Redetermination of para-aminopyridine (fampridine, EL-970) at 150 K
Anderson, Frankie P. and Gallagher, John F. and Kenny, Peter T.M. and Lough, Alan J. (2005) Redetermination of para-aminopyridine (fampridine, EL-970) at 150 K. Acta Crystallographica Section E, 61 (5). pp. 1350-1353. ISSN 1600-5368
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The structure of fampridine (EL-970) or 4-aminopyridine, C₅H₆N₂, has been redetermined at 150 K. The room-temperature structure has been reported previously [Chao & Schempp (1977). Acta Cryst. B33, 1557-1564]. Pyramidalization at the amine N atom occurs in fampridine, with the N atom 0.133 (11) Å from the plane of the three C/H/H atoms to which it is bonded; the interplanar angle between the pyridyl ring and NH2 group is 21 (2)°. Aggregation in the solid state occurs by N-H...N and N-H...[pi](pyridine) interactions with N...N and N...[pi](centroid) distances of 2.9829 (18) and 3.3954 (15) Å, respectively; a C-H...[pi](pyridine) contact completes the intermolecular interactions [C...[pi](centroid) = 3.6360 (16) Å].
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