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Structure-Property Relations and Polymorphism in Compressed Methylamines

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The structures of a series of the simplest aliphatic amines determined at high pressure by single crystal X-ray diffraction reveal systematic structure property relations involving intermolecular interactions and molecular symmetries. Five new polymorphs have been found: one of methylamine (phase II, space group Fdd2), two of dimethylamine (phase I, space group C2/c and phase II, P2(1)/c), and two of trimethylamine (phase II, space group P2(1)/n and phase III, P2(1)/m). The methylarnine and dimethylamine molecules are arranged according to the NH center dot center dot center dot N hydrogen bonds. The phase diagrams of methylamines have been outlined up to 6 GPa.

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