Ammonium violurate: a compact structure with extensive hydrogen bonding in three dimensions
摘要:
The title compound [ systematic name: ammonium pyrimidine2,4- 5,6(1H, 3H)-tetrone 5-oximate], NH4 (+) center dot C4H2N3O4-, crystallizes from water in the triclinic space group P (1) over bar and is isomorphous with a known rubidium complex [ Gillier ( 1965). Bull. Soc. Chim. Fr. pp. 2373 - 2384]. The principal feature of the structure is hydrogen bonding; each ammonium H atom acts as a bifurcated donor and three of the four violurate O atoms are bifurcated acceptors, with the fourth acting as a trifurcated acceptor. The pattern of hydrogen bonding around the cation is very similar to the rubidium coordination environment in the related structure. The violurate anions pack as hydrogen- bonded crinkled tapes, which are linked and separated by the ammonium cations to give a compact threedimensional structure.