阴离子参与众多的 O-H…O 氢键，形成各种氢键环结构。