Hydrogen bonding and π-π stacking in two daidzein derivatives
Titel:
Hydrogen bonding and π-π stacking in two daidzein derivatives
Auteur:
Zhang, Zun-Ting Cheng, Xin-Li
Verschenen in:
Journal of coordination chemistry
Paginering:
Jaargang 60 (2007) nr. 10 pagina's 1111-1119
Jaar:
2007
Inhoud:
Two daidzein derivatives, hexaaquamagnesium(II) bis(7,4'-dimethoxyisoflavone-3'-sulfonate) octahydrate (1) and ammonium, diethylamine bis(7,4'-diethoxyisoflavone-3'-sulfonate)pentahydrate (2) were determined by X-ray diffraction analysis. Crystallographic data for 1: monoclinic, P21/c, a = 18.499(7) Å, b = 7.337(3) Å, c = 18.232(6) Å, β = 115.254(4)°, V = 2237.8(1) Å3, Z = 2. Data for 2: triclinic, Pī, a = 11.059(3) Å, b = 15.172(4) Å, c = 15.304(4) Å, α = 98.624(3)°, β = 108.438(4)°, γ = 92.752(4)°, V = 2395.9(1) Å3, Z = 2. The anions of compound 1 have one conformation and those of compound 2 have two conformations. In 1 and 2, classical hydrogen bonds lead to the formation of hydrophilic regions, columns of the isoflavone moieties form the hydrophobic regions by π-π stacking; with the sulfonate bridging the two regions as well as the inorganic and organic components a three-dimensional supramolecular structure is generated in both systems.
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