HYDROGEN-BONDING IN SOLID MORPHOLINIUM 2,4-DINITROPHENOLATE

The structure of morpholinium 2,4-dinitrophenolate has been determined by X-ray diffraction methods. The crystals are monoclinic, space grou p P2(1)/c, with a = 9.902(2), b = 7.174(2), c = 17.578(3) Angstrom and beta = 99.89 degrees; Z = 4; final R = 0.034 for 1203 independent ref lections. The morpholinium and 2,4-dinitrophenolate moieties are linke d by hydrogen bonds N(3)(+)-H(4) ... O(1)(-) of 2.723(3) Angstrom and N(3)+-H(5) ... O(1)(-) of 2.752(3) Angstrom. The ionic character of th e hydrogen bond was cofirmed by IR and UV spectra. Spectral characteri stics of the complex are compared with related properties of 2,4-dinit rophenolates of dimethyloamine, pyrrolidine and tetramethylammonium 2, 4-dinitrophenolate.