Abstract of Crystal Research and Technology 34 (1999) 527

Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 527 - Abstract -

M. Biedermann, H. Hartung, J. Klunker, W. Schaefer

Institut für Physikalische Chemie, Martin-Luther-Universitaet Halle-Wittenberg, D-06099 Halle, Germany

Crystal Structure of N²,N²-Dimethylacetamidinium N,N-Dimethylcarbamate

The title compound crystallizes in the monoclinic space group P2 1 /c with four formula units in a unit cell of dimensions a = 10.814(2), b = 8.400(2), c = 11.398(4) A, beta = 110.86(2)°, V = 967.5(5) A³. The crystal structure is characterized by almost exactly planar [Me₂NC(NH₂)Me]⁺cations and [O₂CNMe₂ ]^- anions which are approximately perpendicular oriented to one another. The amidine N¹–C and N²–C bond lengths are significantly different (1.341(7) and 1.292(7) A, respectively) but the C–O distances of the carbamate anion are equal within experimental error (1.263(6) and 1.256(6) A). An essential feature of the crystal structure are N–H ---O hydrogen bonds between cations and anions.

Keywords: crystal structure, molecular structure, X-ray analysis, amidinium carbamate, hydrogen bonds

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