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Supramolecular isomerism in the hydrogen-bonded network of (5R,10R)-3,8-dihydroxy-5,10-diethoxy-5,10-dihydrochromeno[5,4,3-cde]chromene monohydrate
Authors:Jian-Zhong Wu  Long Lin  Ying Yu  Xia Wan  Xia Yin
Affiliation:(1) Department of Chemistry, South China Normal University, Guangzhou, 510631, China
Abstract:A new compound (5R, 10R)-3,8-dihydroxy-5,10-diethoxy-5,10-dihydrochromeno[5,4,3-cde]chromene monohydrate was obtained from 3,4-dihydroxybenzaldehyde in aerobic basic aqueous ethanol solution in the presence of manganese chloride and triethylamine and crystallized in orthorhombic P212121 space group (denoted as 1). When 1 was recrystallized from aqueous methanol, it was transformed to another crystal (2) with the same composition but in P21/n space group. The drastic difference in the extensive hydrogen bond network makes 1 a 3D and 2 a 2D infinite supramolecular structure, respectively.
Keywords:(5R,10R)-3,8-dihydroxy-5,10-diethox-5,10-dihydrochromeno[5,4,3-cde]chromene  Crystal structure  Hydrogen bond  Supramolecular isomerism
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