CRYSTAL-STRUCTURES OF THE HYDRATED DISODIUM AND PARAQUAT SALTS OF 1,8-DISULFONATO-3,4,5,6-ACRIDINETETRACARBOXYLIC ACID

Two hydrated salts of 1,8-disulfonato-3,4,5,6-acridinetetracarboxylic acid, H2L, have been characterized by single-crystal X-ray analysis. C ompound 1, Na2L . 91/2H(2)O, crystallizes in the monoclinic space grou p C2/c with a = 42.005(1), b = 6.838(1), c = 23.807 (1) Angstrom, beta = 122.71 (1)degrees, and Z = 8. Compound 2, (paraquat)L . 2H(2)O, bel ongs to the triclinic space group P (1) over bar with a = 9.940(1), b = 11.543(1), c = 14.033(1) Angstrom, alpha = 105.45(1), beta = 95.82(1 ), gamma = 100.14(1)degrees and and Z = 2. All four carboxyl groups in the 3,4,5,6-tetracarboxyacridine-1,8-disulfonate dianion L2- are un-i onized. In 1 the distorted octahedrally coordinated sodium cations, th e anions, and the lattice water molecules are joined together by hydro gen bonds to generate a three-dimensional network. In the crystal stru cture of 2, a host framework composed of L2- ions and water molecules accommodate the paraquat dications within two channel systems running parallel to the a and b axes.