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Crystal Structure of N 2 ,N 2 ‐Dimethylacetamidinium N,N‐Dimethylcarbamate
Author(s) -
Biedermann M.,
Hartung H.,
Klunker J.,
Schäfer W.
Publication year - 1999
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(199904)34:4<527::aid-crat527>3.0.co;2-e
Subject(s) - monoclinic crystal system , crystallography , crystal structure , amidine , chemistry , hydrogen bond , group (periodic table) , bond length , crystal (programming language) , unit (ring theory) , ion , molecule , stereochemistry , mathematics , mathematics education , organic chemistry , computer science , programming language
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, β = 110.86(2)°, V = 967.5(5) A 3 . The crystal structure is characterized by almost exactly planar [Me 2 NC(NH 2 )Me] + cations and [O 2 CNMe 2 ] ‐ anions which are approximately perpendicular oriented to one another. The amidine N 1 —C and N 2 —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.