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- W2035262179 abstract "The title compound, betaine 0.77-perhydrate 0.23-hydrate, (CH3)3N(+)CH2COO(-)·0.77H2O2·0.23H2O, crystallizes in the orthorhombic noncentrosymmetric space group Pca2(1). Chiral molecules of hydrogen peroxide are positionally disordered with water molecules in a ratio of 0.77:0.23. Betaine, 2-(trimethylazaniumyl)acetate, preserves its zwitterionic state, with a positively charged ammonium group and a negatively charged carboxylate group. The molecular conformation of betaine here differs from the conformations of both anhydrous betaine and its hydrate, mainly in the orientation of the carboxylate group with respect to the C-C-N skeleton. Hydrogen peroxide is linked via two hydrogen bonds to carboxylate groups, forming infinite chains along the crystallographic a axis, which are very similar to those in the crystal structure of betaine hydrate. The present work contributes to the understanding of the structure-forming factors for amino acid perhydrates, which are presently attracting much attention. A correlation is suggested between the ratio of amino acid zwitterions and hydrogen peroxide in the unit cell and the structural motifs present in the crystal structures of all currently known amino acids perhydrates. This can help to classify the crystal structures of amino acid perhydrates and to design new crystal structures." @default.
- W2035262179 created "2016-06-24" @default.
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- W2035262179 date "2013-03-06" @default.
- W2035262179 modified "2023-10-07" @default.
- W2035262179 title "Betaine 0.77-perhydrate 0.23-hydrate and common structural motifs in crystals of amino acid perhydrates" @default.
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- W2035262179 doi "https://doi.org/10.1107/s0108270113005386" @default.
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