Crystal structure of tetramethylammonium iodate dihydrate

Tetramethylammonium iodate dihydrate N(CH3)(4)IO3 . 2H(2)O crystallizes in the orthorhombic system (space group Pna2(1)). The unit-cell parameters are as follows: a = 16.890(3), b = 6.2100(12), and c = 9.596(2) Angstrom; Z= 4 ; and P-calcd = 1.881 g/cm(3). The bond lengths in the iodate group are I-O (1)= 1.807(9): I-O(2)= 1.773(9), and I-O(3) = 1.776(4) Angstrom. The distan ces in the tetramethylammonium cation are N-C(1) = 1.509(8), N-C(2)= 1.53(2 ), N-C(3)= 1.49(2), and N-C(4)= 1.508(8) A. Water molecules form hydrogen b onds with the O(1) and O(2) atoms of the iodate group. In addition to the c ovalent bonds with the nearest oxygen atoms, the iodine atom forms secondar y bonds with the oxygen atoms of water molecules. The iodate groups are int erlinked to each other by hydrogen bonds of the water molecules to form puc kered layers. The tetramethylammonium cations are situated between these la yers.