
TY  - JOUR
A1  - Smith, Graham 
A1  - Pascoe, Catherine E. 
A1  - Kennard, Colin H. L. 
A1  - Byriel, Karl A. 
T1  - Molecular Adducts of 2,6-Diaminopyridine with Nitro-Substituted Aromatic Carboxylic Acids and the Crystal Structure of the 1 : 1 Adduct of 2,6-Diaminopyridine with 2-Nitrobenzoic Acid
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1998
VL  - 52
IS  - 1
SP  - 71
EP  - 74
KW  - 
UR  - https://doi.org/10.1071/C98140 
N2  - The 1 : 1 adducts of 2,6-diaminopyridine (2,6-dap) with a series of nitro-substituted aromatic carboxylic acids have been prepared and the crystal structure of one of these, with 2-nitrobenzoic acid (2-nba), &#91;(2,6-dap)+ (2-nba)-&#93; has been determined by X-ray crystallography and refined to a residual R 0&#183;034 for 655 observed reflections. Crystals are monoclinic, space group P 21/c, with four molecules in a cell of dimensions a 7&#183;376(2), b 22&#183;837(3), c 7&#183;716(2) &#197;, &#946; 90&#183;01(2)&#176;. The structure involves proton transfer with the resulting pyridinium proton and an amine proton combining with the carboxyl oxygens of the 2-nba molecule in a primary cyclic hydrogen-bonding association. Additional interactions, involving all the remaining amine protons of 2,6-dap with both carboxyl oxygens and one nitro oxygen of 2-nba, complete a chain polymer structure. All other members of this series have been confirmed by infrared spectroscopy as proton transfer adducts. 
ER  -

