
TY  - JOUR
A1  - Smith, Graham 
A1  - Kennard, Colin H. L. 
T1  - The Crystal and Molecular Structure of the 1:1 Adduct Hydrate of Pyrazine-2,3-dicarboxylic Acid with 1,1-Diethylurea
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2001
VL  - 53
IS  - 12
SP  - 999
EP  - 1001
KW  - X-ray crystal structure; diethylurea; carboxylic acids; pyrazines.
UR  - https://doi.org/10.1071/CH00150 
N2  - The adduct hydrate of 1,1-diethylurea with pyrazine-2,3-dicarboxylic acid, &#91;(C6H4N2O4)(C5H12N2O)&#93;.H2O has been prepared and characterized using low-temperature single-crystal X-ray diffraction methods. A primary asymmetric cyclic hydrogen-bonding interaction, similar to those found in other adducts of 1,1-diethylurea with the nitro-substituted aromatic acids, was found between the amide group of the substituted urea and one carboxylic acid group of the acid. Further peripheral hydrogen-bonding associations involving both the f irst and the second carboxylic acid groups, urea and the lattice water molecule result in a ribbon polymer structure. 
ER  -

