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Graphene-like nets of hydrogen-bonded water mol-ecules in the dihydrate of 2-[(2-ammonio-eth-yl)amino]-acetate and the structure of its anhydrous hydro-iodide salt

Artikel i vetenskaplig tidskrift
Författare Tove Wiklund
Christine J. McKenzie
Anders Lennartson
Publicerad i Acta Crystallographica Section C: Crystal Structure Communications
Volym 66
ISSN 01082701
Publiceringsår 2010
Publicerad vid
Språk en
Ämneskategorier Kemi

Sammanfattning

2-[(2-Ammonio-eth-yl)amino]-acetate dihydrate, better known as N-(2-amino-eth-yl)glycine dihydrate, C 4 H 10 N 2 O 2 ·2H 2 O, (I), crystallizes as a three-dimensional hydrogen-bonded network. Amino acid mol-ecules form layers in the ac plane separated by layers of water mol-ecules, which form a hydrogen-bonded two-dimensional net composed of fused six-membered rings having boat conformations. The crystal structure of the corresponding hydro-iodide salt, namely 2-[(2-ammonio-eth-yl)ammonio]-acetate iodide, C 4 H 11 N 2 O 2 + ·I - , (II), has also been determined. The structure of (II) does not accommodate any solvent water mol-ecules, and displays stacks of amino acid mol-ecules parallel to the a axis, with iodide ions located in channels, resulting in an overall three-dimensional hydrogen-bonded network structure. N-(2-Amino-eth-yl)glycine is a mol-ecule of considerable bio-logical inter-est, since its polyamide derivative forms the backbone in the DNA mimic peptide nucleic acid (PNA). © 2010 International Union of Crystallography.

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