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Crystal Photodimerization Reactions of Spatially Engineered Isocoumarin Assemblies

机译:空间工程异香豆素组装体的晶体光二聚化反应

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摘要

We report the single-crystal-to-single-crystal (SCSC) photodimerization of a sulfonamide isocoumarin. When recrystallized, this material forms centrosymmetrically related supramolecular dimers that assemble via the complementary features of molecular shape and carboxyl center dot center dot center dot carboxyl contacts. This prescribed motif persists despite the presence of two-part whole-molecule disorder. Each disorder component is involved in a unique set of hydrogen-bonding interactions, N-H center dot center dot center dot O=C versus N-H center dot center dot center dot O=S, that propagate along the [111] and [110] directions of the crystal, respectively. Despite the observed disorder, the overall recognition profile of this supramolecular dimer remained intact, effectively promoting coplanar head-to-tail alignment with a separation of 3.4-4.1 angstrom between the neighboring C=C groups. UV illumination studies using the tail-irradiation technique produced a single photodimer product in quantitative yield via a SCSC transformation.
机译:我们报告了磺酰胺异香豆素的单晶到单晶(SCSC)光二聚化。当重结晶时,该材料形成与中心对称相关的超分子二聚体,其通过分子形状和羧基中心点中心点中心点羧基接触的互补特征组装。尽管存在两部分全分子疾病,但该规定的基序仍然存在。每个无序分量都涉及一组独特的氢键相互作用,即NH中心点中心点中心点O = C与NH中心点中心点中心点O = S沿氢的[111]和[110]方向传播。水晶。尽管观察到紊乱,但该超分子二聚体的整体识别图保持完整,有效促进了共面的头对尾对齐,相邻C = C组之间的间距为3.4-4.1埃。使用尾部辐照技术的UV照明研究通过SCSC转换以定量收率生产了一种光二聚体产品。

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